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Fix sparc semaphore implementation after recent changes.

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* sysdeps/sparc/nptl/sem_init.c: Delete.
	* sysdeps/sparc/nptl/sem_post.c: Delete.
	* sysdeps/sparc/nptl/sem_timedwait.c: Delete.
	* sysdeps/sparc/nptl/sem_wait.c: Delete.
	* sysdeps/sparc/sparc32/sem_init.c: New file.
	* sysdeps/sparc/sparc32/sem_waitcommon.c: New file.
	* sysdeps/sparc/sparc32/sem_open.c: Generic nptl version with
	padding explicitly initialized.
	* sysdeps/sparc/sparc32/sem_post.c: Generic nptl version using
	padding for in-semaphore spinlock.
	* sysdeps/sparc/sparc32/sem_wait.c: Likewise.
	* sysdeps/sparc/sparc32/sem_trywait.c: Delete.
	* sysdeps/sparc/sparc32/sem_timedwait.c: Delete.
	* sysdeps/sparc/sparc32/sparcv9/sem_init.c: New file.
	* sysdeps/sparc/sparc32/sparcv9/sem_open.c: New file.
	* sysdeps/sparc/sparc32/sparcv9/sem_post.c: New file.
	* sysdeps/sparc/sparc32/sparcv9/sem_waitcommon.c: New file.
	* sysdeps/sparc/sparc32/sparcv9/sem_wait.c: Redirect to nptl
	version.
	* sysdeps/sparc/sparc32/sparcv9/sem_timedwait.c: Delete.
	* sysdeps/sparc/sparc32/sparcv9/sem_trywait.c: Delete.
This commit is contained in:
David S. Miller 2015-01-31 18:59:40 -08:00
parent 5f3d0b78e0
commit d4abeca504
18 changed files with 692 additions and 703 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
ChangeLog
View File

@ -1,3 +1,27 @@
2015-01-31 David S. Miller <davem@davemloft.net>
* sysdeps/sparc/nptl/sem_init.c: Delete.
* sysdeps/sparc/nptl/sem_post.c: Delete.
* sysdeps/sparc/nptl/sem_timedwait.c: Delete.
* sysdeps/sparc/nptl/sem_wait.c: Delete.
* sysdeps/sparc/sparc32/sem_init.c: New file.
* sysdeps/sparc/sparc32/sem_waitcommon.c: New file.
* sysdeps/sparc/sparc32/sem_open.c: Generic nptl version with
padding explicitly initialized.
* sysdeps/sparc/sparc32/sem_post.c: Generic nptl version using
padding for in-semaphore spinlock.
* sysdeps/sparc/sparc32/sem_wait.c: Likewise.
* sysdeps/sparc/sparc32/sem_trywait.c: Delete.
* sysdeps/sparc/sparc32/sem_timedwait.c: Delete.
* sysdeps/sparc/sparc32/sparcv9/sem_init.c: New file.
* sysdeps/sparc/sparc32/sparcv9/sem_open.c: New file.
* sysdeps/sparc/sparc32/sparcv9/sem_post.c: New file.
* sysdeps/sparc/sparc32/sparcv9/sem_waitcommon.c: New file.
* sysdeps/sparc/sparc32/sparcv9/sem_wait.c: Redirect to nptl
version.
* sysdeps/sparc/sparc32/sparcv9/sem_timedwait.c: Delete.
* sysdeps/sparc/sparc32/sparcv9/sem_trywait.c: Delete.
2015-01-30 H.J. Lu <hongjiu.lu@intel.com>
[BZ #17801]

70
sysdeps/sparc/nptl/sem_post.c
View File

@ -1,70 +0,0 @@
/* sem_post -- post to a POSIX semaphore. SPARC version.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <shlib-compat.h>
#include <sparc-nptl.h>
int
__new_sem_post (sem_t *sem)
{
struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
atomic_increment (&isem->value);
atomic_full_barrier ();
if (isem->nwaiters > 0)
{
int err = lll_futex_wake (&isem->value, 1,
isem->private ^ FUTEX_PRIVATE_FLAG);
if (__builtin_expect (err, 0) < 0)
{
__set_errno (-err);
return -1;
}
}
return 0;
}
versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1);
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
int
attribute_compat_text_section
__old_sem_post (sem_t *sem)
{
struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
int err;
atomic_increment (&isem->value);
err = lll_futex_wake (&isem->value, 1,
isem->private ^ FUTEX_PRIVATE_FLAG);
if (__builtin_expect (err, 0) < 0)
{
__set_errno (-err);
return -1;
}
return 0;
}
compat_symbol (libpthread, __old_sem_post, sem_post, GLIBC_2_0);
#endif

