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* sysdeps/pthread/aio_misc.h [!DONT_USE_BOOTSTRAP_MAP]

Browse Source 
(struct waitlist): Don't add cond.
	* sysdeps/pthread/aio_notify.c [!DONT_USE_BOOTSTRAP_MAP]
	(__aio_notify): Use AIO_MISC_NOTIFY instead of pthread_cond_signal.
	* sysdeps/pthread/aio_suspend.c [!DONT_USE_BOOTSTRAP_MAP]: Don't
	use condvar, use AIO_MISC_WAIT.
	* sysdeps/pthread/lio_listio.c: Likewise.
	* rt/Makefile (tests): Add aio_suspend.
	* rt/tst-aio9.c: New file.
This commit is contained in:
Ulrich Drepper 2006-01-06 03:08:04 +00:00
parent 17041e4ff0
commit 679d83bac2
11 changed files with 312 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
ChangeLog
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@ -1,5 +1,15 @@
2006-01-05 Ulrich Drepper <drepper@redhat.com>
* sysdeps/pthread/aio_misc.h [!DONT_USE_BOOTSTRAP_MAP]
(struct waitlist): Don't add cond.
* sysdeps/pthread/aio_notify.c [!DONT_USE_BOOTSTRAP_MAP]
(__aio_notify): Use AIO_MISC_NOTIFY instead of pthread_cond_signal.
* sysdeps/pthread/aio_suspend.c [!DONT_USE_BOOTSTRAP_MAP]: Don't
use condvar, use AIO_MISC_WAIT.
* sysdeps/pthread/lio_listio.c: Likewise.
* rt/Makefile (tests): Add aio_suspend.
* rt/tst-aio9.c: New file.
* rt/tst-aio3.c: The thread is now supposed to be created.
2006-01-05 Roland McGrath <roland@redhat.com>

8
nptl/ChangeLog
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@ -1,3 +1,11 @@
2006-01-05 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/i386/lowlevellock.h (lll_futex_wait):
Return status.
(lll_futex_timed_wait): Define.
* sysdeps/unix/sysv/linux/x86_64/lowlevellock.h: Likewise.
* sysdeps/pthread/aio_misc.h: New file.
2006-01-03 Joseph S. Myers <joseph@codesourcery.com>
* Makefile ($(objpfx)$(multidir)): Use mkdir -p.

73
nptl/sysdeps/pthread/aio_misc.h Normal file
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@ -0,0 +1,73 @@
/* Copyright (C) 2006 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* We define a special synchronization primitive for AIO. POSIX
conditional variables would be ideal but the pthread_cond_*wait
operations do not return on EINTR. This is a requirement for
correct aio_suspend and lio_listio implementations. */
#include <assert.h>
#include <pthreadP.h>
#include <lowlevellock.h>
#define DONT_NEED_AIO_MISC_COND 1
#define AIO_MISC_NOTIFY(waitlist) \
do { \
if (--*waitlist->counterp == 0) \
lll_futex_wake (waitlist->counterp, 1); \
} while (0)
#define AIO_MISC_WAIT(result, futex, timeout, cancel) \
do { \
int oldval = futex; \
\
if (oldval != 0) \
{ \
pthread_mutex_unlock (&__aio_requests_mutex); \
\
int oldtype; \
if (cancel) \
oldtype = LIBC_CANCEL_ASYNC (); \
\
int status; \
do \
{ \
status = lll_futex_timed_wait (&futex, oldval, timeout); \
if (status != -EWOULDBLOCK) \
break; \
\
oldval = futex; \
} \
while (oldval != 0); \
\
if (cancel) \
LIBC_CANCEL_RESET (oldtype); \
\
if (status == -EINTR) \
result = EINTR; \
else if (status == -ETIMEDOUT) \
result = EAGAIN; \
else \
assert (status == 0 || status == -EWOULDBLOCK); \
\
pthread_mutex_lock (&__aio_requests_mutex); \
} \
} while (0)
#include_next <aio_misc.h>

