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rt: Move generic implementation from sysdeps/pthread to rt

Browse Source 
The pthread-based implementation is the generic one.  Replacing
the stubs makes it clear that they do not have to be adjusted for
the libpthread move.

Result of:

    git mv -f sysdeps/pthread/aio_misc.h sysdeps/generic/
    git mv sysdeps/pthread/timer_routines.c sysdeps/htl/
    git mv -f sysdeps/pthread/{aio,lio,timer}_*.c rt/

Followed by manual adjustment of the #include paths in
sysdeps/unix/sysv/linux/wordsize-64, and a move of the version
definitions formerly in sysdeps/pthread/Versions.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer 2021-06-22 09:50:27 +02:00
parent ae830b2d9f
commit daa3fc9bff
44 changed files with 2019 additions and 2546 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
rt/Versions
View File

@ -47,6 +47,10 @@ librt {
mq_timedsend;
mq_unlink;
}
GLIBC_2.4 {
lio_listio;
lio_listio64;
}
GLIBC_2.7 {
__mq_open_2;
}

129
rt/aio_cancel.c
View File

@ -1,6 +1,7 @@
/* Cancel requests associated with given file descriptor. Stub version.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
/* Cancel requests associated with given file descriptor.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -22,21 +23,135 @@
we want to avoid code duplication by using aliases. But gcc sees
the different parameter lists and prints a warning. We define here
a function so that aio_cancel64 has no prototype. */
#ifndef aio_cancel
#define aio_cancel64 XXX
#include <aio.h>
/* And undo the hack. */
#undef aio_cancel64
#endif
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <aio_misc.h>
int
aio_cancel (int fildes, struct aiocb *aiocbp)
{
__set_errno (ENOSYS);
return -1;
struct requestlist *req = NULL;
int result = AIO_ALLDONE;
/* If fildes is invalid, error. */
if (fcntl (fildes, F_GETFL) < 0)
{
__set_errno (EBADF);
return -1;
}
/* Request the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
/* We are asked to cancel a specific AIO request. */
if (aiocbp != NULL)
{
/* If the AIO request is not for this descriptor it has no value
to look for the request block. */
if (aiocbp->aio_fildes != fildes)
{
pthread_mutex_unlock (&__aio_requests_mutex);
__set_errno (EINVAL);
return -1;
}
else if (aiocbp->__error_code == EINPROGRESS)
{
struct requestlist *last = NULL;
req = __aio_find_req_fd (fildes);
if (req == NULL)
{
not_found:
pthread_mutex_unlock (&__aio_requests_mutex);
__set_errno (EINVAL);
return -1;
}
while (req->aiocbp != (aiocb_union *) aiocbp)
{
last = req;
req = req->next_prio;
if (req == NULL)
goto not_found;
}
/* Don't remove the entry if a thread is already working on it. */
if (req->running == allocated)
{
result = AIO_NOTCANCELED;
req = NULL;
}
else
{
/* We can remove the entry. */
__aio_remove_request (last, req, 0);
result = AIO_CANCELED;
req->next_prio = NULL;
}
}
}
else
{
/* Find the beginning of the list of all requests for this
desriptor. */
req = __aio_find_req_fd (fildes);
/* If any request is worked on by a thread it must be the first.
So either we can delete all requests or all but the first. */
if (req != NULL)
{
if (req->running == allocated)
{
struct requestlist *old = req;
req = req->next_prio;
old->next_prio = NULL;
result = AIO_NOTCANCELED;
if (req != NULL)
__aio_remove_request (old, req, 1);
}
else
{
result = AIO_CANCELED;
/* We can remove the entry. */
__aio_remove_request (NULL, req, 1);
}
}
}
/* Mark requests as canceled and send signal. */
while (req != NULL)
{
struct requestlist *old = req;
assert (req->running == yes || req->running == queued);
req->aiocbp->aiocb.__error_code = ECANCELED;
req->aiocbp->aiocb.__return_value = -1;
__aio_notify (req);
req = req->next_prio;
__aio_free_request (old);
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
return result;
}
#ifndef aio_cancel
weak_alias (aio_cancel, aio_cancel64)
stub_warning (aio_cancel)
stub_warning (aio_cancel64)
#endif

12
rt/aio_error.c
View File

@ -28,11 +28,21 @@
/* And undo the hack. */
#undef aio_error64
#include <aio_misc.h>
int
aio_error (const struct aiocb *aiocbp)
{
return aiocbp->__error_code;
int ret;
/* Acquire the mutex to make sure all operations for this request are
complete. */
pthread_mutex_lock(&__aio_requests_mutex);
ret = aiocbp->__error_code;
pthread_mutex_unlock(&__aio_requests_mutex);
return ret;
}
weak_alias (aio_error, aio_error64)

26
rt/aio_fsync.c
View File

@ -1,6 +1,7 @@
/* Synchronize I/O in given file descriptor. Stub version.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
/* Synchronize I/O in given file descriptor.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -26,24 +27,31 @@
#include <aio.h>
/* And undo the hack. */
#undef aio_fsync64
#include <errno.h>
#include <fcntl.h>
#include <aio_misc.h>
int
aio_fsync (int op, struct aiocb *aiocbp)
{
if (op != O_SYNC && op != O_DSYNC)
if (op != O_DSYNC && __builtin_expect (op != O_SYNC, 0))
{
__set_errno (EINVAL);
return -1;
}
__set_errno (ENOSYS);
return -1;
/* Verify that this is an open file descriptor. */
if (__glibc_unlikely (fcntl (aiocbp->aio_fildes, F_GETFL) == -1))
{
__set_errno (EBADF);
return -1;
}
return (__aio_enqueue_request ((aiocb_union *) aiocbp,
op == O_SYNC ? LIO_SYNC : LIO_DSYNC) == NULL
? -1 : 0);
}
weak_alias (aio_fsync, aio_fsync64)
stub_warning (aio_fsync)
stub_warning (aio_fsync64)