116
sysdeps/sparc/nptl/sem_timedwait.c
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@ -1,116 +0,0 @@
/* sem_timedwait -- wait on a semaphore. Generic futex-using version.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <pthreadP.h>
#include <shlib-compat.h>
#include <sparc-nptl.h>
extern void __sem_wait_cleanup (void *arg) attribute_hidden;
/* This is in a seperate function in order to make sure gcc
puts the call site into an exception region, and thus the
cleanups get properly run. */
static int
__attribute__ ((noinline))
do_futex_timed_wait (struct sparc_new_sem *isem, struct timespec *rt)
{
int err, oldtype = __pthread_enable_asynccancel ();
err = lll_futex_timed_wait (&isem->value, 0, rt,
isem->private ^ FUTEX_PRIVATE_FLAG);
__pthread_disable_asynccancel (oldtype);
return err;
}
int
sem_timedwait (sem_t *sem, const struct timespec *abstime)
{
struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
int err;
if (atomic_decrement_if_positive (&isem->value) > 0)
return 0;
if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
{
__set_errno (EINVAL);
return -1;
}
atomic_increment (&isem->nwaiters);
pthread_cleanup_push (__sem_wait_cleanup, isem);
while (1)
{
struct timeval tv;
struct timespec rt;
int sec, nsec;
/* Get the current time. */
__gettimeofday (&tv, NULL);
/* Compute relative timeout. */
sec = abstime->tv_sec - tv.tv_sec;
nsec = abstime->tv_nsec - tv.tv_usec * 1000;
if (nsec < 0)
{
nsec += 1000000000;
--sec;
}
/* Already timed out? */
if (sec < 0)
{
__set_errno (ETIMEDOUT);
err = -1;
break;
}
/* Do wait. */
rt.tv_sec = sec;
rt.tv_nsec = nsec;
err = do_futex_timed_wait(isem, &rt);
if (err != 0 && err != -EWOULDBLOCK)
{
__set_errno (-err);
err = -1;
break;
}
if (atomic_decrement_if_positive (&isem->value) > 0)
{
err = 0;
break;
}
}
pthread_cleanup_pop (0);
atomic_decrement (&isem->nwaiters);
return err;
}

122
sysdeps/sparc/nptl/sem_wait.c
View File

@ -1,122 +0,0 @@
/* sem_wait -- wait on a semaphore. Generic futex-using version.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <pthreadP.h>
#include <shlib-compat.h>
#include <sparc-nptl.h>
void
attribute_hidden
__sem_wait_cleanup (void *arg)
{
struct sparc_new_sem *isem = (struct sparc_new_sem *) arg;
atomic_decrement (&isem->nwaiters);
}
/* This is in a seperate function in order to make sure gcc
puts the call site into an exception region, and thus the
cleanups get properly run. */
static int
__attribute__ ((noinline))
do_futex_wait (struct sparc_new_sem *isem)
{
int err, oldtype = __pthread_enable_asynccancel ();
err = lll_futex_wait (&isem->value, 0, isem->private ^ FUTEX_PRIVATE_FLAG);
__pthread_disable_asynccancel (oldtype);
return err;
}
int
__new_sem_wait (sem_t *sem)
{
struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
int err;
if (atomic_decrement_if_positive (&isem->value) > 0)
return 0;
atomic_increment (&isem->nwaiters);
pthread_cleanup_push (__sem_wait_cleanup, isem);
while (1)
{
err = do_futex_wait(isem);
if (err != 0 && err != -EWOULDBLOCK)
{
__set_errno (-err);
err = -1;
break;
}
if (atomic_decrement_if_positive (&isem->value) > 0)
{
err = 0;
break;
}
}
pthread_cleanup_pop (0);
atomic_decrement (&isem->nwaiters);
return err;
}
versioned_symbol (libpthread, __new_sem_wait, sem_wait, GLIBC_2_1);
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
int
attribute_compat_text_section
__old_sem_wait (sem_t *sem)
{
struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
int err;
do
{
if (atomic_decrement_if_positive (&isem->value) > 0)
return 0;
/* Enable asynchronous cancellation. Required by the standard. */
int oldtype = __pthread_enable_asynccancel ();
err = lll_futex_wait (&isem->value, 0,
isem->private ^ FUTEX_PRIVATE_FLAG);
/* Disable asynchronous cancellation. */
__pthread_disable_asynccancel (oldtype);
}
while (err == 0 || err == -EWOULDBLOCK);
__set_errno (-err);
return -1;
}
compat_symbol (libpthread, __old_sem_wait, sem_wait, GLIBC_2_0);
#endif