26
nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -66,17 +66,33 @@
#define lll_futex_wait(futex, val) \
do { \
int __ignore; \
({ \
int __status; \
register __typeof (val) _val asm ("edx") = (val); \
__asm __volatile (LLL_EBX_LOAD \
LLL_ENTER_KERNEL \
LLL_EBX_LOAD \
: "=a" (__ignore) \
: "=a" (__status) \
: "0" (SYS_futex), LLL_EBX_REG (futex), "S" (0), \
"c" (FUTEX_WAIT), "d" (_val), \
"i" (offsetof (tcbhead_t, sysinfo))); \
} while (0)
__status; \
})
#define lll_futex_timed_wait(futex, val, timeout) \
({ \
int __status; \
register __typeof (val) _val asm ("edx") = (val); \
__asm __volatile (LLL_EBX_LOAD \
LLL_ENTER_KERNEL \
LLL_EBX_LOAD \
: "=a" (__status) \
: "0" (SYS_futex), LLL_EBX_REG (futex), "S" (timeout), \
"c" (FUTEX_WAIT), "d" (_val), \
"i" (offsetof (tcbhead_t, sysinfo))); \
__status; \
})
#define lll_futex_wake(futex, nr) \

25
nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -47,16 +47,31 @@
#define lll_futex_wait(futex, val) \
do { \
int __ignore; \
({ \
int __status; \
register __typeof (val) _val asm ("edx") = (val); \
__asm __volatile ("xorq %%r10, %%r10\n\t" \
"syscall" \
: "=a" (__ignore) \
: "=a" (__status) \
: "0" (SYS_futex), "D" (futex), "S" (FUTEX_WAIT), \
"d" (_val) \
: "memory", "cc", "r10", "r11", "cx"); \
} while (0)
__status; \
})
#define lll_futex_timed_wait(futex, val, timeout) \
({ \
register const struct timespec *__to __asm__ ("r10") = timeout; \
int __status; \
register __typeof (val) _val asm ("edx") = (val); \
__asm __volatile ("syscall" \
: "=a" (__status) \
: "0" (SYS_futex), "D" (futex), "S" (FUTEX_WAIT), \
"d" (_val), "r" (__to) \
: "memory", "cc", "r11", "cx"); \
__status; \
})
#define lll_futex_wake(futex, nr) \

3
rt/Makefile
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@ -43,7 +43,8 @@ librt-routines = $(aio-routines) \
tests := tst-shm tst-clock tst-clock_nanosleep tst-timer tst-timer2 \
tst-aio tst-aio64 tst-aio2 tst-aio3 tst-aio4 tst-aio5 tst-aio6 \
tst-aio7 tst-aio8 tst-mqueue1 tst-mqueue2 tst-mqueue3 tst-mqueue4 \
tst-aio7 tst-aio8 tst-aio9 \
tst-mqueue1 tst-mqueue2 tst-mqueue3 tst-mqueue4 \
tst-mqueue5 tst-mqueue6 tst-mqueue7 tst-mqueue8 tst-mqueue9 \
tst-timer3 tst-timer4 tst-timer5 \
tst-cpuclock1 tst-cpuclock2 \

124
rt/tst-aio9.c Normal file
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@ -0,0 +1,124 @@
#include <aio.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
static pthread_barrier_t b;
static pthread_t main_thread;
static int flag;
static void *
tf (void *arg)
{
int e = pthread_barrier_wait (&b);
if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
{
puts ("child: barrier_wait failed");
exit (1);
}
/* There is unfortunately no other way to try to make sure the other
thread reached the aio_suspend call. This test could fail on
highly loaded machines. */
sleep (2);
pthread_kill (main_thread, SIGUSR1);
while (1)
sleep (1000);
return NULL;
}
static void
sh (int sig)
{
flag = 1;
}
static int
do_test (void)
{
main_thread = pthread_self ();
struct sigaction sa;
sa.sa_handler = sh;
sa.sa_flags = 0;
sigemptyset (&sa.sa_mask);
if (sigaction (SIGUSR1, &sa, NULL) != 0)
{
puts ("sigaction failed");
return 1;
}
if (pthread_barrier_init (&b, NULL, 2) != 0)
{
puts ("barrier_init");
return 1;
}
int fds[2];
if (pipe (fds) != 0)
{
puts ("pipe failed");
return 1;
}
char buf[42];
struct aiocb req;
req.aio_fildes = fds[0];
req.aio_reqprio = 0;
req.aio_offset = 0;
req.aio_buf = buf;
req.aio_nbytes = sizeof (buf);
req.aio_sigevent.sigev_notify = SIGEV_NONE;
if (aio_read (&req) != 0)
{
puts ("aio_read failed");
return 1;
}
pthread_t th;
if (pthread_create (&th, NULL, tf, NULL) != 0)
{
puts ("create failed");
return 1;
}
int e = pthread_barrier_wait (&b);
if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
{
puts ("parent: barrier_wait failed");
exit (1);
}
const struct aiocb *list[1];
list[0] = &req;
e = aio_suspend (list, 1, NULL);
if (e != -1)
{
puts ("aio_suspend succeeded");
return 1;
}
if (errno != EINTR)
{
puts ("aio_suspend did not return EINTR");
return 1;
}
return 0;
}
#define TEST_FUNCTION do_test ()
#define TIMEOUT 5
#include "../test-skeleton.c"