699
rt/aio_misc.c
View File

@ -1,6 +1,7 @@
/* Handle general operations. Stub version.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
/* Handle general operations.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -17,12 +18,704 @@
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <aio_misc.h>
/* This file is for internal code needed by the aio_* implementation. */
#ifndef aio_create_helper_thread
# define aio_create_helper_thread __aio_create_helper_thread
extern inline int
__aio_create_helper_thread (pthread_t *threadp, void *(*tf) (void *), void *arg)
{
pthread_attr_t attr;
/* Make sure the thread is created detached. */
pthread_attr_init (&attr);
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
int ret = pthread_create (threadp, &attr, tf, arg);
(void) pthread_attr_destroy (&attr);
return ret;
}
#endif
static void add_request_to_runlist (struct requestlist *newrequest);
/* Pool of request list entries. */
static struct requestlist **pool;
/* Number of total and allocated pool entries. */
static size_t pool_max_size;
static size_t pool_size;
/* We implement a two dimensional array but allocate each row separately.
The macro below determines how many entries should be used per row.
It should better be a power of two. */
#define ENTRIES_PER_ROW 32
/* How many rows we allocate at once. */
#define ROWS_STEP 8
/* List of available entries. */
static struct requestlist *freelist;
/* List of request waiting to be processed. */
static struct requestlist *runlist;
/* Structure list of all currently processed requests. */
static struct requestlist *requests;
/* Number of threads currently running. */
static int nthreads;
/* Number of threads waiting for work to arrive. */
static int idle_thread_count;
/* These are the values used to optimize the use of AIO. The user can
overwrite them by using the `aio_init' function. */
static struct aioinit optim =
{
20, /* int aio_threads; Maximal number of threads. */
64, /* int aio_num; Number of expected simultaneous requests. */
0,
0,
0,
0,
1,
0
};
/* Since the list is global we need a mutex protecting it. */
pthread_mutex_t __aio_requests_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
/* When you add a request to the list and there are idle threads present,
you signal this condition variable. When a thread finishes work, it waits
on this condition variable for a time before it actually exits. */
pthread_cond_t __aio_new_request_notification = PTHREAD_COND_INITIALIZER;
/* Functions to handle request list pool. */
static struct requestlist *
get_elem (void)
{
struct requestlist *result;
if (freelist == NULL)
{
struct requestlist *new_row;
int cnt;
assert (sizeof (struct aiocb) == sizeof (struct aiocb64));
if (pool_size + 1 >= pool_max_size)
{
size_t new_max_size = pool_max_size + ROWS_STEP;
struct requestlist **new_tab;
new_tab = (struct requestlist **)
realloc (pool, new_max_size * sizeof (struct requestlist *));
if (new_tab == NULL)
return NULL;
pool_max_size = new_max_size;
pool = new_tab;
}
/* Allocate the new row. */
cnt = pool_size == 0 ? optim.aio_num : ENTRIES_PER_ROW;
new_row = (struct requestlist *) calloc (cnt,
sizeof (struct requestlist));
if (new_row == NULL)
return NULL;
pool[pool_size++] = new_row;
/* Put all the new entries in the freelist. */
do
{
new_row->next_prio = freelist;
freelist = new_row++;
}
while (--cnt > 0);
}
result = freelist;
freelist = freelist->next_prio;
return result;
}
void
__aio_free_request (struct requestlist *elem)
{
elem->running = no;
elem->next_prio = freelist;
freelist = elem;
}
struct requestlist *
__aio_find_req (aiocb_union *elem)
{
struct requestlist *runp = requests;
int fildes = elem->aiocb.aio_fildes;
while (runp != NULL && runp->aiocbp->aiocb.aio_fildes < fildes)
runp = runp->next_fd;
if (runp != NULL)
{
if (runp->aiocbp->aiocb.aio_fildes != fildes)
runp = NULL;
else
while (runp != NULL && runp->aiocbp != elem)
runp = runp->next_prio;
}
return runp;
}
struct requestlist *
__aio_find_req_fd (int fildes)
{
struct requestlist *runp = requests;
while (runp != NULL && runp->aiocbp->aiocb.aio_fildes < fildes)
runp = runp->next_fd;
return (runp != NULL && runp->aiocbp->aiocb.aio_fildes == fildes
? runp : NULL);
}
void
__aio_remove_request (struct requestlist *last, struct requestlist *req,
int all)
{
assert (req->running == yes || req->running == queued
|| req->running == done);
if (last != NULL)
last->next_prio = all ? NULL : req->next_prio;
else
{
if (all || req->next_prio == NULL)
{
if (req->last_fd != NULL)
req->last_fd->next_fd = req->next_fd;
else
requests = req->next_fd;
if (req->next_fd != NULL)
req->next_fd->last_fd = req->last_fd;
}
else
{
if (req->last_fd != NULL)
req->last_fd->next_fd = req->next_prio;
else
requests = req->next_prio;
if (req->next_fd != NULL)
req->next_fd->last_fd = req->next_prio;
req->next_prio->last_fd = req->last_fd;
req->next_prio->next_fd = req->next_fd;
/* Mark this entry as runnable. */
req->next_prio->running = yes;
}
if (req->running == yes)
{
struct requestlist *runp = runlist;
last = NULL;
while (runp != NULL)
{
if (runp == req)
{
if (last == NULL)
runlist = runp->next_run;
else
last->next_run = runp->next_run;
break;
}
last = runp;
runp = runp->next_run;
}
}
}
}
/* The thread handler. */
static void *handle_fildes_io (void *arg);
/* User optimization. */
void
__aio_init (const struct aioinit *init)
{
/* Get the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
/* Only allow writing new values if the table is not yet allocated. */
if (pool == NULL)
{
optim.aio_threads = init->aio_threads < 1 ? 1 : init->aio_threads;
assert (powerof2 (ENTRIES_PER_ROW));
optim.aio_num = (init->aio_num < ENTRIES_PER_ROW
? ENTRIES_PER_ROW
: init->aio_num & ~(ENTRIES_PER_ROW - 1));
}
if (init->aio_idle_time != 0)
optim.aio_idle_time = init->aio_idle_time;
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
}
weak_alias (__aio_init, aio_init)
/* The main function of the async I/O handling. It enqueues requests
and if necessary starts and handles threads. */
struct requestlist *
__aio_enqueue_request (aiocb_union *aiocbp, int operation)
{
int result = 0;
int policy, prio;
struct sched_param param;
struct requestlist *last, *runp, *newp;
int running = no;
if (operation == LIO_SYNC || operation == LIO_DSYNC)
aiocbp->aiocb.aio_reqprio = 0;
else if (aiocbp->aiocb.aio_reqprio < 0
#ifdef AIO_PRIO_DELTA_MAX
|| aiocbp->aiocb.aio_reqprio > AIO_PRIO_DELTA_MAX
#endif
)
{
/* Invalid priority value. */
__set_errno (EINVAL);
aiocbp->aiocb.__error_code = EINVAL;
aiocbp->aiocb.__return_value = -1;
return NULL;
}
/* Compute priority for this request. */
pthread_getschedparam (pthread_self (), &policy, &param);
prio = param.sched_priority - aiocbp->aiocb.aio_reqprio;
/* Get the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
last = NULL;
runp = requests;
/* First look whether the current file descriptor is currently
worked with. */
while (runp != NULL
&& runp->aiocbp->aiocb.aio_fildes < aiocbp->aiocb.aio_fildes)
{
last = runp;
runp = runp->next_fd;
}
/* Get a new element for the waiting list. */
newp = get_elem ();
if (newp == NULL)
{
pthread_mutex_unlock (&__aio_requests_mutex);
__set_errno (EAGAIN);
return NULL;
}
newp->aiocbp = aiocbp;
newp->waiting = NULL;
aiocbp->aiocb.__abs_prio = prio;
aiocbp->aiocb.__policy = policy;
aiocbp->aiocb.aio_lio_opcode = operation;
aiocbp->aiocb.__error_code = EINPROGRESS;
aiocbp->aiocb.__return_value = 0;
if (runp != NULL
&& runp->aiocbp->aiocb.aio_fildes == aiocbp->aiocb.aio_fildes)
{
/* The current file descriptor is worked on. It makes no sense
to start another thread since this new thread would fight
with the running thread for the resources. But we also cannot
say that the thread processing this desriptor shall immediately
after finishing the current job process this request if there
are other threads in the running queue which have a higher
priority. */
/* Simply enqueue it after the running one according to the
priority. */
last = NULL;
while (runp->next_prio != NULL
&& runp->next_prio->aiocbp->aiocb.__abs_prio >= prio)
{
last = runp;
runp = runp->next_prio;
}
newp->next_prio = runp->next_prio;
runp->next_prio = newp;
running = queued;
}
else
{
running = yes;
/* Enqueue this request for a new descriptor. */
if (last == NULL)
{
newp->last_fd = NULL;
newp->next_fd = requests;
if (requests != NULL)
requests->last_fd = newp;
requests = newp;
}
else
{
newp->next_fd = last->next_fd;
newp->last_fd = last;
last->next_fd = newp;
if (newp->next_fd != NULL)
newp->next_fd->last_fd = newp;
}
newp->next_prio = NULL;
last = NULL;
}
if (running == yes)
{
/* We try to create a new thread for this file descriptor. The
function which gets called will handle all available requests
for this descriptor and when all are processed it will
terminate.
If no new thread can be created or if the specified limit of
threads for AIO is reached we queue the request. */
/* See if we need to and are able to create a thread. */
if (nthreads < optim.aio_threads && idle_thread_count == 0)
{
pthread_t thid;
running = newp->running = allocated;
/* Now try to start a thread. */
result = aio_create_helper_thread (&thid, handle_fildes_io, newp);
if (result == 0)
/* We managed to enqueue the request. All errors which can
happen now can be recognized by calls to `aio_return' and
`aio_error'. */
++nthreads;
else
{
/* Reset the running flag. The new request is not running. */
running = newp->running = yes;
if (nthreads == 0)
{
/* We cannot create a thread in the moment and there is
also no thread running. This is a problem. `errno' is
set to EAGAIN if this is only a temporary problem. */
__aio_remove_request (last, newp, 0);
}
else
result = 0;
}
}
}
/* Enqueue the request in the run queue if it is not yet running. */
if (running == yes && result == 0)
{
add_request_to_runlist (newp);
/* If there is a thread waiting for work, then let it know that we
have just given it something to do. */
if (idle_thread_count > 0)
pthread_cond_signal (&__aio_new_request_notification);
}
if (result == 0)
newp->running = running;
else
{
/* Something went wrong. */
__aio_free_request (newp);
aiocbp->aiocb.__error_code = result;
__set_errno (result);
newp = NULL;
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
return newp;
}
static void *
handle_fildes_io (void *arg)
{
pthread_t self = pthread_self ();
struct sched_param param;
struct requestlist *runp = (struct requestlist *) arg;
aiocb_union *aiocbp;
int policy;
int fildes;
pthread_getschedparam (self, &policy, &param);
do
{
/* If runp is NULL, then we were created to service the work queue
in general, not to handle any particular request. In that case we
skip the "do work" stuff on the first pass, and go directly to the
"get work off the work queue" part of this loop, which is near the
end. */
if (runp == NULL)
pthread_mutex_lock (&__aio_requests_mutex);
else
{
/* Hopefully this request is marked as running. */
assert (runp->running == allocated);
/* Update our variables. */
aiocbp = runp->aiocbp;
fildes = aiocbp->aiocb.aio_fildes;
/* Change the priority to the requested value (if necessary). */
if (aiocbp->aiocb.__abs_prio != param.sched_priority
|| aiocbp->aiocb.__policy != policy)
{
param.sched_priority = aiocbp->aiocb.__abs_prio;
policy = aiocbp->aiocb.__policy;
pthread_setschedparam (self, policy, &param);
}
/* Process request pointed to by RUNP. We must not be disturbed
by signals. */
if ((aiocbp->aiocb.aio_lio_opcode & 127) == LIO_READ)
{
if (sizeof (off_t) != sizeof (off64_t)
&& aiocbp->aiocb.aio_lio_opcode & 128)
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (__pread64 (fildes, (void *)
aiocbp->aiocb64.aio_buf,
aiocbp->aiocb64.aio_nbytes,
aiocbp->aiocb64.aio_offset));
else
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (__libc_pread (fildes,
(void *)
aiocbp->aiocb.aio_buf,
aiocbp->aiocb.aio_nbytes,
aiocbp->aiocb.aio_offset));
if (aiocbp->aiocb.__return_value == -1 && errno == ESPIPE)
/* The Linux kernel is different from others. It returns
ESPIPE if using pread on a socket. Other platforms
simply ignore the offset parameter and behave like
read. */
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (read (fildes,
(void *) aiocbp->aiocb64.aio_buf,
aiocbp->aiocb64.aio_nbytes));
}
else if ((aiocbp->aiocb.aio_lio_opcode & 127) == LIO_WRITE)
{
if (sizeof (off_t) != sizeof (off64_t)
&& aiocbp->aiocb.aio_lio_opcode & 128)
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (__pwrite64 (fildes, (const void *)
aiocbp->aiocb64.aio_buf,
aiocbp->aiocb64.aio_nbytes,
aiocbp->aiocb64.aio_offset));
else
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (__libc_pwrite (fildes, (const void *)
aiocbp->aiocb.aio_buf,
aiocbp->aiocb.aio_nbytes,
aiocbp->aiocb.aio_offset));
if (aiocbp->aiocb.__return_value == -1 && errno == ESPIPE)
/* The Linux kernel is different from others. It returns
ESPIPE if using pwrite on a socket. Other platforms
simply ignore the offset parameter and behave like
write. */
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (write (fildes,
(void *) aiocbp->aiocb64.aio_buf,
aiocbp->aiocb64.aio_nbytes));
}
else if (aiocbp->aiocb.aio_lio_opcode == LIO_DSYNC)
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (fdatasync (fildes));
else if (aiocbp->aiocb.aio_lio_opcode == LIO_SYNC)
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (fsync (fildes));
else
{
/* This is an invalid opcode. */
aiocbp->aiocb.__return_value = -1;
__set_errno (EINVAL);
}
/* Get the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
if (aiocbp->aiocb.__return_value == -1)
aiocbp->aiocb.__error_code = errno;
else
aiocbp->aiocb.__error_code = 0;
/* Send the signal to notify about finished processing of the
request. */
__aio_notify (runp);
/* For debugging purposes we reset the running flag of the
finished request. */
assert (runp->running == allocated);
runp->running = done;
/* Now dequeue the current request. */
__aio_remove_request (NULL, runp, 0);
if (runp->next_prio != NULL)
add_request_to_runlist (runp->next_prio);
/* Free the old element. */
__aio_free_request (runp);
}
runp = runlist;
/* If the runlist is empty, then we sleep for a while, waiting for
something to arrive in it. */
if (runp == NULL && optim.aio_idle_time >= 0)
{
struct timespec now;
struct timespec wakeup_time;
++idle_thread_count;
__clock_gettime (CLOCK_REALTIME, &now);
wakeup_time.tv_sec = now.tv_sec + optim.aio_idle_time;
wakeup_time.tv_nsec = now.tv_nsec;
if (wakeup_time.tv_nsec >= 1000000000)
{
wakeup_time.tv_nsec -= 1000000000;
++wakeup_time.tv_sec;
}
pthread_cond_timedwait (&__aio_new_request_notification,
&__aio_requests_mutex,
&wakeup_time);
--idle_thread_count;
runp = runlist;
}
if (runp == NULL)
--nthreads;
else
{
assert (runp->running == yes);
runp->running = allocated;
runlist = runp->next_run;
/* If we have a request to process, and there's still another in
the run list, then we need to either wake up or create a new
thread to service the request that is still in the run list. */
if (runlist != NULL)
{
/* There are at least two items in the work queue to work on.
If there are other idle threads, then we should wake them
up for these other work elements; otherwise, we should try
to create a new thread. */
if (idle_thread_count > 0)
pthread_cond_signal (&__aio_new_request_notification);
else if (nthreads < optim.aio_threads)
{
pthread_t thid;
pthread_attr_t attr;
/* Make sure the thread is created detached. */
pthread_attr_init (&attr);
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
/* Now try to start a thread. If we fail, no big deal,
because we know that there is at least one thread (us)
that is working on AIO operations. */
if (pthread_create (&thid, &attr, handle_fildes_io, NULL)
== 0)
++nthreads;
}
}
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
}
while (runp != NULL);
return NULL;
}
/* Free allocated resources. */
libc_freeres_fn (free_res)
{
size_t row;
for (row = 0; row < pool_max_size; ++row)
free (pool[row]);
free (pool);
}
/* Add newrequest to the runlist. The __abs_prio flag of newrequest must
be correctly set to do this. Also, you had better set newrequest's
"running" flag to "yes" before you release your lock or you'll throw an
assertion. */
static void
add_request_to_runlist (struct requestlist *newrequest)
{
int prio = newrequest->aiocbp->aiocb.__abs_prio;
struct requestlist *runp;
if (runlist == NULL || runlist->aiocbp->aiocb.__abs_prio < prio)
{
newrequest->next_run = runlist;
runlist = newrequest;
}
else
{
runp = runlist;
while (runp->next_run != NULL
&& runp->next_run->aiocbp->aiocb.__abs_prio >= prio)
runp = runp->next_run;
newrequest->next_run = runp->next_run;
runp->next_run = newrequest;
}
}

144
rt/aio_notify.c
View File

@ -1,6 +1,7 @@
/* Notify initiator of AIO request. Stub version.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
/* Notify initiator of AIO request.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -16,8 +17,141 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <errno.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <aio_misc.h>
#include <signal.h>
/* This file contains only internal functions used by
the particular aio_* implementation code. */
#ifndef aio_start_notify_thread
# define aio_start_notify_thread() do { } while (0)
#endif
struct notify_func
{
void (*func) (sigval_t);
sigval_t value;
};
static void *
notify_func_wrapper (void *arg)
{
aio_start_notify_thread ();
struct notify_func *const n = arg;
void (*func) (sigval_t) = n->func;
sigval_t value = n->value;
free (n);
(*func) (value);
return NULL;
}
int
__aio_notify_only (struct sigevent *sigev)
{
int result = 0;
/* Send the signal to notify about finished processing of the request. */
if (__glibc_unlikely (sigev->sigev_notify == SIGEV_THREAD))
{
/* We have to start a thread. */
pthread_t tid;
pthread_attr_t attr, *pattr;
pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
if (pattr == NULL)
{
pthread_attr_init (&attr);
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
pattr = &attr;
}
/* SIGEV may be freed as soon as we return, so we cannot let the
notification thread use that pointer. Even though a sigval_t is
only one word and the same size as a void *, we cannot just pass
the value through pthread_create as the argument and have the new
thread run the user's function directly, because on some machines
the calling convention for a union like sigval_t is different from
that for a pointer type like void *. */
struct notify_func *nf = malloc (sizeof *nf);
if (nf == NULL)
result = -1;
else
{
nf->func = sigev->sigev_notify_function;
nf->value = sigev->sigev_value;
if (pthread_create (&tid, pattr, notify_func_wrapper, nf) < 0)
{
free (nf);
result = -1;
}
}
}
else if (sigev->sigev_notify == SIGEV_SIGNAL)
{
/* We have to send a signal. */
#if _POSIX_REALTIME_SIGNALS > 0
/* Note that the standard gives us the option of using a plain
non-queuing signal here when SA_SIGINFO is not set for the signal. */
if (__aio_sigqueue (sigev->sigev_signo, sigev->sigev_value, getpid ())
< 0)
result = -1;
#else
/* There are no queued signals on this system at all. */
result = raise (sigev->sigev_signo);
#endif
}
return result;
}
void
__aio_notify (struct requestlist *req)
{
struct waitlist *waitlist;
struct aiocb *aiocbp = &req->aiocbp->aiocb;
if (__aio_notify_only (&aiocbp->aio_sigevent) != 0)
{
/* XXX What shall we do if already an error is set by
read/write/fsync? */
aiocbp->__error_code = errno;
aiocbp->__return_value = -1;
}
/* Now also notify possibly waiting threads. */
waitlist = req->waiting;
while (waitlist != NULL)
{
struct waitlist *next = waitlist->next;
if (waitlist->sigevp == NULL)
{
if (waitlist->result != NULL && aiocbp->__return_value == -1)
*waitlist->result = -1;
#ifdef DONT_NEED_AIO_MISC_COND
AIO_MISC_NOTIFY (waitlist);
#else
/* Decrement the counter. */
--*waitlist->counterp;
pthread_cond_signal (waitlist->cond);
#endif
}
else
/* This is part of an asynchronous `lio_listio' operation. If
this request is the last one, send the signal. */
if (--*waitlist->counterp == 0)
{
__aio_notify_only (waitlist->sigevp);
/* This is tricky. See lio_listio.c for the reason why
this works. */
free ((void *) waitlist->counterp);
}
waitlist = next;
}
}

18
rt/aio_read.c
View File

@ -1,6 +1,7 @@
/* Asynchronous read. Stub version.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
/* Asynchronous read.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -17,18 +18,13 @@
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <errno.h>
#ifdef BE_AIO64
#define aiocb aiocb64
#define aio_read aio_read64
#endif
#include <aio_misc.h>
int
aio_read (struct aiocb *aiocbp)
{
__set_errno (ENOSYS);
return -1;
return (__aio_enqueue_request ((aiocb_union *) aiocbp, LIO_READ) == NULL
? -1 : 0);
}
stub_warning (aio_read)