53
sysdeps/sparc/nptl/sem_init.c → sysdeps/sparc/sparc32/sem_init.c
View File

@ -17,19 +17,30 @@
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <string.h>
#include <semaphore.h>
#include <lowlevellock.h>
#include <shlib-compat.h>
#include "semaphoreP.h"
#include <kernel-features.h>
#include <sparc-nptl.h>
/* Returns FUTEX_PRIVATE if pshared is zero and private futexes are supported;
returns FUTEX_SHARED otherwise.
TODO Remove when cleaning up the futex API throughout glibc. */
static __always_inline int
futex_private_if_supported (int pshared)
{
if (pshared != 0)
return LLL_SHARED;
#ifdef __ASSUME_PRIVATE_FUTEX
return LLL_PRIVATE;
#else
return THREAD_GETMEM (THREAD_SELF, header.private_futex)
^ FUTEX_PRIVATE_FLAG;
#endif
}
int
__new_sem_init (sem, pshared, value)
sem_t *sem;
int pshared;
unsigned int value;
__new_sem_init (sem_t *sem, int pshared, unsigned int value)
{
/* Parameter sanity check. */
if (__glibc_unlikely (value > SEM_VALUE_MAX))
@ -39,17 +50,14 @@ __new_sem_init (sem, pshared, value)
}
/* Map to the internal type. */
struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
struct new_sem *isem = (struct new_sem *) sem;
/* Use the values the user provided. */
memset (isem, '\0', sizeof (*isem));
isem->value = value;
#ifdef __ASSUME_PRIVATE_FUTEX
isem->private = pshared ? 0 : FUTEX_PRIVATE_FLAG;
#else
isem->private = pshared ? 0 : THREAD_GETMEM (THREAD_SELF,
header.private_futex);
#endif
/* Use the values the caller provided. */
isem->value = value << SEM_VALUE_SHIFT;
isem->pad = 0;
isem->nwaiters = 0;
isem->private = futex_private_if_supported (pshared);
return 0;
}
@ -73,18 +81,13 @@ __old_sem_init (sem, pshared, value)
}
/* Map to the internal type. */
struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
struct old_sem *isem = (struct old_sem *) sem;
/* Use the value the user provided. */
memset (isem, '\0', sizeof (*isem));
isem->value = value;
#ifdef __ASSUME_PRIVATE_FUTEX
isem->private = pshared ? 0 : FUTEX_PRIVATE_FLAG;
#else
isem->private = pshared ? 0 : THREAD_GETMEM (THREAD_SELF,
header.private_futex);
#endif
/* We cannot store the PSHARED attribute. So we always use the
operations needed for shared semaphores. */
return 0;
}