2
sysdeps/pthread/aio_misc.h
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@ -47,7 +47,9 @@ 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 int *counterp;

12
sysdeps/pthread/aio_notify.c
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@ -143,20 +143,24 @@ __aio_notify (struct requestlist *req)
{
struct waitlist *next = waitlist->next;
/* Decrement the counter. This is used in both cases. */
--*waitlist->counterp;
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 a asynchronous `lio_listio' operation. If
this request is the last one, send the signal. */
if (*waitlist->counterp == 0)
if (--*waitlist->counterp == 0)
{
#ifdef BROKEN_THREAD_SIGNALS
__aio_notify_only (waitlist->sigevp, waitlist->caller_pid);

36
sysdeps/pthread/aio_suspend.c
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@ -44,7 +44,9 @@ 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;
};
@ -52,6 +54,12 @@ struct clparam
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
@ -75,8 +83,10 @@ cleanup (void *arg)
*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);
@ -89,13 +99,21 @@ aio_suspend (list, nent, timeout)
int nent;
const struct timespec *timeout;
{
if (__builtin_expect (nent < 0, 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;
int dummy;
int cntr = 1;
/* Request the mutex. */
pthread_mutex_lock (&__aio_requests_mutex);
@ -111,10 +129,12 @@ aio_suspend (list, nent, timeout)
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 = &dummy;
waitlist[cnt].counterp = &cntr;
waitlist[cnt].sigevp = NULL;
#ifdef BROKEN_THREAD_SIGNALS
waitlist[cnt].caller_pid = 0; /* Not needed. */
@ -140,12 +160,17 @@ aio_suspend (list, nent, timeout)
.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
AIO_MISC_WAIT (result, cntr, timeout, 1);
#else
if (timeout == NULL)
result = pthread_cond_wait (&cond, &__aio_requests_mutex);
else
@ -167,6 +192,7 @@ aio_suspend (list, nent, timeout)
result = pthread_cond_timedwait (&cond, &__aio_requests_mutex,
&abstime);
}
#endif
pthread_cleanup_pop (0);
}
@ -190,19 +216,23 @@ aio_suspend (list, nent, timeout)
*listp = (*listp)->next;
}
#ifndef DONT_NEED_AIO_MISC_COND
/* Release the conditional variable. */
if (__builtin_expect (pthread_cond_destroy (&cond) != 0, 0))
/* This must never happen. */
abort ();
#endif
if (result != 0)
{
/* An error occurred. Possibly it's EINTR. We have to translate
#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;

12
sysdeps/pthread/lio_listio.c
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@ -122,9 +122,11 @@ lio_listio_internal (int mode, struct aiocb *const list[], int nent,
}
else if (LIO_MODE (mode) == LIO_WAIT)
{
#ifndef DONT_NEED_AIO_MISC_COND
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
struct waitlist waitlist[nent];
int oldstate;
#endif
struct waitlist waitlist[nent];
total = 0;
for (cnt = 0; cnt < nent; ++cnt)
@ -133,7 +135,9 @@ lio_listio_internal (int mode, struct aiocb *const list[], int nent,
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;
@ -146,6 +150,9 @@ lio_listio_internal (int mode, struct aiocb *const list[], int nent,
}
}
#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. */
@ -161,6 +168,7 @@ lio_listio_internal (int mode, struct aiocb *const list[], int nent,
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)
@ -193,7 +201,9 @@ lio_listio_internal (int mode, struct aiocb *const list[], int nent,
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;