32
rt/aio_read64.c
View File

@ -1,2 +1,30 @@
#define BE_AIO64
#include <aio_read.c>
/* Asynchronous read, 64bit offset version.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <aio_misc.h>
int
aio_read64 (struct aiocb64 *aiocbp)
{
return (__aio_enqueue_request ((aiocb_union *) aiocbp, LIO_READ64) == NULL
? -1 : 0);
}

239
rt/aio_suspend.c
View File

@ -1,6 +1,7 @@
/* Suspend until termination of a requests. Stub version.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
/* Suspend until termination of a requests.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -27,18 +28,236 @@
/* And undo the hack. */
#undef aio_suspend64
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/time.h>
#include <libc-lock.h>
#include <aio_misc.h>
struct clparam
{
const struct aiocb *const *list;
struct waitlist *waitlist;
struct requestlist **requestlist;
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t *cond;
#endif
int nent;
};
static void
cleanup (void *arg)
{
#ifdef DONT_NEED_AIO_MISC_COND
/* Acquire the mutex. If pthread_cond_*wait is used this would
happen implicitly. */
pthread_mutex_lock (&__aio_requests_mutex);
#endif
const struct clparam *param = (const struct clparam *) arg;
/* Now remove the entry in the waiting list for all requests
which didn't terminate. */
int cnt = param->nent;
while (cnt-- > 0)
if (param->list[cnt] != NULL
&& param->list[cnt]->__error_code == EINPROGRESS)
{
struct waitlist **listp;
assert (param->requestlist[cnt] != NULL);
/* There is the chance that we cannot find our entry anymore. This
could happen if the request terminated and restarted again. */
listp = &param->requestlist[cnt]->waiting;
while (*listp != NULL && *listp != &param->waitlist[cnt])
listp = &(*listp)->next;
if (*listp != NULL)
*listp = (*listp)->next;
}
#ifndef DONT_NEED_AIO_MISC_COND
/* Release the conditional variable. */
(void) pthread_cond_destroy (param->cond);
#endif
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
}
#ifdef DONT_NEED_AIO_MISC_COND
static int
__attribute__ ((noinline))
do_aio_misc_wait (unsigned int *cntr, const struct __timespec64 *timeout)
{
int result = 0;
AIO_MISC_WAIT (result, *cntr, timeout, 1);
return result;
}
#endif
int
aio_suspend (const struct aiocb *const list[], int nent,
const struct timespec *timeout)
__aio_suspend_time64 (const struct aiocb *const list[], int nent,
const struct __timespec64 *timeout)
{
__set_errno (ENOSYS);
return -1;
}
weak_alias (aio_suspend, aio_suspend64)
if (__glibc_unlikely (nent < 0))
{
__set_errno (EINVAL);
return -1;
}
stub_warning (aio_suspend)
stub_warning (aio_suspend64)
struct waitlist waitlist[nent];
struct requestlist *requestlist[nent];
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
#endif
int cnt;
bool any = false;
int result = 0;
unsigned int cntr = 1;
/* Request the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
/* There is not yet a finished request. Signal the request that
we are working for it. */
for (cnt = 0; cnt < nent; ++cnt)
if (list[cnt] != NULL)
{
if (list[cnt]->__error_code == EINPROGRESS)
{
requestlist[cnt] = __aio_find_req ((aiocb_union *) list[cnt]);
if (requestlist[cnt] != NULL)
{
#ifndef DONT_NEED_AIO_MISC_COND
waitlist[cnt].cond = &cond;
#endif
waitlist[cnt].result = NULL;
waitlist[cnt].next = requestlist[cnt]->waiting;
waitlist[cnt].counterp = &cntr;
waitlist[cnt].sigevp = NULL;
requestlist[cnt]->waiting = &waitlist[cnt];
any = true;
}
else
/* We will never suspend. */
break;
}
else
/* We will never suspend. */
break;
}
struct __timespec64 ts;
if (timeout != NULL)
{
__clock_gettime64 (CLOCK_MONOTONIC, &ts);
ts.tv_sec += timeout->tv_sec;
ts.tv_nsec += timeout->tv_nsec;
if (ts.tv_nsec >= 1000000000)
{
ts.tv_nsec -= 1000000000;
ts.tv_sec++;
}
}
/* Only if none of the entries is NULL or finished to be wait. */
if (cnt == nent && any)
{
struct clparam clparam =
{
.list = list,
.waitlist = waitlist,
.requestlist = requestlist,
#ifndef DONT_NEED_AIO_MISC_COND
.cond = &cond,
#endif
.nent = nent
};
pthread_cleanup_push (cleanup, &clparam);
#ifdef DONT_NEED_AIO_MISC_COND
result = do_aio_misc_wait (&cntr, timeout == NULL ? NULL : &ts);
#else
struct timespec ts32 = valid_timespec64_to_timespec (ts);
result = pthread_cond_timedwait (&cond, &__aio_requests_mutex,
timeout == NULL ? NULL : &ts32);
#endif
pthread_cleanup_pop (0);
}
/* Now remove the entry in the waiting list for all requests
which didn't terminate. */
while (cnt-- > 0)
if (list[cnt] != NULL && list[cnt]->__error_code == EINPROGRESS)
{
struct waitlist **listp;
assert (requestlist[cnt] != NULL);
/* There is the chance that we cannot find our entry anymore. This
could happen if the request terminated and restarted again. */
listp = &requestlist[cnt]->waiting;
while (*listp != NULL && *listp != &waitlist[cnt])
listp = &(*listp)->next;
if (*listp != NULL)
*listp = (*listp)->next;
}
#ifndef DONT_NEED_AIO_MISC_COND
/* Release the conditional variable. */
if (__glibc_unlikely (pthread_cond_destroy (&cond) != 0))
/* This must never happen. */
abort ();
#endif
if (result != 0)
{
#ifndef DONT_NEED_AIO_MISC_COND
/* An error occurred. Possibly it's ETIMEDOUT. We have to translate
the timeout error report of `pthread_cond_timedwait' to the
form expected from `aio_suspend'. */
if (result == ETIMEDOUT)
__set_errno (EAGAIN);
else
#endif
__set_errno (result);
result = -1;
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
return result;
}
#if __TIMESIZE != 64
librt_hidden_def (__aio_suspend_time64)
int
__aio_suspend (const struct aiocb *const list[], int nent,
const struct timespec *timeout)
{
struct __timespec64 ts64;
if (timeout != NULL)
ts64 = valid_timespec_to_timespec64 (*timeout);
return __aio_suspend_time64 (list, nent, timeout != NULL ? &ts64 : NULL);
}
#endif
weak_alias (__aio_suspend, aio_suspend)
weak_alias (aio_suspend, aio_suspend64)

18
rt/aio_write.c
View File

@ -1,6 +1,7 @@
/* Asynchronous write. Stub version.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
/* Asynchronous write.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -17,18 +18,13 @@
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <errno.h>
#ifdef BE_AIO64
#define aiocb aiocb64
#define aio_write aio_write64
#endif
#include <aio_misc.h>
int
aio_write (struct aiocb *aiocbp)
{
__set_errno (ENOSYS);
return -1;
return (__aio_enqueue_request ((aiocb_union *) aiocbp, LIO_WRITE) == NULL
? -1 : 0);
}
stub_warning (aio_write)

32
rt/aio_write64.c
View File

@ -1,2 +1,30 @@
#define BE_AIO64
#include <aio_write.c>
/* Asynchronous write, 64bit offset version.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <aio_misc.h>
int
aio_write64 (struct aiocb64 *aiocbp)
{
return (__aio_enqueue_request ((aiocb_union *) aiocbp, LIO_WRITE64) == NULL
? -1 : 0);
}

238
rt/lio_listio.c
View File

@ -1,6 +1,7 @@
/* Enqueue a list of read or write requests. Stub version.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
/* Enqueue and list of read or write requests.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -16,25 +17,232 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef lio_listio
#include <aio.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef BE_AIO64
#define lio_listio lio_listio64
#define aiocb aiocb64
#define aio_read aio_read64
#define aio_write aio_write64
#define aio_suspend aio_suspend64
#include <aio_misc.h>
#define LIO_OPCODE_BASE 0
#endif
#include <shlib-compat.h>
/* We need this special structure to handle asynchronous I/O. */
struct async_waitlist
{
unsigned int counter;
struct sigevent sigev;
struct waitlist list[0];
};
/* The code in glibc 2.1 to glibc 2.4 issued only one event when all
requests submitted with lio_listio finished. The existing practice
is to issue events for the individual requests as well. This is
what the new code does. */
#if SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_4)
# define LIO_MODE(mode) ((mode) & 127)
# define NO_INDIVIDUAL_EVENT_P(mode) ((mode) & 128)
#else
# define LIO_MODE(mode) mode
# define NO_INDIVIDUAL_EVENT_P(mode) 0
#endif
static int
lio_listio_internal (int mode, struct aiocb *const list[], int nent,
struct sigevent *sig)
{
struct sigevent defsigev;
struct requestlist *requests[nent];
int cnt;
volatile unsigned int total = 0;
int result = 0;
if (sig == NULL)
{
defsigev.sigev_notify = SIGEV_NONE;
sig = &defsigev;
}
/* Request the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
/* Now we can enqueue all requests. Since we already acquired the
mutex the enqueue function need not do this. */
for (cnt = 0; cnt < nent; ++cnt)
if (list[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP)
{
if (NO_INDIVIDUAL_EVENT_P (mode))
list[cnt]->aio_sigevent.sigev_notify = SIGEV_NONE;
requests[cnt] = __aio_enqueue_request ((aiocb_union *) list[cnt],
(list[cnt]->aio_lio_opcode
| LIO_OPCODE_BASE));
if (requests[cnt] != NULL)
/* Successfully enqueued. */
++total;
else
/* Signal that we've seen an error. `errno' and the error code
of the aiocb will tell more. */
result = -1;
}
else
requests[cnt] = NULL;
if (total == 0)
{
/* We don't have anything to do except signalling if we work
asynchronously. */
/* Release the mutex. We do this before raising a signal since the
signal handler might do a `siglongjmp' and then the mutex is
locked forever. */
pthread_mutex_unlock (&__aio_requests_mutex);
if (LIO_MODE (mode) == LIO_NOWAIT)
__aio_notify_only (sig);
return result;
}
else if (LIO_MODE (mode) == LIO_WAIT)
{
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
int oldstate;
#endif
struct waitlist waitlist[nent];
total = 0;
for (cnt = 0; cnt < nent; ++cnt)
{
assert (requests[cnt] == NULL || list[cnt] != NULL);
if (requests[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP)
{
#ifndef DONT_NEED_AIO_MISC_COND
waitlist[cnt].cond = &cond;
#endif
waitlist[cnt].result = &result;
waitlist[cnt].next = requests[cnt]->waiting;
waitlist[cnt].counterp = &total;
waitlist[cnt].sigevp = NULL;
requests[cnt]->waiting = &waitlist[cnt];
++total;
}
}
#ifdef DONT_NEED_AIO_MISC_COND
AIO_MISC_WAIT (result, total, NULL, 0);
#else
/* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancellation
points we must be careful. We added entries to the waiting lists
which we must remove. So defer cancellation for now. */
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
while (total > 0)
pthread_cond_wait (&cond, &__aio_requests_mutex);
/* Now it's time to restore the cancellation state. */
pthread_setcancelstate (oldstate, NULL);
/* Release the conditional variable. */
if (pthread_cond_destroy (&cond) != 0)
/* This must never happen. */
abort ();
#endif
/* If any of the I/O requests failed, return -1 and set errno. */
if (result != 0)
{
__set_errno (result == EINTR ? EINTR : EIO);
result = -1;
}
}
else
{
struct async_waitlist *waitlist;
waitlist = (struct async_waitlist *)
malloc (sizeof (struct async_waitlist)
+ (nent * sizeof (struct waitlist)));
if (waitlist == NULL)
{
__set_errno (EAGAIN);
result = -1;
}
else
{
total = 0;
for (cnt = 0; cnt < nent; ++cnt)
{
assert (requests[cnt] == NULL || list[cnt] != NULL);
if (requests[cnt] != NULL
&& list[cnt]->aio_lio_opcode != LIO_NOP)
{
#ifndef DONT_NEED_AIO_MISC_COND
waitlist->list[cnt].cond = NULL;
#endif
waitlist->list[cnt].result = NULL;
waitlist->list[cnt].next = requests[cnt]->waiting;
waitlist->list[cnt].counterp = &waitlist->counter;
waitlist->list[cnt].sigevp = &waitlist->sigev;
requests[cnt]->waiting = &waitlist->list[cnt];
++total;
}
}
waitlist->counter = total;
waitlist->sigev = *sig;
}
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
return result;
}
#if SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_4)
int
attribute_compat_text_section
__lio_listio_21 (int mode, struct aiocb *const list[], int nent,
struct sigevent *sig)
{
/* Check arguments. */
if (mode != LIO_WAIT && mode != LIO_NOWAIT)
{
__set_errno (EINVAL);
return -1;
}
return lio_listio_internal (mode | LIO_NO_INDIVIDUAL_EVENT, list, nent, sig);
}
compat_symbol (librt, __lio_listio_21, lio_listio, GLIBC_2_1);
#endif
int
lio_listio (int mode,
struct aiocb *const list[], int nent,
struct sigevent *sig)
__lio_listio_item_notify (int mode, struct aiocb *const list[], int nent,
struct sigevent *sig)
{
__set_errno (ENOSYS);
return -1;
}
/* Check arguments. */
if (mode != LIO_WAIT && mode != LIO_NOWAIT)
{
__set_errno (EINVAL);
return -1;
}
stub_warning (lio_listio)
return lio_listio_internal (mode, list, nent, sig);
}
versioned_symbol (librt, __lio_listio_item_notify, lio_listio, GLIBC_2_4);