298
sysdeps/sparc/sparc32/sem_open.c Normal file
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@ -0,0 +1,298 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <search.h>
#include <semaphore.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "semaphoreP.h"
#include <shm-directory.h>
/* Comparison function for search of existing mapping. */
int
attribute_hidden
__sem_search (const void *a, const void *b)
{
const struct inuse_sem *as = (const struct inuse_sem *) a;
const struct inuse_sem *bs = (const struct inuse_sem *) b;
if (as->ino != bs->ino)
/* Cannot return the difference the type is larger than int. */
return as->ino < bs->ino ? -1 : (as->ino == bs->ino ? 0 : 1);
if (as->dev != bs->dev)
/* Cannot return the difference the type is larger than int. */
return as->dev < bs->dev ? -1 : (as->dev == bs->dev ? 0 : 1);
return strcmp (as->name, bs->name);
}
/* The search tree for existing mappings. */
void *__sem_mappings attribute_hidden;
/* Lock to protect the search tree. */
int __sem_mappings_lock attribute_hidden = LLL_LOCK_INITIALIZER;
/* Search for existing mapping and if possible add the one provided. */
static sem_t *
check_add_mapping (const char *name, size_t namelen, int fd, sem_t *existing)
{
sem_t *result = SEM_FAILED;
/* Get the information about the file. */
struct stat64 st;
if (__fxstat64 (_STAT_VER, fd, &st) == 0)
{
/* Get the lock. */
lll_lock (__sem_mappings_lock, LLL_PRIVATE);
/* Search for an existing mapping given the information we have. */
struct inuse_sem *fake;
fake = (struct inuse_sem *) alloca (sizeof (*fake) + namelen);
memcpy (fake->name, name, namelen);
fake->dev = st.st_dev;
fake->ino = st.st_ino;
struct inuse_sem **foundp = tfind (fake, &__sem_mappings, __sem_search);
if (foundp != NULL)
{
/* There is already a mapping. Use it. */
result = (*foundp)->sem;
++(*foundp)->refcnt;
}
else
{
/* We haven't found a mapping. Install ione. */
struct inuse_sem *newp;
newp = (struct inuse_sem *) malloc (sizeof (*newp) + namelen);
if (newp != NULL)
{
/* If the caller hasn't provided any map it now. */
if (existing == SEM_FAILED)
existing = (sem_t *) mmap (NULL, sizeof (sem_t),
PROT_READ | PROT_WRITE, MAP_SHARED,
fd, 0);
newp->dev = st.st_dev;
newp->ino = st.st_ino;
newp->refcnt = 1;
newp->sem = existing;
memcpy (newp->name, name, namelen);
/* Insert the new value. */
if (existing != MAP_FAILED
&& tsearch (newp, &__sem_mappings, __sem_search) != NULL)
/* Successful. */
result = existing;
else
/* Something went wrong while inserting the new
value. We fail completely. */
free (newp);
}
}
/* Release the lock. */
lll_unlock (__sem_mappings_lock, LLL_PRIVATE);
}
if (result != existing && existing != SEM_FAILED && existing != MAP_FAILED)
{
/* Do not disturb errno. */
int save = errno;
munmap (existing, sizeof (sem_t));
errno = save;
}
return result;
}
sem_t *
sem_open (const char *name, int oflag, ...)
{
int fd;
sem_t *result;
/* Create the name of the final file in local variable SHM_NAME. */
SHM_GET_NAME (EINVAL, SEM_FAILED, SEM_SHM_PREFIX);
/* If the semaphore object has to exist simply open it. */
if ((oflag & O_CREAT) == 0 || (oflag & O_EXCL) == 0)
{
try_again:
fd = __libc_open (shm_name,
(oflag & ~(O_CREAT|O_ACCMODE)) | O_NOFOLLOW | O_RDWR);
if (fd == -1)
{
/* If we are supposed to create the file try this next. */
if ((oflag & O_CREAT) != 0 && errno == ENOENT)
goto try_create;
/* Return. errno is already set. */
}
else
/* Check whether we already have this semaphore mapped and
create one if necessary. */
result = check_add_mapping (name, namelen, fd, SEM_FAILED);
}
else
{
/* We have to open a temporary file first since it must have the
correct form before we can start using it. */
char *tmpfname;
mode_t mode;
unsigned int value;
va_list ap;
try_create:
va_start (ap, oflag);
mode = va_arg (ap, mode_t);
value = va_arg (ap, unsigned int);
va_end (ap);
if (value > SEM_VALUE_MAX)
{
__set_errno (EINVAL);
return SEM_FAILED;
}
/* Create the initial file content. */
union
{
sem_t initsem;
struct new_sem newsem;
} sem;
sem.newsem.value = value << SEM_VALUE_SHIFT;
sem.newsem.pad = 0;
sem.newsem.nwaiters = 0;
/* This always is a shared semaphore. */
sem.newsem.private = LLL_SHARED;
/* Initialize the remaining bytes as well. */
memset ((char *) &sem.initsem + sizeof (struct new_sem), '\0',
sizeof (sem_t) - sizeof (struct new_sem));
tmpfname = __alloca (shm_dirlen + sizeof SEM_SHM_PREFIX + 6);
char *xxxxxx = __mempcpy (tmpfname, shm_dir, shm_dirlen);
int retries = 0;
#define NRETRIES 50
while (1)
{
/* Add the suffix for mktemp. */
strcpy (xxxxxx, "XXXXXX");
/* We really want to use mktemp here. We cannot use mkstemp
since the file must be opened with a specific mode. The
mode cannot later be set since then we cannot apply the
file create mask. */
if (__mktemp (tmpfname) == NULL)
return SEM_FAILED;
/* Open the file. Make sure we do not overwrite anything. */
fd = __libc_open (tmpfname, O_RDWR | O_CREAT | O_EXCL, mode);
if (fd == -1)
{
if (errno == EEXIST)
{
if (++retries < NRETRIES)
continue;
__set_errno (EAGAIN);
}
return SEM_FAILED;
}
/* We got a file. */
break;
}
if (TEMP_FAILURE_RETRY (__libc_write (fd, &sem.initsem, sizeof (sem_t)))
== sizeof (sem_t)
/* Map the sem_t structure from the file. */
&& (result = (sem_t *) mmap (NULL, sizeof (sem_t),
PROT_READ | PROT_WRITE, MAP_SHARED,
fd, 0)) != MAP_FAILED)
{
/* Create the file. Don't overwrite an existing file. */
if (link (tmpfname, shm_name) != 0)
{
/* Undo the mapping. */
(void) munmap (result, sizeof (sem_t));
/* Reinitialize 'result'. */
result = SEM_FAILED;
/* This failed. If O_EXCL is not set and the problem was
that the file exists, try again. */
if ((oflag & O_EXCL) == 0 && errno == EEXIST)
{
/* Remove the file. */
(void) unlink (tmpfname);
/* Close the file. */
(void) __libc_close (fd);
goto try_again;
}
}
else
/* Insert the mapping into the search tree. This also
determines whether another thread sneaked by and already
added such a mapping despite the fact that we created it. */
result = check_add_mapping (name, namelen, fd, result);
}
/* Now remove the temporary name. This should never fail. If
it fails we leak a file name. Better fix the kernel. */
(void) unlink (tmpfname);
}
/* Map the mmap error to the error we need. */
if (MAP_FAILED != (void *) SEM_FAILED && result == MAP_FAILED)
result = SEM_FAILED;
/* We don't need the file descriptor anymore. */
if (fd != -1)
{
/* Do not disturb errno. */
int save = errno;
__libc_close (fd);
errno = save;
}
return result;
}

87
sysdeps/sparc/sparc32/sem_post.c
View File

@ -1,4 +1,4 @@
/* sem_post -- post to a POSIX semaphore. SPARC version.
/* sem_post -- post to a POSIX semaphore. Generic futex-using version.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
@ -17,6 +17,7 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <atomic.h>
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
@ -24,33 +25,58 @@
#include <semaphore.h>
#include <shlib-compat.h>
#include <sparc-nptl.h>
/* Wrapper for lll_futex_wake, with error checking.
TODO Remove when cleaning up the futex API throughout glibc. */
static __always_inline void
futex_wake (unsigned int* futex, int processes_to_wake, int private)
{
int res = lll_futex_wake (futex, processes_to_wake, private);
/* No error. Ignore the number of woken processes. */
if (res >= 0)
return;
switch (res)
{
case -EFAULT: /* Could have happened due to memory reuse. */
case -EINVAL: /* Could be either due to incorrect alignment (a bug in
glibc or in the application) or due to memory being
reused for a PI futex. We cannot distinguish between the
two causes, and one of them is correct use, so we do not
act in this case. */
return;
case -ENOSYS: /* Must have been caused by a glibc bug. */
/* No other errors are documented at this time. */
default:
abort ();
}
}
/* See sem_wait for an explanation of the algorithm. */
int
__new_sem_post (sem_t *sem)
{
struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
int nr;
struct new_sem *isem = (struct new_sem *) sem;
int private = isem->private;
unsigned int v;
if (__atomic_is_v9)
nr = atomic_increment_val (&isem->value);
else
__sparc32_atomic_do_lock24(&isem->pad);
v = isem->value;
if ((v << SEM_VALUE_SHIFT) == SEM_VALUE_MAX)
{
__sparc32_atomic_do_lock24 (&isem->lock);
nr = ++(isem->value);
__sparc32_atomic_do_unlock24 (&isem->lock);
}
atomic_full_barrier ();
if (isem->nwaiters > 0)
{
int err = lll_futex_wake (&isem->value, 1,
isem->private ^ FUTEX_PRIVATE_FLAG);
if (__builtin_expect (err, 0) < 0)
{
__set_errno (-err);
return -1;
}
__sparc32_atomic_do_unlock24(&isem->pad);
__set_errno (EOVERFLOW);
return -1;
}
isem->value = v + (1 << SEM_VALUE_SHIFT);
__sparc32_atomic_do_unlock24(&isem->pad);
if ((v & SEM_NWAITERS_MASK) != 0)
futex_wake (&isem->value, 1, private);
return 0;
}
versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1);
@ -61,19 +87,14 @@ int
attribute_compat_text_section
__old_sem_post (sem_t *sem)
{
struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
int nr;
int *futex = (int *) sem;
if (__atomic_is_v9)
nr = atomic_increment_val (&isem->value);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
nr = ++(isem->value);
__sparc32_atomic_do_unlock24 (&isem->lock);
}
int err = lll_futex_wake (&isem->value, 1,
isem->private ^ FUTEX_PRIVATE_FLAG);
/* We must need to synchronize with consumers of this token, so the atomic
increment must have release MO semantics. */
atomic_write_barrier ();
(void) atomic_increment_val (futex);
/* We always have to assume it is a shared semaphore. */
int err = lll_futex_wake (futex, 1, LLL_SHARED);
if (__builtin_expect (err, 0) < 0)
{
__set_errno (-err);