33
rt/lio_listio64.c
View File

@ -1,2 +1,33 @@
#define BE_AIO64
/* Enqueue and list of read or write requests, 64bit offset version.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <aio_misc.h>
#define lio_listio lio_listio64
#define __lio_listio_21 __lio_listio64_21
#define __lio_listio_item_notify __lio_listio64_item_notify
#define aiocb aiocb64
#define LIO_OPCODE_BASE 128
#include <lio_listio.c>

156
rt/timer_create.c
View File

@ -1,10 +1,11 @@
/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
@ -12,17 +13,154 @@
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <signal.h>
#include <pthread.h>
#include <time.h>
#include <unistd.h>
#include "posix-timer.h"
/* Create new per-process timer using CLOCK. */
int
timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid)
{
__set_errno (ENOSYS);
return -1;
int retval = -1;
struct timer_node *newtimer = NULL;
struct thread_node *thread = NULL;
if (0
#if defined _POSIX_CPUTIME && _POSIX_CPUTIME >= 0
|| clock_id == CLOCK_PROCESS_CPUTIME_ID
#endif
#if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
|| clock_id == CLOCK_THREAD_CPUTIME_ID
#endif
)
{
/* We don't allow timers for CPU clocks. At least not in the
moment. */
__set_errno (ENOTSUP);
return -1;
}
if (clock_id != CLOCK_REALTIME)
{
__set_errno (EINVAL);
return -1;
}
pthread_once (&__timer_init_once_control, __timer_init_once);
if (__timer_init_failed)
{
__set_errno (ENOMEM);
return -1;
}
pthread_mutex_lock (&__timer_mutex);
newtimer = __timer_alloc ();
if (__glibc_unlikely (newtimer == NULL))
{
__set_errno (EAGAIN);
goto unlock_bail;
}
if (evp != NULL)
newtimer->event = *evp;
else
{
newtimer->event.sigev_notify = SIGEV_SIGNAL;
newtimer->event.sigev_signo = SIGALRM;
newtimer->event.sigev_value.sival_ptr = newtimer;
newtimer->event.sigev_notify_function = 0;
}
newtimer->event.sigev_notify_attributes = &newtimer->attr;
newtimer->creator_pid = getpid ();
switch (__builtin_expect (newtimer->event.sigev_notify, SIGEV_SIGNAL))
{
case SIGEV_NONE:
case SIGEV_SIGNAL:
/* We have a global thread for delivering timed signals.
If it is not running, try to start it up. */
thread = &__timer_signal_thread_rclk;
if (! thread->exists)
{
if (__builtin_expect (__timer_thread_start (thread),
1) < 0)
{
__set_errno (EAGAIN);
goto unlock_bail;
}
}
break;
case SIGEV_THREAD:
/* Copy over thread attributes or set up default ones. */
if (evp->sigev_notify_attributes)
newtimer->attr = *(pthread_attr_t *) evp->sigev_notify_attributes;
else
pthread_attr_init (&newtimer->attr);
/* Ensure thread attributes call for deatched thread. */
pthread_attr_setdetachstate (&newtimer->attr, PTHREAD_CREATE_DETACHED);
/* Try to find existing thread having the right attributes. */
thread = __timer_thread_find_matching (&newtimer->attr, clock_id);
/* If no existing thread has these attributes, try to allocate one. */
if (thread == NULL)
thread = __timer_thread_alloc (&newtimer->attr, clock_id);
/* Out of luck; no threads are available. */
if (__glibc_unlikely (thread == NULL))
{
__set_errno (EAGAIN);
goto unlock_bail;
}
/* If the thread is not running already, try to start it. */
if (! thread->exists
&& __builtin_expect (! __timer_thread_start (thread), 0))
{
__set_errno (EAGAIN);
goto unlock_bail;
}
break;
default:
__set_errno (EINVAL);
goto unlock_bail;
}
newtimer->clock = clock_id;
newtimer->abstime = 0;
newtimer->armed = 0;
newtimer->thread = thread;
*timerid = timer_ptr2id (newtimer);
retval = 0;
if (__builtin_expect (retval, 0) == -1)
{
unlock_bail:
if (thread != NULL)
__timer_thread_dealloc (thread);
if (newtimer != NULL)
{
timer_delref (newtimer);
__timer_dealloc (newtimer);
}
}
pthread_mutex_unlock (&__timer_mutex);
return retval;
}
stub_warning (timer_create)

58
rt/timer_delete.c
View File

@ -1,10 +1,11 @@
/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
@ -12,17 +13,56 @@
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <errno.h>
#include <pthread.h>
#include <time.h>
#include "posix-timer.h"
/* Delete timer TIMERID. */
int
timer_delete (timer_t timerid)
{
__set_errno (ENOSYS);
return -1;
struct timer_node *timer;
int retval = -1;
pthread_mutex_lock (&__timer_mutex);
timer = timer_id2ptr (timerid);
if (! timer_valid (timer))
/* Invalid timer ID or the timer is not in use. */
__set_errno (EINVAL);
else
{
if (timer->armed && timer->thread != NULL)
{
struct thread_node *thread = timer->thread;
assert (thread != NULL);
/* If thread is cancelled while waiting for handler to terminate,
the mutex is unlocked and timer_delete is aborted. */
pthread_cleanup_push (__timer_mutex_cancel_handler, &__timer_mutex);
/* If timer is currently being serviced, wait for it to finish. */
while (thread->current_timer == timer)
pthread_cond_wait (&thread->cond, &__timer_mutex);
pthread_cleanup_pop (0);
}
/* Remove timer from whatever queue it may be on and deallocate it. */
timer->inuse = TIMER_DELETED;
list_unlink_ip (&timer->links);
timer_delref (timer);
retval = 0;
}
pthread_mutex_unlock (&__timer_mutex);
return retval;
}
stub_warning (timer_delete)

33
rt/timer_getoverr.c
View File

@ -1,10 +1,11 @@
/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
@ -12,17 +13,31 @@
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <time.h>
#include "posix-timer.h"
/* Get expiration overrun for timer TIMERID. */
int
timer_getoverrun (timer_t timerid)
{
__set_errno (ENOSYS);
return -1;
struct timer_node *timer;
int retval = -1;
pthread_mutex_lock (&__timer_mutex);
if (! timer_valid (timer = timer_id2ptr (timerid)))
__set_errno (EINVAL);
else
retval = timer->overrun_count;
pthread_mutex_unlock (&__timer_mutex);
return retval;
}
stub_warning (timer_getoverrun)

64
rt/timer_gettime.c
View File

@ -1,10 +1,11 @@
/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
@ -12,17 +13,62 @@
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <time.h>
#include "posix-timer.h"
/* Get current value of timer TIMERID and store it in VLAUE. */
int
timer_gettime (timer_t timerid, struct itimerspec *value)
{
__set_errno (ENOSYS);
return -1;
struct timer_node *timer;
struct timespec now, expiry;
int retval = -1, armed = 0, valid;
clock_t clock = 0;
pthread_mutex_lock (&__timer_mutex);
timer = timer_id2ptr (timerid);
valid = timer_valid (timer);
if (valid) {
armed = timer->armed;
expiry = timer->expirytime;
clock = timer->clock;
value->it_interval = timer->value.it_interval;
}
pthread_mutex_unlock (&__timer_mutex);
if (valid)
{
if (armed)
{
__clock_gettime (clock, &now);
if (timespec_compare (&now, &expiry) < 0)
timespec_sub (&value->it_value, &expiry, &now);
else
{
value->it_value.tv_sec = 0;
value->it_value.tv_nsec = 0;
}
}
else
{
value->it_value.tv_sec = 0;
value->it_value.tv_nsec = 0;
}
retval = 0;
}
else
__set_errno (EINVAL);
return retval;
}
stub_warning (timer_gettime)

120
rt/timer_settime.c
View File

@ -1,10 +1,11 @@
/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
@ -12,18 +13,119 @@
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <time.h>
#include "posix-timer.h"
/* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
int
timer_settime (timer_t timerid, int flags, const struct itimerspec *value,
struct itimerspec *ovalue)
{
__set_errno (ENOSYS);
return -1;
struct timer_node *timer;
struct thread_node *thread = NULL;
struct timespec now;
int have_now = 0, need_wakeup = 0;
int retval = -1;
timer = timer_id2ptr (timerid);
if (timer == NULL)
{
__set_errno (EINVAL);
goto bail;
}
if (! valid_nanoseconds (value->it_interval.tv_nsec)
|| ! valid_nanoseconds (value->it_value.tv_nsec))
{
__set_errno (EINVAL);
goto bail;
}
/* Will need to know current time since this is a relative timer;
might as well make the system call outside of the lock now! */
if ((flags & TIMER_ABSTIME) == 0)
{
__clock_gettime (timer->clock, &now);
have_now = 1;
}
pthread_mutex_lock (&__timer_mutex);
timer_addref (timer);
/* One final check of timer validity; this one is possible only
until we have the mutex, because it accesses the inuse flag. */
if (! timer_valid(timer))
{
__set_errno (EINVAL);
goto unlock_bail;
}
if (ovalue != NULL)
{
ovalue->it_interval = timer->value.it_interval;
if (timer->armed)
{
if (! have_now)
{
pthread_mutex_unlock (&__timer_mutex);
__clock_gettime (timer->clock, &now);
have_now = 1;
pthread_mutex_lock (&__timer_mutex);
timer_addref (timer);
}
timespec_sub (&ovalue->it_value, &timer->expirytime, &now);
}
else
{
ovalue->it_value.tv_sec = 0;
ovalue->it_value.tv_nsec = 0;
}
}
timer->value = *value;
list_unlink_ip (&timer->links);
timer->armed = 0;
thread = timer->thread;
/* A value of { 0, 0 } causes the timer to be stopped. */
if (value->it_value.tv_sec != 0
|| __builtin_expect (value->it_value.tv_nsec != 0, 1))
{
if ((flags & TIMER_ABSTIME) != 0)
/* The user specified the expiration time. */
timer->expirytime = value->it_value;
else
timespec_add (&timer->expirytime, &now, &value->it_value);
/* Only need to wake up the thread if timer is inserted
at the head of the queue. */
if (thread != NULL)
need_wakeup = __timer_thread_queue_timer (thread, timer);
timer->armed = 1;
}
retval = 0;
unlock_bail:
timer_delref (timer);
pthread_mutex_unlock (&__timer_mutex);
bail:
if (thread != NULL && need_wakeup)
__timer_thread_wakeup (thread);
return retval;
}
stub_warning (timer_settime)

83
sysdeps/generic/aio_misc.h
View File

@ -1,5 +1,4 @@
/* Internal declarations for <aio.h> functions implementation. Stub version.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -20,17 +19,19 @@
#define _AIO_MISC_H 1
#include <aio.h>
#include <pthread.h>
/* Extend the operation enum. */
enum
{
LIO_DSYNC = LIO_READ + 1,
LIO_DSYNC = LIO_NOP + 1,
LIO_SYNC,
LIO_READ64 = LIO_READ | 128,
LIO_WRITE64 = LIO_WRITE | 128
};
/* Union of the two request types. */
typedef union
{
@ -39,9 +40,83 @@ typedef union
} aiocb_union;
/* Used to synchronize. */
struct waitlist
{
struct waitlist *next;
/* The next two fields is used in synchronous `lio_listio' operations. */
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t *cond;
#endif
int *result;
volatile unsigned int *counterp;
/* The next field is used in asynchronous `lio_listio' operations. */
struct sigevent *sigevp;
};
/* Status of a request. */
enum
{
no,
queued,
yes,
allocated,
done
};
/* Used to queue requests.. */
struct requestlist
{
int running;
struct requestlist *last_fd;
struct requestlist *next_fd;
struct requestlist *next_prio;
struct requestlist *next_run;
/* Pointer to the actual data. */
aiocb_union *aiocbp;
/* List of waiting processes. */
struct waitlist *waiting;
};
/* Lock for global I/O list of requests. */
extern pthread_mutex_t __aio_requests_mutex attribute_hidden;
/* Enqueue request. */
extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp,
int operation)
attribute_hidden;
/* Find request entry for given AIO control block. */
extern struct requestlist *__aio_find_req (aiocb_union *elem) attribute_hidden;
/* Find request entry for given file descriptor. */
extern struct requestlist *__aio_find_req_fd (int fildes) attribute_hidden;
/* Remove request from the list. */
extern void __aio_remove_request (struct requestlist *last,
struct requestlist *req, int all)
attribute_hidden;
/* Release the entry for the request. */
extern void __aio_free_request (struct requestlist *req) attribute_hidden;
/* Notify initiator of request and tell this everybody listening. */
extern void __aio_notify (struct requestlist *req) attribute_hidden;
/* Notify initiator of request. */
extern int __aio_notify_only (struct sigevent *sigev) attribute_hidden;
/* Send the signal. */
extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)
attribute_hidden;
#endif /* aio_misc.h */

0
sysdeps/pthread/timer_routines.c → sysdeps/htl/timer_routines.c
View File

5
sysdeps/pthread/Versions
View File

@ -1,5 +0,0 @@
librt {
GLIBC_2.4 {
lio_listio; lio_listio64;
}
}

157
sysdeps/pthread/aio_cancel.c
View File

@ -1,157 +0,0 @@
/* Cancel requests associated with given file descriptor.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* We use an UGLY hack to prevent gcc from finding us cheating. The
implementation of aio_cancel and aio_cancel64 are identical and so
we want to avoid code duplication by using aliases. But gcc sees
the different parameter lists and prints a warning. We define here
a function so that aio_cancel64 has no prototype. */
#ifndef aio_cancel
#define aio_cancel64 XXX
#include <aio.h>
/* And undo the hack. */
#undef aio_cancel64
#endif
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <aio_misc.h>
int
aio_cancel (int fildes, struct aiocb *aiocbp)
{
struct requestlist *req = NULL;
int result = AIO_ALLDONE;
/* If fildes is invalid, error. */
if (fcntl (fildes, F_GETFL) < 0)
{
__set_errno (EBADF);
return -1;
}
/* Request the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
/* We are asked to cancel a specific AIO request. */
if (aiocbp != NULL)
{
/* If the AIO request is not for this descriptor it has no value
to look for the request block. */
if (aiocbp->aio_fildes != fildes)
{
pthread_mutex_unlock (&__aio_requests_mutex);
__set_errno (EINVAL);
return -1;
}
else if (aiocbp->__error_code == EINPROGRESS)
{
struct requestlist *last = NULL;
req = __aio_find_req_fd (fildes);
if (req == NULL)
{
not_found:
pthread_mutex_unlock (&__aio_requests_mutex);
__set_errno (EINVAL);
return -1;
}
while (req->aiocbp != (aiocb_union *) aiocbp)
{
last = req;
req = req->next_prio;
if (req == NULL)
goto not_found;
}
/* Don't remove the entry if a thread is already working on it. */
if (req->running == allocated)
{
result = AIO_NOTCANCELED;
req = NULL;
}
else
{
/* We can remove the entry. */
__aio_remove_request (last, req, 0);
result = AIO_CANCELED;
req->next_prio = NULL;
}
}
}
else
{
/* Find the beginning of the list of all requests for this
desriptor. */
req = __aio_find_req_fd (fildes);
/* If any request is worked on by a thread it must be the first.
So either we can delete all requests or all but the first. */
if (req != NULL)
{
if (req->running == allocated)
{
struct requestlist *old = req;
req = req->next_prio;
old->next_prio = NULL;
result = AIO_NOTCANCELED;
if (req != NULL)
__aio_remove_request (old, req, 1);
}
else
{
result = AIO_CANCELED;
/* We can remove the entry. */
__aio_remove_request (NULL, req, 1);
}
}
}
/* Mark requests as canceled and send signal. */
while (req != NULL)
{
struct requestlist *old = req;
assert (req->running == yes || req->running == queued);
req->aiocbp->aiocb.__error_code = ECANCELED;
req->aiocbp->aiocb.__return_value = -1;
__aio_notify (req);
req = req->next_prio;
__aio_free_request (old);
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
return result;
}
#ifndef aio_cancel
weak_alias (aio_cancel, aio_cancel64)
#endif

48
sysdeps/pthread/aio_error.c
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@ -1,48 +0,0 @@
/* Return error status of asynchronous I/O request.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* We use an UGLY hack to prevent gcc from finding us cheating. The
implementation of aio_error and aio_error64 are identical and so
we want to avoid code duplication by using aliases. But gcc sees
the different parameter lists and prints a warning. We define here
a function so that aio_error64 has no prototype. */
#define aio_error64 XXX
#include <aio.h>
/* And undo the hack. */
#undef aio_error64
#include <aio_misc.h>
int
aio_error (const struct aiocb *aiocbp)
{
int ret;
/* Acquire the mutex to make sure all operations for this request are
complete. */
pthread_mutex_lock(&__aio_requests_mutex);
ret = aiocbp->__error_code;
pthread_mutex_unlock(&__aio_requests_mutex);
return ret;
}
weak_alias (aio_error, aio_error64)

57
sysdeps/pthread/aio_fsync.c
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@ -1,57 +0,0 @@
/* Synchronize I/O in given file descriptor.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* We use an UGLY hack to prevent gcc from finding us cheating. The
implementation of aio_fsync and aio_fsync64 are identical and so
we want to avoid code duplication by using aliases. But gcc sees
the different parameter lists and prints a warning. We define here
a function so that aio_fsync64 has no prototype. */
#define aio_fsync64 XXX
#include <aio.h>
/* And undo the hack. */
#undef aio_fsync64
#include <errno.h>
#include <fcntl.h>
#include <aio_misc.h>
int
aio_fsync (int op, struct aiocb *aiocbp)
{
if (op != O_DSYNC && __builtin_expect (op != O_SYNC, 0))
{
__set_errno (EINVAL);
return -1;
}
/* Verify that this is an open file descriptor. */
if (__glibc_unlikely (fcntl (aiocbp->aio_fildes, F_GETFL) == -1))
{
__set_errno (EBADF);
return -1;
}
return (__aio_enqueue_request ((aiocb_union *) aiocbp,
op == O_SYNC ? LIO_SYNC : LIO_DSYNC) == NULL
? -1 : 0);
}
weak_alias (aio_fsync, aio_fsync64)