153
sysdeps/sparc/sparc32/sem_timedwait.c
View File

@ -1,153 +0,0 @@
/* sem_timedwait -- wait on a semaphore. SPARC version.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <pthreadP.h>
#include <shlib-compat.h>
#include <sparc-nptl.h>
extern void __sem_wait_cleanup (void *arg) attribute_hidden;
/* This is in a seperate function in order to make sure gcc
puts the call site into an exception region, and thus the
cleanups get properly run. */
static int
__attribute__ ((noinline))
do_futex_timed_wait (struct sparc_new_sem *isem, struct timespec *rt)
{
int err, oldtype = __pthread_enable_asynccancel ();
err = lll_futex_timed_wait (&isem->value, 0, rt,
isem->private ^ FUTEX_PRIVATE_FLAG);
__pthread_disable_asynccancel (oldtype);
return err;
}
int
sem_timedwait (sem_t *sem, const struct timespec *abstime)
{
struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
int err;
int val;
if (__atomic_is_v9)
val = atomic_decrement_if_positive (&isem->value);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
val = isem->value;
if (val > 0)
isem->value = val - 1;
__sparc32_atomic_do_unlock24 (&isem->lock);
}
if (val > 0)
return 0;
if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
{
__set_errno (EINVAL);
return -1;
}
if (__atomic_is_v9)
atomic_increment (&isem->nwaiters);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
isem->nwaiters++;
__sparc32_atomic_do_unlock24 (&isem->lock);
}
pthread_cleanup_push (__sem_wait_cleanup, isem);
while (1)
{
struct timeval tv;
struct timespec rt;
int sec, nsec;
/* Get the current time. */
__gettimeofday (&tv, NULL);
/* Compute relative timeout. */
sec = abstime->tv_sec - tv.tv_sec;
nsec = abstime->tv_nsec - tv.tv_usec * 1000;
if (nsec < 0)
{
nsec += 1000000000;
--sec;
}
/* Already timed out? */
if (sec < 0)
{
__set_errno (ETIMEDOUT);
err = -1;
break;
}
/* Do wait. */
rt.tv_sec = sec;
rt.tv_nsec = nsec;
err = do_futex_timed_wait(isem, &rt);
if (err != 0 && err != -EWOULDBLOCK)
{
__set_errno (-err);
err = -1;
break;
}
if (__atomic_is_v9)
val = atomic_decrement_if_positive (&isem->value);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
val = isem->value;
if (val > 0)
isem->value = val - 1;
__sparc32_atomic_do_unlock24 (&isem->lock);
}
if (val > 0)
{
err = 0;
break;
}
}
pthread_cleanup_pop (0);
if (__atomic_is_v9)
atomic_decrement (&isem->nwaiters);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
isem->nwaiters--;
__sparc32_atomic_do_unlock24 (&isem->lock);
}
return err;
}

58
sysdeps/sparc/sparc32/sem_trywait.c
View File

@ -1,58 +0,0 @@
/* sem_trywait -- wait on a semaphore. SPARC version.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <shlib-compat.h>
int
__new_sem_trywait (sem_t *sem)
{
struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
int val;
if (isem->value > 0)
{
if (__atomic_is_v9)
val = atomic_decrement_if_positive (&isem->value);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
val = isem->value;
if (val > 0)
isem->value = val - 1;
__sparc32_atomic_do_unlock24 (&isem->lock);
}
if (val > 0)
return 0;
}
__set_errno (EAGAIN);
return -1;
}
versioned_symbol (libpthread, __new_sem_trywait, sem_trywait, GLIBC_2_1);
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
strong_alias (__new_sem_trywait, __old_sem_trywait)
compat_symbol (libpthread, __old_sem_trywait, sem_trywait, GLIBC_2_0);
#endif