721
sysdeps/pthread/aio_misc.c
View File

@ -1,721 +0,0 @@
/* Handle general operations.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <aio_misc.h>
#ifndef aio_create_helper_thread
# define aio_create_helper_thread __aio_create_helper_thread
extern inline int
__aio_create_helper_thread (pthread_t *threadp, void *(*tf) (void *), void *arg)
{
pthread_attr_t attr;
/* Make sure the thread is created detached. */
pthread_attr_init (&attr);
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
int ret = pthread_create (threadp, &attr, tf, arg);
(void) pthread_attr_destroy (&attr);
return ret;
}
#endif
static void add_request_to_runlist (struct requestlist *newrequest);
/* Pool of request list entries. */
static struct requestlist **pool;
/* Number of total and allocated pool entries. */
static size_t pool_max_size;
static size_t pool_size;
/* We implement a two dimensional array but allocate each row separately.
The macro below determines how many entries should be used per row.
It should better be a power of two. */
#define ENTRIES_PER_ROW 32
/* How many rows we allocate at once. */
#define ROWS_STEP 8
/* List of available entries. */
static struct requestlist *freelist;
/* List of request waiting to be processed. */
static struct requestlist *runlist;
/* Structure list of all currently processed requests. */
static struct requestlist *requests;
/* Number of threads currently running. */
static int nthreads;
/* Number of threads waiting for work to arrive. */
static int idle_thread_count;
/* These are the values used to optimize the use of AIO. The user can
overwrite them by using the `aio_init' function. */
static struct aioinit optim =
{
20, /* int aio_threads; Maximal number of threads. */
64, /* int aio_num; Number of expected simultaneous requests. */
0,
0,
0,
0,
1,
0
};
/* Since the list is global we need a mutex protecting it. */
pthread_mutex_t __aio_requests_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
/* When you add a request to the list and there are idle threads present,
you signal this condition variable. When a thread finishes work, it waits
on this condition variable for a time before it actually exits. */
pthread_cond_t __aio_new_request_notification = PTHREAD_COND_INITIALIZER;
/* Functions to handle request list pool. */
static struct requestlist *
get_elem (void)
{
struct requestlist *result;
if (freelist == NULL)
{
struct requestlist *new_row;
int cnt;
assert (sizeof (struct aiocb) == sizeof (struct aiocb64));
if (pool_size + 1 >= pool_max_size)
{
size_t new_max_size = pool_max_size + ROWS_STEP;
struct requestlist **new_tab;
new_tab = (struct requestlist **)
realloc (pool, new_max_size * sizeof (struct requestlist *));
if (new_tab == NULL)
return NULL;
pool_max_size = new_max_size;
pool = new_tab;
}
/* Allocate the new row. */
cnt = pool_size == 0 ? optim.aio_num : ENTRIES_PER_ROW;
new_row = (struct requestlist *) calloc (cnt,
sizeof (struct requestlist));
if (new_row == NULL)
return NULL;
pool[pool_size++] = new_row;
/* Put all the new entries in the freelist. */
do
{
new_row->next_prio = freelist;
freelist = new_row++;
}
while (--cnt > 0);
}
result = freelist;
freelist = freelist->next_prio;
return result;
}
void
__aio_free_request (struct requestlist *elem)
{
elem->running = no;
elem->next_prio = freelist;
freelist = elem;
}
struct requestlist *
__aio_find_req (aiocb_union *elem)
{
struct requestlist *runp = requests;
int fildes = elem->aiocb.aio_fildes;
while (runp != NULL && runp->aiocbp->aiocb.aio_fildes < fildes)
runp = runp->next_fd;
if (runp != NULL)
{
if (runp->aiocbp->aiocb.aio_fildes != fildes)
runp = NULL;
else
while (runp != NULL && runp->aiocbp != elem)
runp = runp->next_prio;
}
return runp;
}
struct requestlist *
__aio_find_req_fd (int fildes)
{
struct requestlist *runp = requests;
while (runp != NULL && runp->aiocbp->aiocb.aio_fildes < fildes)
runp = runp->next_fd;
return (runp != NULL && runp->aiocbp->aiocb.aio_fildes == fildes
? runp : NULL);
}
void
__aio_remove_request (struct requestlist *last, struct requestlist *req,
int all)
{
assert (req->running == yes || req->running == queued
|| req->running == done);
if (last != NULL)
last->next_prio = all ? NULL : req->next_prio;
else
{
if (all || req->next_prio == NULL)
{
if (req->last_fd != NULL)
req->last_fd->next_fd = req->next_fd;
else
requests = req->next_fd;
if (req->next_fd != NULL)
req->next_fd->last_fd = req->last_fd;
}
else
{
if (req->last_fd != NULL)
req->last_fd->next_fd = req->next_prio;
else
requests = req->next_prio;
if (req->next_fd != NULL)
req->next_fd->last_fd = req->next_prio;
req->next_prio->last_fd = req->last_fd;
req->next_prio->next_fd = req->next_fd;
/* Mark this entry as runnable. */
req->next_prio->running = yes;
}
if (req->running == yes)
{
struct requestlist *runp = runlist;
last = NULL;
while (runp != NULL)
{
if (runp == req)
{
if (last == NULL)
runlist = runp->next_run;
else
last->next_run = runp->next_run;
break;
}
last = runp;
runp = runp->next_run;
}
}
}
}
/* The thread handler. */
static void *handle_fildes_io (void *arg);
/* User optimization. */
void
__aio_init (const struct aioinit *init)
{
/* Get the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
/* Only allow writing new values if the table is not yet allocated. */
if (pool == NULL)
{
optim.aio_threads = init->aio_threads < 1 ? 1 : init->aio_threads;
assert (powerof2 (ENTRIES_PER_ROW));
optim.aio_num = (init->aio_num < ENTRIES_PER_ROW
? ENTRIES_PER_ROW
: init->aio_num & ~(ENTRIES_PER_ROW - 1));
}
if (init->aio_idle_time != 0)
optim.aio_idle_time = init->aio_idle_time;
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
}
weak_alias (__aio_init, aio_init)
/* The main function of the async I/O handling. It enqueues requests
and if necessary starts and handles threads. */
struct requestlist *
__aio_enqueue_request (aiocb_union *aiocbp, int operation)
{
int result = 0;
int policy, prio;
struct sched_param param;
struct requestlist *last, *runp, *newp;
int running = no;
if (operation == LIO_SYNC || operation == LIO_DSYNC)
aiocbp->aiocb.aio_reqprio = 0;
else if (aiocbp->aiocb.aio_reqprio < 0
#ifdef AIO_PRIO_DELTA_MAX
|| aiocbp->aiocb.aio_reqprio > AIO_PRIO_DELTA_MAX
#endif
)
{
/* Invalid priority value. */
__set_errno (EINVAL);
aiocbp->aiocb.__error_code = EINVAL;
aiocbp->aiocb.__return_value = -1;
return NULL;
}
/* Compute priority for this request. */
pthread_getschedparam (pthread_self (), &policy, &param);
prio = param.sched_priority - aiocbp->aiocb.aio_reqprio;
/* Get the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
last = NULL;
runp = requests;
/* First look whether the current file descriptor is currently
worked with. */
while (runp != NULL
&& runp->aiocbp->aiocb.aio_fildes < aiocbp->aiocb.aio_fildes)
{
last = runp;
runp = runp->next_fd;
}
/* Get a new element for the waiting list. */
newp = get_elem ();
if (newp == NULL)
{
pthread_mutex_unlock (&__aio_requests_mutex);
__set_errno (EAGAIN);
return NULL;
}
newp->aiocbp = aiocbp;
newp->waiting = NULL;
aiocbp->aiocb.__abs_prio = prio;
aiocbp->aiocb.__policy = policy;
aiocbp->aiocb.aio_lio_opcode = operation;
aiocbp->aiocb.__error_code = EINPROGRESS;
aiocbp->aiocb.__return_value = 0;
if (runp != NULL
&& runp->aiocbp->aiocb.aio_fildes == aiocbp->aiocb.aio_fildes)
{
/* The current file descriptor is worked on. It makes no sense
to start another thread since this new thread would fight
with the running thread for the resources. But we also cannot
say that the thread processing this desriptor shall immediately
after finishing the current job process this request if there
are other threads in the running queue which have a higher
priority. */
/* Simply enqueue it after the running one according to the
priority. */
last = NULL;
while (runp->next_prio != NULL
&& runp->next_prio->aiocbp->aiocb.__abs_prio >= prio)
{
last = runp;
runp = runp->next_prio;
}
newp->next_prio = runp->next_prio;
runp->next_prio = newp;
running = queued;
}
else
{
running = yes;
/* Enqueue this request for a new descriptor. */
if (last == NULL)
{
newp->last_fd = NULL;
newp->next_fd = requests;
if (requests != NULL)
requests->last_fd = newp;
requests = newp;
}
else
{
newp->next_fd = last->next_fd;
newp->last_fd = last;
last->next_fd = newp;
if (newp->next_fd != NULL)
newp->next_fd->last_fd = newp;
}
newp->next_prio = NULL;
last = NULL;
}
if (running == yes)
{
/* We try to create a new thread for this file descriptor. The
function which gets called will handle all available requests
for this descriptor and when all are processed it will
terminate.
If no new thread can be created or if the specified limit of
threads for AIO is reached we queue the request. */
/* See if we need to and are able to create a thread. */
if (nthreads < optim.aio_threads && idle_thread_count == 0)
{
pthread_t thid;
running = newp->running = allocated;
/* Now try to start a thread. */
result = aio_create_helper_thread (&thid, handle_fildes_io, newp);
if (result == 0)
/* We managed to enqueue the request. All errors which can
happen now can be recognized by calls to `aio_return' and
`aio_error'. */
++nthreads;
else
{
/* Reset the running flag. The new request is not running. */
running = newp->running = yes;
if (nthreads == 0)
{
/* We cannot create a thread in the moment and there is
also no thread running. This is a problem. `errno' is
set to EAGAIN if this is only a temporary problem. */
__aio_remove_request (last, newp, 0);
}
else
result = 0;
}
}
}
/* Enqueue the request in the run queue if it is not yet running. */
if (running == yes && result == 0)
{
add_request_to_runlist (newp);
/* If there is a thread waiting for work, then let it know that we
have just given it something to do. */
if (idle_thread_count > 0)
pthread_cond_signal (&__aio_new_request_notification);
}
if (result == 0)
newp->running = running;
else
{
/* Something went wrong. */
__aio_free_request (newp);
aiocbp->aiocb.__error_code = result;
__set_errno (result);
newp = NULL;
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
return newp;
}
static void *
handle_fildes_io (void *arg)
{
pthread_t self = pthread_self ();
struct sched_param param;
struct requestlist *runp = (struct requestlist *) arg;
aiocb_union *aiocbp;
int policy;
int fildes;
pthread_getschedparam (self, &policy, &param);
do
{
/* If runp is NULL, then we were created to service the work queue
in general, not to handle any particular request. In that case we
skip the "do work" stuff on the first pass, and go directly to the
"get work off the work queue" part of this loop, which is near the
end. */
if (runp == NULL)
pthread_mutex_lock (&__aio_requests_mutex);
else
{
/* Hopefully this request is marked as running. */
assert (runp->running == allocated);
/* Update our variables. */
aiocbp = runp->aiocbp;
fildes = aiocbp->aiocb.aio_fildes;
/* Change the priority to the requested value (if necessary). */
if (aiocbp->aiocb.__abs_prio != param.sched_priority
|| aiocbp->aiocb.__policy != policy)
{
param.sched_priority = aiocbp->aiocb.__abs_prio;
policy = aiocbp->aiocb.__policy;
pthread_setschedparam (self, policy, &param);
}
/* Process request pointed to by RUNP. We must not be disturbed
by signals. */
if ((aiocbp->aiocb.aio_lio_opcode & 127) == LIO_READ)
{
if (sizeof (off_t) != sizeof (off64_t)
&& aiocbp->aiocb.aio_lio_opcode & 128)
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (__pread64 (fildes, (void *)
aiocbp->aiocb64.aio_buf,
aiocbp->aiocb64.aio_nbytes,
aiocbp->aiocb64.aio_offset));
else
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (__libc_pread (fildes,
(void *)
aiocbp->aiocb.aio_buf,
aiocbp->aiocb.aio_nbytes,
aiocbp->aiocb.aio_offset));
if (aiocbp->aiocb.__return_value == -1 && errno == ESPIPE)
/* The Linux kernel is different from others. It returns
ESPIPE if using pread on a socket. Other platforms
simply ignore the offset parameter and behave like
read. */
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (read (fildes,
(void *) aiocbp->aiocb64.aio_buf,
aiocbp->aiocb64.aio_nbytes));
}
else if ((aiocbp->aiocb.aio_lio_opcode & 127) == LIO_WRITE)
{
if (sizeof (off_t) != sizeof (off64_t)
&& aiocbp->aiocb.aio_lio_opcode & 128)
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (__pwrite64 (fildes, (const void *)
aiocbp->aiocb64.aio_buf,
aiocbp->aiocb64.aio_nbytes,
aiocbp->aiocb64.aio_offset));
else
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (__libc_pwrite (fildes, (const void *)
aiocbp->aiocb.aio_buf,
aiocbp->aiocb.aio_nbytes,
aiocbp->aiocb.aio_offset));
if (aiocbp->aiocb.__return_value == -1 && errno == ESPIPE)
/* The Linux kernel is different from others. It returns
ESPIPE if using pwrite on a socket. Other platforms
simply ignore the offset parameter and behave like
write. */
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (write (fildes,
(void *) aiocbp->aiocb64.aio_buf,
aiocbp->aiocb64.aio_nbytes));
}
else if (aiocbp->aiocb.aio_lio_opcode == LIO_DSYNC)
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (fdatasync (fildes));
else if (aiocbp->aiocb.aio_lio_opcode == LIO_SYNC)
aiocbp->aiocb.__return_value =
TEMP_FAILURE_RETRY (fsync (fildes));
else
{
/* This is an invalid opcode. */
aiocbp->aiocb.__return_value = -1;
__set_errno (EINVAL);
}
/* Get the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
if (aiocbp->aiocb.__return_value == -1)
aiocbp->aiocb.__error_code = errno;
else
aiocbp->aiocb.__error_code = 0;
/* Send the signal to notify about finished processing of the
request. */
__aio_notify (runp);
/* For debugging purposes we reset the running flag of the
finished request. */
assert (runp->running == allocated);
runp->running = done;
/* Now dequeue the current request. */
__aio_remove_request (NULL, runp, 0);
if (runp->next_prio != NULL)
add_request_to_runlist (runp->next_prio);
/* Free the old element. */
__aio_free_request (runp);
}
runp = runlist;
/* If the runlist is empty, then we sleep for a while, waiting for
something to arrive in it. */
if (runp == NULL && optim.aio_idle_time >= 0)
{
struct timespec now;
struct timespec wakeup_time;
++idle_thread_count;
__clock_gettime (CLOCK_REALTIME, &now);
wakeup_time.tv_sec = now.tv_sec + optim.aio_idle_time;
wakeup_time.tv_nsec = now.tv_nsec;
if (wakeup_time.tv_nsec >= 1000000000)
{
wakeup_time.tv_nsec -= 1000000000;
++wakeup_time.tv_sec;
}
pthread_cond_timedwait (&__aio_new_request_notification,
&__aio_requests_mutex,
&wakeup_time);
--idle_thread_count;
runp = runlist;
}
if (runp == NULL)
--nthreads;
else
{
assert (runp->running == yes);
runp->running = allocated;
runlist = runp->next_run;
/* If we have a request to process, and there's still another in
the run list, then we need to either wake up or create a new
thread to service the request that is still in the run list. */
if (runlist != NULL)
{
/* There are at least two items in the work queue to work on.
If there are other idle threads, then we should wake them
up for these other work elements; otherwise, we should try
to create a new thread. */
if (idle_thread_count > 0)
pthread_cond_signal (&__aio_new_request_notification);
else if (nthreads < optim.aio_threads)
{
pthread_t thid;
pthread_attr_t attr;
/* Make sure the thread is created detached. */
pthread_attr_init (&attr);
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
/* Now try to start a thread. If we fail, no big deal,
because we know that there is at least one thread (us)
that is working on AIO operations. */
if (pthread_create (&thid, &attr, handle_fildes_io, NULL)
== 0)
++nthreads;
}
}
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
}
while (runp != NULL);
return NULL;
}
/* Free allocated resources. */
libc_freeres_fn (free_res)
{
size_t row;
for (row = 0; row < pool_max_size; ++row)
free (pool[row]);
free (pool);
}
/* Add newrequest to the runlist. The __abs_prio flag of newrequest must
be correctly set to do this. Also, you had better set newrequest's
"running" flag to "yes" before you release your lock or you'll throw an
assertion. */
static void
add_request_to_runlist (struct requestlist *newrequest)
{
int prio = newrequest->aiocbp->aiocb.__abs_prio;
struct requestlist *runp;
if (runlist == NULL || runlist->aiocbp->aiocb.__abs_prio < prio)
{
newrequest->next_run = runlist;
runlist = newrequest;
}
else
{
runp = runlist;
while (runp->next_run != NULL
&& runp->next_run->aiocbp->aiocb.__abs_prio >= prio)
runp = runp->next_run;
newrequest->next_run = runp->next_run;
runp->next_run = newrequest;
}
}

122
sysdeps/pthread/aio_misc.h
View File

@ -1,122 +0,0 @@
/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _AIO_MISC_H
#define _AIO_MISC_H 1
#include <aio.h>
#include <pthread.h>
/* Extend the operation enum. */
enum
{
LIO_DSYNC = LIO_NOP + 1,
LIO_SYNC,
LIO_READ64 = LIO_READ | 128,
LIO_WRITE64 = LIO_WRITE | 128
};
/* Union of the two request types. */
typedef union
{
struct aiocb aiocb;
struct aiocb64 aiocb64;
} aiocb_union;
/* Used to synchronize. */
struct waitlist
{
struct waitlist *next;
/* The next two fields is used in synchronous `lio_listio' operations. */
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t *cond;
#endif
int *result;
volatile unsigned int *counterp;
/* The next field is used in asynchronous `lio_listio' operations. */
struct sigevent *sigevp;
};
/* Status of a request. */
enum
{
no,
queued,
yes,
allocated,
done
};
/* Used to queue requests.. */
struct requestlist
{
int running;
struct requestlist *last_fd;
struct requestlist *next_fd;
struct requestlist *next_prio;
struct requestlist *next_run;
/* Pointer to the actual data. */
aiocb_union *aiocbp;
/* List of waiting processes. */
struct waitlist *waiting;
};
/* Lock for global I/O list of requests. */
extern pthread_mutex_t __aio_requests_mutex attribute_hidden;
/* Enqueue request. */
extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp,
int operation)
attribute_hidden;
/* Find request entry for given AIO control block. */
extern struct requestlist *__aio_find_req (aiocb_union *elem) attribute_hidden;
/* Find request entry for given file descriptor. */
extern struct requestlist *__aio_find_req_fd (int fildes) attribute_hidden;
/* Remove request from the list. */
extern void __aio_remove_request (struct requestlist *last,
struct requestlist *req, int all)
attribute_hidden;
/* Release the entry for the request. */
extern void __aio_free_request (struct requestlist *req) attribute_hidden;
/* Notify initiator of request and tell this everybody listening. */
extern void __aio_notify (struct requestlist *req) attribute_hidden;
/* Notify initiator of request. */
extern int __aio_notify_only (struct sigevent *sigev) attribute_hidden;
/* Send the signal. */
extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)
attribute_hidden;
#endif /* aio_misc.h */

157
sysdeps/pthread/aio_notify.c
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@ -1,157 +0,0 @@
/* Notify initiator of AIO request.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <aio_misc.h>
#include <signal.h>
#ifndef aio_start_notify_thread
# define aio_start_notify_thread() do { } while (0)
#endif
struct notify_func
{
void (*func) (sigval_t);
sigval_t value;
};
static void *
notify_func_wrapper (void *arg)
{
aio_start_notify_thread ();
struct notify_func *const n = arg;
void (*func) (sigval_t) = n->func;
sigval_t value = n->value;
free (n);
(*func) (value);
return NULL;
}
int
__aio_notify_only (struct sigevent *sigev)
{
int result = 0;
/* Send the signal to notify about finished processing of the request. */
if (__glibc_unlikely (sigev->sigev_notify == SIGEV_THREAD))
{
/* We have to start a thread. */
pthread_t tid;
pthread_attr_t attr, *pattr;
pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
if (pattr == NULL)
{
pthread_attr_init (&attr);
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
pattr = &attr;
}
/* SIGEV may be freed as soon as we return, so we cannot let the
notification thread use that pointer. Even though a sigval_t is
only one word and the same size as a void *, we cannot just pass
the value through pthread_create as the argument and have the new
thread run the user's function directly, because on some machines
the calling convention for a union like sigval_t is different from
that for a pointer type like void *. */
struct notify_func *nf = malloc (sizeof *nf);
if (nf == NULL)
result = -1;
else
{
nf->func = sigev->sigev_notify_function;
nf->value = sigev->sigev_value;
if (pthread_create (&tid, pattr, notify_func_wrapper, nf) < 0)
{
free (nf);
result = -1;
}
}
}
else if (sigev->sigev_notify == SIGEV_SIGNAL)
{
/* We have to send a signal. */
#if _POSIX_REALTIME_SIGNALS > 0
/* Note that the standard gives us the option of using a plain
non-queuing signal here when SA_SIGINFO is not set for the signal. */
if (__aio_sigqueue (sigev->sigev_signo, sigev->sigev_value, getpid ())
< 0)
result = -1;
#else
/* There are no queued signals on this system at all. */
result = raise (sigev->sigev_signo);
#endif
}
return result;
}
void
__aio_notify (struct requestlist *req)
{
struct waitlist *waitlist;
struct aiocb *aiocbp = &req->aiocbp->aiocb;
if (__aio_notify_only (&aiocbp->aio_sigevent) != 0)
{
/* XXX What shall we do if already an error is set by
read/write/fsync? */
aiocbp->__error_code = errno;
aiocbp->__return_value = -1;
}
/* Now also notify possibly waiting threads. */
waitlist = req->waiting;
while (waitlist != NULL)
{
struct waitlist *next = waitlist->next;
if (waitlist->sigevp == NULL)
{
if (waitlist->result != NULL && aiocbp->__return_value == -1)
*waitlist->result = -1;
#ifdef DONT_NEED_AIO_MISC_COND
AIO_MISC_NOTIFY (waitlist);
#else
/* Decrement the counter. */
--*waitlist->counterp;
pthread_cond_signal (waitlist->cond);
#endif
}
else
/* This is part of an asynchronous `lio_listio' operation. If
this request is the last one, send the signal. */
if (--*waitlist->counterp == 0)
{
__aio_notify_only (waitlist->sigevp);
/* This is tricky. See lio_listio.c for the reason why
this works. */
free ((void *) waitlist->counterp);
}
waitlist = next;
}
}

30
sysdeps/pthread/aio_read.c
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@ -1,30 +0,0 @@
/* Asynchronous read.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <aio_misc.h>
int
aio_read (struct aiocb *aiocbp)
{
return (__aio_enqueue_request ((aiocb_union *) aiocbp, LIO_READ) == NULL
? -1 : 0);
}

30
sysdeps/pthread/aio_read64.c
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@ -1,30 +0,0 @@
/* Asynchronous read, 64bit offset version.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <aio_misc.h>
int
aio_read64 (struct aiocb64 *aiocbp)
{
return (__aio_enqueue_request ((aiocb_union *) aiocbp, LIO_READ64) == NULL
? -1 : 0);
}

263
sysdeps/pthread/aio_suspend.c
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@ -1,263 +0,0 @@
/* Suspend until termination of a requests.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* We use an UGLY hack to prevent gcc from finding us cheating. The
implementations of aio_suspend and aio_suspend64 are identical and so
we want to avoid code duplication by using aliases. But gcc sees
the different parameter lists and prints a warning. We define here
a function so that aio_suspend64 has no prototype. */
#define aio_suspend64 XXX
#include <aio.h>
/* And undo the hack. */
#undef aio_suspend64
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
#include <sys/time.h>
#include <libc-lock.h>
#include <aio_misc.h>
struct clparam
{
const struct aiocb *const *list;
struct waitlist *waitlist;
struct requestlist **requestlist;
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t *cond;
#endif
int nent;
};
static void
cleanup (void *arg)
{
#ifdef DONT_NEED_AIO_MISC_COND
/* Acquire the mutex. If pthread_cond_*wait is used this would
happen implicitly. */
pthread_mutex_lock (&__aio_requests_mutex);
#endif
const struct clparam *param = (const struct clparam *) arg;
/* Now remove the entry in the waiting list for all requests
which didn't terminate. */
int cnt = param->nent;
while (cnt-- > 0)
if (param->list[cnt] != NULL
&& param->list[cnt]->__error_code == EINPROGRESS)
{
struct waitlist **listp;
assert (param->requestlist[cnt] != NULL);
/* There is the chance that we cannot find our entry anymore. This
could happen if the request terminated and restarted again. */
listp = &param->requestlist[cnt]->waiting;
while (*listp != NULL && *listp != &param->waitlist[cnt])
listp = &(*listp)->next;
if (*listp != NULL)
*listp = (*listp)->next;
}
#ifndef DONT_NEED_AIO_MISC_COND
/* Release the conditional variable. */
(void) pthread_cond_destroy (param->cond);
#endif
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
}
#ifdef DONT_NEED_AIO_MISC_COND
static int
__attribute__ ((noinline))
do_aio_misc_wait (unsigned int *cntr, const struct __timespec64 *timeout)
{
int result = 0;
AIO_MISC_WAIT (result, *cntr, timeout, 1);
return result;
}
#endif
int
__aio_suspend_time64 (const struct aiocb *const list[], int nent,
const struct __timespec64 *timeout)
{
if (__glibc_unlikely (nent < 0))
{
__set_errno (EINVAL);
return -1;
}
struct waitlist waitlist[nent];
struct requestlist *requestlist[nent];
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
#endif
int cnt;
bool any = false;
int result = 0;
unsigned int cntr = 1;
/* Request the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
/* There is not yet a finished request. Signal the request that
we are working for it. */
for (cnt = 0; cnt < nent; ++cnt)
if (list[cnt] != NULL)
{
if (list[cnt]->__error_code == EINPROGRESS)
{
requestlist[cnt] = __aio_find_req ((aiocb_union *) list[cnt]);
if (requestlist[cnt] != NULL)
{
#ifndef DONT_NEED_AIO_MISC_COND
waitlist[cnt].cond = &cond;
#endif
waitlist[cnt].result = NULL;
waitlist[cnt].next = requestlist[cnt]->waiting;
waitlist[cnt].counterp = &cntr;
waitlist[cnt].sigevp = NULL;
requestlist[cnt]->waiting = &waitlist[cnt];
any = true;
}
else
/* We will never suspend. */
break;
}
else
/* We will never suspend. */
break;
}
struct __timespec64 ts;
if (timeout != NULL)
{
__clock_gettime64 (CLOCK_MONOTONIC, &ts);
ts.tv_sec += timeout->tv_sec;
ts.tv_nsec += timeout->tv_nsec;
if (ts.tv_nsec >= 1000000000)
{
ts.tv_nsec -= 1000000000;
ts.tv_sec++;
}
}
/* Only if none of the entries is NULL or finished to be wait. */
if (cnt == nent && any)
{
struct clparam clparam =
{
.list = list,
.waitlist = waitlist,
.requestlist = requestlist,
#ifndef DONT_NEED_AIO_MISC_COND
.cond = &cond,
#endif
.nent = nent
};
pthread_cleanup_push (cleanup, &clparam);
#ifdef DONT_NEED_AIO_MISC_COND
result = do_aio_misc_wait (&cntr, timeout == NULL ? NULL : &ts);
#else
struct timespec ts32 = valid_timespec64_to_timespec (ts);
result = pthread_cond_timedwait (&cond, &__aio_requests_mutex,
timeout == NULL ? NULL : &ts32);
#endif
pthread_cleanup_pop (0);
}
/* Now remove the entry in the waiting list for all requests
which didn't terminate. */
while (cnt-- > 0)
if (list[cnt] != NULL && list[cnt]->__error_code == EINPROGRESS)
{
struct waitlist **listp;
assert (requestlist[cnt] != NULL);
/* There is the chance that we cannot find our entry anymore. This
could happen if the request terminated and restarted again. */
listp = &requestlist[cnt]->waiting;
while (*listp != NULL && *listp != &waitlist[cnt])
listp = &(*listp)->next;
if (*listp != NULL)
*listp = (*listp)->next;
}
#ifndef DONT_NEED_AIO_MISC_COND
/* Release the conditional variable. */
if (__glibc_unlikely (pthread_cond_destroy (&cond) != 0))
/* This must never happen. */
abort ();
#endif
if (result != 0)
{
#ifndef DONT_NEED_AIO_MISC_COND
/* An error occurred. Possibly it's ETIMEDOUT. We have to translate
the timeout error report of `pthread_cond_timedwait' to the
form expected from `aio_suspend'. */
if (result == ETIMEDOUT)
__set_errno (EAGAIN);
else
#endif
__set_errno (result);
result = -1;
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
return result;
}
#if __TIMESIZE != 64
librt_hidden_def (__aio_suspend_time64)
int
__aio_suspend (const struct aiocb *const list[], int nent,
const struct timespec *timeout)
{
struct __timespec64 ts64;
if (timeout != NULL)
ts64 = valid_timespec_to_timespec64 (*timeout);
return __aio_suspend_time64 (list, nent, timeout != NULL ? &ts64 : NULL);
}
#endif
weak_alias (__aio_suspend, aio_suspend)
weak_alias (aio_suspend, aio_suspend64)

30
sysdeps/pthread/aio_write.c
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@ -1,30 +0,0 @@
/* Asynchronous write.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <aio_misc.h>
int
aio_write (struct aiocb *aiocbp)
{
return (__aio_enqueue_request ((aiocb_union *) aiocbp, LIO_WRITE) == NULL
? -1 : 0);
}

30
sysdeps/pthread/aio_write64.c
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@ -1,30 +0,0 @@
/* Asynchronous write, 64bit offset version.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <aio_misc.h>
int
aio_write64 (struct aiocb64 *aiocbp)
{
return (__aio_enqueue_request ((aiocb_union *) aiocbp, LIO_WRITE64) == NULL
? -1 : 0);
}

248
sysdeps/pthread/lio_listio.c
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@ -1,248 +0,0 @@
/* Enqueue and list of read or write requests.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef lio_listio
#include <aio.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <aio_misc.h>
#define LIO_OPCODE_BASE 0
#endif
#include <shlib-compat.h>
/* We need this special structure to handle asynchronous I/O. */
struct async_waitlist
{
unsigned int counter;
struct sigevent sigev;
struct waitlist list[0];
};
/* The code in glibc 2.1 to glibc 2.4 issued only one event when all
requests submitted with lio_listio finished. The existing practice
is to issue events for the individual requests as well. This is
what the new code does. */
#if SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_4)
# define LIO_MODE(mode) ((mode) & 127)
# define NO_INDIVIDUAL_EVENT_P(mode) ((mode) & 128)
#else
# define LIO_MODE(mode) mode
# define NO_INDIVIDUAL_EVENT_P(mode) 0
#endif
static int
lio_listio_internal (int mode, struct aiocb *const list[], int nent,
struct sigevent *sig)
{
struct sigevent defsigev;
struct requestlist *requests[nent];
int cnt;
volatile unsigned int total = 0;
int result = 0;
if (sig == NULL)
{
defsigev.sigev_notify = SIGEV_NONE;
sig = &defsigev;
}
/* Request the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
/* Now we can enqueue all requests. Since we already acquired the
mutex the enqueue function need not do this. */
for (cnt = 0; cnt < nent; ++cnt)
if (list[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP)
{
if (NO_INDIVIDUAL_EVENT_P (mode))
list[cnt]->aio_sigevent.sigev_notify = SIGEV_NONE;
requests[cnt] = __aio_enqueue_request ((aiocb_union *) list[cnt],
(list[cnt]->aio_lio_opcode
| LIO_OPCODE_BASE));
if (requests[cnt] != NULL)
/* Successfully enqueued. */
++total;
else
/* Signal that we've seen an error. `errno' and the error code
of the aiocb will tell more. */
result = -1;
}
else
requests[cnt] = NULL;
if (total == 0)
{
/* We don't have anything to do except signalling if we work
asynchronously. */
/* Release the mutex. We do this before raising a signal since the
signal handler might do a `siglongjmp' and then the mutex is
locked forever. */
pthread_mutex_unlock (&__aio_requests_mutex);
if (LIO_MODE (mode) == LIO_NOWAIT)
__aio_notify_only (sig);
return result;
}
else if (LIO_MODE (mode) == LIO_WAIT)
{
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
int oldstate;
#endif
struct waitlist waitlist[nent];
total = 0;
for (cnt = 0; cnt < nent; ++cnt)
{
assert (requests[cnt] == NULL || list[cnt] != NULL);
if (requests[cnt] != NULL && list[cnt]->aio_lio_opcode != LIO_NOP)
{
#ifndef DONT_NEED_AIO_MISC_COND
waitlist[cnt].cond = &cond;
#endif
waitlist[cnt].result = &result;
waitlist[cnt].next = requests[cnt]->waiting;
waitlist[cnt].counterp = &total;
waitlist[cnt].sigevp = NULL;
requests[cnt]->waiting = &waitlist[cnt];
++total;
}
}
#ifdef DONT_NEED_AIO_MISC_COND
AIO_MISC_WAIT (result, total, NULL, 0);
#else
/* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancellation
points we must be careful. We added entries to the waiting lists
which we must remove. So defer cancellation for now. */
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
while (total > 0)
pthread_cond_wait (&cond, &__aio_requests_mutex);
/* Now it's time to restore the cancellation state. */
pthread_setcancelstate (oldstate, NULL);
/* Release the conditional variable. */
if (pthread_cond_destroy (&cond) != 0)
/* This must never happen. */
abort ();
#endif
/* If any of the I/O requests failed, return -1 and set errno. */
if (result != 0)
{
__set_errno (result == EINTR ? EINTR : EIO);
result = -1;
}
}
else
{
struct async_waitlist *waitlist;
waitlist = (struct async_waitlist *)
malloc (sizeof (struct async_waitlist)
+ (nent * sizeof (struct waitlist)));
if (waitlist == NULL)
{
__set_errno (EAGAIN);
result = -1;
}
else
{
total = 0;
for (cnt = 0; cnt < nent; ++cnt)
{
assert (requests[cnt] == NULL || list[cnt] != NULL);
if (requests[cnt] != NULL
&& list[cnt]->aio_lio_opcode != LIO_NOP)
{
#ifndef DONT_NEED_AIO_MISC_COND
waitlist->list[cnt].cond = NULL;
#endif
waitlist->list[cnt].result = NULL;
waitlist->list[cnt].next = requests[cnt]->waiting;
waitlist->list[cnt].counterp = &waitlist->counter;
waitlist->list[cnt].sigevp = &waitlist->sigev;
requests[cnt]->waiting = &waitlist->list[cnt];
++total;
}
}
waitlist->counter = total;
waitlist->sigev = *sig;
}
}
/* Release the mutex. */
pthread_mutex_unlock (&__aio_requests_mutex);
return result;
}
#if SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_4)
int
attribute_compat_text_section
__lio_listio_21 (int mode, struct aiocb *const list[], int nent,
struct sigevent *sig)
{
/* Check arguments. */
if (mode != LIO_WAIT && mode != LIO_NOWAIT)
{
__set_errno (EINVAL);
return -1;
}
return lio_listio_internal (mode | LIO_NO_INDIVIDUAL_EVENT, list, nent, sig);
}
compat_symbol (librt, __lio_listio_21, lio_listio, GLIBC_2_1);
#endif
int
__lio_listio_item_notify (int mode, struct aiocb *const list[], int nent,
struct sigevent *sig)
{
/* Check arguments. */
if (mode != LIO_WAIT && mode != LIO_NOWAIT)
{
__set_errno (EINVAL);
return -1;
}
return lio_listio_internal (mode, list, nent, sig);
}
versioned_symbol (librt, __lio_listio_item_notify, lio_listio, GLIBC_2_4);