160
sysdeps/sparc/sparc32/sem_wait.c
View File

@ -17,151 +17,36 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <pthreadP.h>
#include <shlib-compat.h>
#include <sparc-nptl.h>
void
attribute_hidden
__sem_wait_cleanup (void *arg)
{
struct sparc_new_sem *isem = (struct sparc_new_sem *) arg;
if (__atomic_is_v9)
atomic_decrement (&isem->nwaiters);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
isem->nwaiters--;
__sparc32_atomic_do_unlock24 (&isem->lock);
}
}
/* This is in a seperate function in order to make sure gcc
puts the call site into an exception region, and thus the
cleanups get properly run. */
static int
__attribute__ ((noinline))
do_futex_wait (struct sparc_new_sem *isem)
{
int err, oldtype = __pthread_enable_asynccancel ();
err = lll_futex_wait (&isem->value, 0, isem->private ^ FUTEX_PRIVATE_FLAG);
__pthread_disable_asynccancel (oldtype);
return err;
}
#include "sem_waitcommon.c"
int
__new_sem_wait (sem_t *sem)
{
struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
int err;
int val;
if (__atomic_is_v9)
val = atomic_decrement_if_positive (&isem->value);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
val = isem->value;
if (val > 0)
isem->value = val - 1;
else
isem->nwaiters++;
__sparc32_atomic_do_unlock24 (&isem->lock);
}
if (val > 0)
if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
return 0;
if (__atomic_is_v9)
atomic_increment (&isem->nwaiters);
else
/* Already done above while still holding isem->lock. */;
pthread_cleanup_push (__sem_wait_cleanup, isem);
while (1)
{
err = do_futex_wait(isem);
if (err != 0 && err != -EWOULDBLOCK)
{
__set_errno (-err);
err = -1;
break;
}
if (__atomic_is_v9)
val = atomic_decrement_if_positive (&isem->value);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
val = isem->value;
if (val > 0)
isem->value = val - 1;
__sparc32_atomic_do_unlock24 (&isem->lock);
}
if (val > 0)
{
err = 0;
break;
}
}
pthread_cleanup_pop (0);
if (__atomic_is_v9)
atomic_decrement (&isem->nwaiters);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
isem->nwaiters--;
__sparc32_atomic_do_unlock24 (&isem->lock);
}
return err;
return __new_sem_wait_slow((struct new_sem *) sem, NULL);
}
versioned_symbol (libpthread, __new_sem_wait, sem_wait, GLIBC_2_1);
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
int
attribute_compat_text_section
__old_sem_wait (sem_t *sem)
{
struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
int *futex = (int *) sem;
int err;
int val;
do
{
if (__atomic_is_v9)
val = atomic_decrement_if_positive (&isem->value);
else
{
__sparc32_atomic_do_lock24 (&isem->lock);
val = isem->value;
if (val > 0)
isem->value = val - 1;
__sparc32_atomic_do_unlock24 (&isem->lock);
}
if (val > 0)
if (atomic_decrement_if_positive (futex) > 0)
return 0;
/* Enable asynchronous cancellation. Required by the standard. */
int oldtype = __pthread_enable_asynccancel ();
err = lll_futex_wait (&isem->value, 0,
isem->private ^ FUTEX_PRIVATE_FLAG);
/* Always assume the semaphore is shared. */
err = lll_futex_wait (futex, 0, LLL_SHARED);
/* Disable asynchronous cancellation. */
__pthread_disable_asynccancel (oldtype);
@ -174,3 +59,34 @@ __old_sem_wait (sem_t *sem)
compat_symbol (libpthread, __old_sem_wait, sem_wait, GLIBC_2_0);
#endif
int
__new_sem_trywait (sem_t *sem)
{
/* We must not fail spuriously, so require a definitive result even if this
may lead to a long execution time. */
if (__new_sem_wait_fast ((struct new_sem *) sem, 1) == 0)
return 0;
__set_errno (EAGAIN);
return -1;
}
versioned_symbol (libpthread, __new_sem_trywait, sem_trywait, GLIBC_2_1);
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
int
__old_sem_trywait (sem_t *sem)
{
int *futex = (int *) sem;
int val;
if (*futex > 0)
{
val = atomic_decrement_if_positive (futex);
if (val > 0)
return 0;
}
__set_errno (EAGAIN);
return -1;
}
compat_symbol (libpthread, __old_sem_trywait, sem_trywait, GLIBC_2_0);
#endif