33
sysdeps/pthread/lio_listio64.c
View File

@ -1,33 +0,0 @@
/* Enqueue and list of read or write requests, 64bit offset version.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <aio.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <aio_misc.h>
#define lio_listio lio_listio64
#define __lio_listio_21 __lio_listio64_21
#define __lio_listio_item_notify __lio_listio64_item_notify
#define aiocb aiocb64
#define LIO_OPCODE_BASE 128
#include <lio_listio.c>

166
sysdeps/pthread/timer_create.c
View File

@ -1,166 +0,0 @@
/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <signal.h>
#include <pthread.h>
#include <time.h>
#include <unistd.h>
#include "posix-timer.h"
/* Create new per-process timer using CLOCK. */
int
timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid)
{
int retval = -1;
struct timer_node *newtimer = NULL;
struct thread_node *thread = NULL;
if (0
#if defined _POSIX_CPUTIME && _POSIX_CPUTIME >= 0
|| clock_id == CLOCK_PROCESS_CPUTIME_ID
#endif
#if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
|| clock_id == CLOCK_THREAD_CPUTIME_ID
#endif
)
{
/* We don't allow timers for CPU clocks. At least not in the
moment. */
__set_errno (ENOTSUP);
return -1;
}
if (clock_id != CLOCK_REALTIME)
{
__set_errno (EINVAL);
return -1;
}
pthread_once (&__timer_init_once_control, __timer_init_once);
if (__timer_init_failed)
{
__set_errno (ENOMEM);
return -1;
}
pthread_mutex_lock (&__timer_mutex);
newtimer = __timer_alloc ();
if (__glibc_unlikely (newtimer == NULL))
{
__set_errno (EAGAIN);
goto unlock_bail;
}
if (evp != NULL)
newtimer->event = *evp;
else
{
newtimer->event.sigev_notify = SIGEV_SIGNAL;
newtimer->event.sigev_signo = SIGALRM;
newtimer->event.sigev_value.sival_ptr = newtimer;
newtimer->event.sigev_notify_function = 0;
}
newtimer->event.sigev_notify_attributes = &newtimer->attr;
newtimer->creator_pid = getpid ();
switch (__builtin_expect (newtimer->event.sigev_notify, SIGEV_SIGNAL))
{
case SIGEV_NONE:
case SIGEV_SIGNAL:
/* We have a global thread for delivering timed signals.
If it is not running, try to start it up. */
thread = &__timer_signal_thread_rclk;
if (! thread->exists)
{
if (__builtin_expect (__timer_thread_start (thread),
1) < 0)
{
__set_errno (EAGAIN);
goto unlock_bail;
}
}
break;
case SIGEV_THREAD:
/* Copy over thread attributes or set up default ones. */
if (evp->sigev_notify_attributes)
newtimer->attr = *(pthread_attr_t *) evp->sigev_notify_attributes;
else
pthread_attr_init (&newtimer->attr);
/* Ensure thread attributes call for deatched thread. */
pthread_attr_setdetachstate (&newtimer->attr, PTHREAD_CREATE_DETACHED);
/* Try to find existing thread having the right attributes. */
thread = __timer_thread_find_matching (&newtimer->attr, clock_id);
/* If no existing thread has these attributes, try to allocate one. */
if (thread == NULL)
thread = __timer_thread_alloc (&newtimer->attr, clock_id);
/* Out of luck; no threads are available. */
if (__glibc_unlikely (thread == NULL))
{
__set_errno (EAGAIN);
goto unlock_bail;
}
/* If the thread is not running already, try to start it. */
if (! thread->exists
&& __builtin_expect (! __timer_thread_start (thread), 0))
{
__set_errno (EAGAIN);
goto unlock_bail;
}
break;
default:
__set_errno (EINVAL);
goto unlock_bail;
}
newtimer->clock = clock_id;
newtimer->abstime = 0;
newtimer->armed = 0;
newtimer->thread = thread;
*timerid = timer_ptr2id (newtimer);
retval = 0;
if (__builtin_expect (retval, 0) == -1)
{
unlock_bail:
if (thread != NULL)
__timer_thread_dealloc (thread);
if (newtimer != NULL)
{
timer_delref (newtimer);
__timer_dealloc (newtimer);
}
}
pthread_mutex_unlock (&__timer_mutex);
return retval;
}

68
sysdeps/pthread/timer_delete.c
View File

@ -1,68 +0,0 @@
/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <errno.h>
#include <pthread.h>
#include <time.h>
#include "posix-timer.h"
/* Delete timer TIMERID. */
int
timer_delete (timer_t timerid)
{
struct timer_node *timer;
int retval = -1;
pthread_mutex_lock (&__timer_mutex);
timer = timer_id2ptr (timerid);
if (! timer_valid (timer))
/* Invalid timer ID or the timer is not in use. */
__set_errno (EINVAL);
else
{
if (timer->armed && timer->thread != NULL)
{
struct thread_node *thread = timer->thread;
assert (thread != NULL);
/* If thread is cancelled while waiting for handler to terminate,
the mutex is unlocked and timer_delete is aborted. */
pthread_cleanup_push (__timer_mutex_cancel_handler, &__timer_mutex);
/* If timer is currently being serviced, wait for it to finish. */
while (thread->current_timer == timer)
pthread_cond_wait (&thread->cond, &__timer_mutex);
pthread_cleanup_pop (0);
}
/* Remove timer from whatever queue it may be on and deallocate it. */
timer->inuse = TIMER_DELETED;
list_unlink_ip (&timer->links);
timer_delref (timer);
retval = 0;
}
pthread_mutex_unlock (&__timer_mutex);
return retval;
}

43
sysdeps/pthread/timer_getoverr.c
View File

@ -1,43 +0,0 @@
/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <time.h>
#include "posix-timer.h"
/* Get expiration overrun for timer TIMERID. */
int
timer_getoverrun (timer_t timerid)
{
struct timer_node *timer;
int retval = -1;
pthread_mutex_lock (&__timer_mutex);
if (! timer_valid (timer = timer_id2ptr (timerid)))
__set_errno (EINVAL);
else
retval = timer->overrun_count;
pthread_mutex_unlock (&__timer_mutex);
return retval;
}

74
sysdeps/pthread/timer_gettime.c
View File

@ -1,74 +0,0 @@
/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <time.h>
#include "posix-timer.h"
/* Get current value of timer TIMERID and store it in VLAUE. */
int
timer_gettime (timer_t timerid, struct itimerspec *value)
{
struct timer_node *timer;
struct timespec now, expiry;
int retval = -1, armed = 0, valid;
clock_t clock = 0;
pthread_mutex_lock (&__timer_mutex);
timer = timer_id2ptr (timerid);
valid = timer_valid (timer);
if (valid) {
armed = timer->armed;
expiry = timer->expirytime;
clock = timer->clock;
value->it_interval = timer->value.it_interval;
}
pthread_mutex_unlock (&__timer_mutex);
if (valid)
{
if (armed)
{
__clock_gettime (clock, &now);
if (timespec_compare (&now, &expiry) < 0)
timespec_sub (&value->it_value, &expiry, &now);
else
{
value->it_value.tv_sec = 0;
value->it_value.tv_nsec = 0;
}
}
else
{
value->it_value.tv_sec = 0;
value->it_value.tv_nsec = 0;
}
retval = 0;
}
else
__set_errno (EINVAL);
return retval;
}

131
sysdeps/pthread/timer_settime.c
View File

@ -1,131 +0,0 @@
/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <time.h>
#include "posix-timer.h"
/* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
int
timer_settime (timer_t timerid, int flags, const struct itimerspec *value,
struct itimerspec *ovalue)
{
struct timer_node *timer;
struct thread_node *thread = NULL;
struct timespec now;
int have_now = 0, need_wakeup = 0;
int retval = -1;
timer = timer_id2ptr (timerid);
if (timer == NULL)
{
__set_errno (EINVAL);
goto bail;
}
if (! valid_nanoseconds (value->it_interval.tv_nsec)
|| ! valid_nanoseconds (value->it_value.tv_nsec))
{
__set_errno (EINVAL);
goto bail;
}
/* Will need to know current time since this is a relative timer;
might as well make the system call outside of the lock now! */
if ((flags & TIMER_ABSTIME) == 0)
{
__clock_gettime (timer->clock, &now);
have_now = 1;
}
pthread_mutex_lock (&__timer_mutex);
timer_addref (timer);
/* One final check of timer validity; this one is possible only
until we have the mutex, because it accesses the inuse flag. */
if (! timer_valid(timer))
{
__set_errno (EINVAL);
goto unlock_bail;
}
if (ovalue != NULL)
{
ovalue->it_interval = timer->value.it_interval;
if (timer->armed)
{
if (! have_now)
{
pthread_mutex_unlock (&__timer_mutex);
__clock_gettime (timer->clock, &now);
have_now = 1;
pthread_mutex_lock (&__timer_mutex);
timer_addref (timer);
}
timespec_sub (&ovalue->it_value, &timer->expirytime, &now);
}
else
{
ovalue->it_value.tv_sec = 0;
ovalue->it_value.tv_nsec = 0;
}
}
timer->value = *value;
list_unlink_ip (&timer->links);
timer->armed = 0;
thread = timer->thread;
/* A value of { 0, 0 } causes the timer to be stopped. */
if (value->it_value.tv_sec != 0
|| __builtin_expect (value->it_value.tv_nsec != 0, 1))
{
if ((flags & TIMER_ABSTIME) != 0)
/* The user specified the expiration time. */
timer->expirytime = value->it_value;
else
timespec_add (&timer->expirytime, &now, &value->it_value);
/* Only need to wake up the thread if timer is inserted
at the head of the queue. */
if (thread != NULL)
need_wakeup = __timer_thread_queue_timer (thread, timer);
timer->armed = 1;
}
retval = 0;
unlock_bail:
timer_delref (timer);
pthread_mutex_unlock (&__timer_mutex);
bail:
if (thread != NULL && need_wakeup)
__timer_thread_wakeup (thread);
return retval;
}

4
sysdeps/unix/sysv/linux/alpha/aio_cancel.c
View File

@ -10,7 +10,7 @@ extern __typeof (aio_cancel) __old_aio_cancel;
#define aio_cancel __new_aio_cancel
#include <sysdeps/pthread/aio_cancel.c>
#include <rt/aio_cancel.c>
#undef aio_cancel
strong_alias (__new_aio_cancel, __new_aio_cancel64);
@ -23,7 +23,7 @@ versioned_symbol (librt, __new_aio_cancel64, aio_cancel64, GLIBC_2_3);
#define aio_cancel __old_aio_cancel
#define ECANCELED 125
#include <sysdeps/pthread/aio_cancel.c>
#include <rt/aio_cancel.c>
#undef aio_cancel
strong_alias (__old_aio_cancel, __old_aio_cancel64);

4
sysdeps/unix/sysv/linux/sparc/aio_cancel.c
View File

@ -10,7 +10,7 @@ extern __typeof (aio_cancel) __old_aio_cancel;
#define aio_cancel __new_aio_cancel
#include <sysdeps/pthread/aio_cancel.c>
#include <rt/aio_cancel.c>
#undef aio_cancel
strong_alias (__new_aio_cancel, __new_aio_cancel64);
@ -23,7 +23,7 @@ versioned_symbol (librt, __new_aio_cancel64, aio_cancel64, GLIBC_2_3);
#define aio_cancel __old_aio_cancel
#define ECANCELED 125
#include <sysdeps/pthread/aio_cancel.c>
#include <rt/aio_cancel.c>
#undef aio_cancel
strong_alias (__old_aio_cancel, __old_aio_cancel64);

2
sysdeps/unix/sysv/linux/wordsize-64/aio_read.c
View File

@ -1,6 +1,6 @@
#define aio_read64 __renamed_aio_read64
#include "../../../../pthread/aio_read.c"
#include <rt/aio_read.c>
#undef aio_read64

2
sysdeps/unix/sysv/linux/wordsize-64/aio_write.c
View File

@ -1,6 +1,6 @@
#define aio_write64 __renamed_aio_write64
#include "../../../../pthread/aio_write.c"
#include <rt/aio_write.c>
#undef aio_write64

2
sysdeps/unix/sysv/linux/wordsize-64/lio_listio.c
View File

@ -1,6 +1,6 @@
#define lio_listio64 __renamed_lio_listio64
#include "../../../../pthread/lio_listio.c"
#include <rt/lio_listio.c>
#undef lio_listio64