245
sysdeps/sparc/sparc32/sem_waitcommon.c Normal file
View File

@ -0,0 +1,245 @@
/* sem_waitcommon -- wait on a semaphore, shared code.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <sys/time.h>
#include <pthreadP.h>
#include <shlib-compat.h>
#include <atomic.h>
/* Wrapper for lll_futex_wait with absolute timeout and error checking.
TODO Remove when cleaning up the futex API throughout glibc. */
static __always_inline int
futex_abstimed_wait (unsigned int* futex, unsigned int expected,
const struct timespec* abstime, int private, bool cancel)
{
int err, oldtype;
if (abstime == NULL)
{
if (cancel)
oldtype = __pthread_enable_asynccancel ();
err = lll_futex_wait (futex, expected, private);
if (cancel)
__pthread_disable_asynccancel (oldtype);
}
else
{
struct timeval tv;
struct timespec rt;
int sec, nsec;
/* Get the current time. */
__gettimeofday (&tv, NULL);
/* Compute relative timeout. */
sec = abstime->tv_sec - tv.tv_sec;
nsec = abstime->tv_nsec - tv.tv_usec * 1000;
if (nsec < 0)
{
nsec += 1000000000;
--sec;
}
/* Already timed out? */
if (sec < 0)
return ETIMEDOUT;
/* Do wait. */
rt.tv_sec = sec;
rt.tv_nsec = nsec;
if (cancel)
oldtype = __pthread_enable_asynccancel ();
err = lll_futex_timed_wait (futex, expected, &rt, private);
if (cancel)
__pthread_disable_asynccancel (oldtype);
}
switch (err)
{
case 0:
case -EAGAIN:
case -EINTR:
case -ETIMEDOUT:
return -err;
case -EFAULT: /* Must have been caused by a glibc or application bug. */
case -EINVAL: /* Either due to wrong alignment or due to the timeout not
being normalized. Must have been caused by a glibc or
application bug. */
case -ENOSYS: /* Must have been caused by a glibc bug. */
/* No other errors are documented at this time. */
default:
abort ();
}
}
/* Wrapper for lll_futex_wake, with error checking.
TODO Remove when cleaning up the futex API throughout glibc. */
static __always_inline void
futex_wake (unsigned int* futex, int processes_to_wake, int private)
{
int res = lll_futex_wake (futex, processes_to_wake, private);
/* No error. Ignore the number of woken processes. */
if (res >= 0)
return;
switch (res)
{
case -EFAULT: /* Could have happened due to memory reuse. */
case -EINVAL: /* Could be either due to incorrect alignment (a bug in
glibc or in the application) or due to memory being
reused for a PI futex. We cannot distinguish between the
two causes, and one of them is correct use, so we do not
act in this case. */
return;
case -ENOSYS: /* Must have been caused by a glibc bug. */
/* No other errors are documented at this time. */
default:
abort ();
}
}
/* Set this to true if you assume that, in contrast to current Linux futex
documentation, lll_futex_wake can return -EINTR only if interrupted by a
signal, not spuriously due to some other reason.
TODO Discuss EINTR conditions with the Linux kernel community. For
now, we set this to true to not change behavior of semaphores compared
to previous glibc builds. */
static const int sem_assume_only_signals_cause_futex_EINTR = 1;
static void
__sem_wait_32_finish (struct new_sem *sem);
static void
__sem_wait_cleanup (void *arg)
{
struct new_sem *sem = (struct new_sem *) arg;
__sem_wait_32_finish (sem);
}
/* Wait until at least one token is available, possibly with a timeout.
This is in a separate function in order to make sure gcc
puts the call site into an exception region, and thus the
cleanups get properly run. TODO still necessary? Other futex_wait
users don't seem to need it. */
static int
__attribute__ ((noinline))
do_futex_wait (struct new_sem *sem, const struct timespec *abstime)
{
int err;
err = futex_abstimed_wait (&sem->value, SEM_NWAITERS_MASK, abstime,
sem->private, true);
return err;
}
/* Fast path: Try to grab a token without blocking. */
static int
__new_sem_wait_fast (struct new_sem *sem, int definitive_result)
{
unsigned int v;
int ret = 0;
__sparc32_atomic_do_lock24(&sem->pad);
v = sem->value;
if ((v >> SEM_VALUE_SHIFT) == 0)
ret = -1;
else
sem->value = v - (1 << SEM_VALUE_SHIFT);
__sparc32_atomic_do_unlock24(&sem->pad);
return ret;
}
/* Slow path that blocks. */
static int
__attribute__ ((noinline))
__new_sem_wait_slow (struct new_sem *sem, const struct timespec *abstime)
{
unsigned int v;
int err = 0;
__sparc32_atomic_do_lock24(&sem->pad);
sem->nwaiters++;
pthread_cleanup_push (__sem_wait_cleanup, sem);
/* Wait for a token to be available. Retry until we can grab one. */
v = sem->value;
do
{
if (!(v & SEM_NWAITERS_MASK))
sem->value = v | SEM_NWAITERS_MASK;
/* If there is no token, wait. */
if ((v >> SEM_VALUE_SHIFT) == 0)
{
__sparc32_atomic_do_unlock24(&sem->pad);
err = do_futex_wait(sem, abstime);
if (err == ETIMEDOUT ||
(err == EINTR && sem_assume_only_signals_cause_futex_EINTR))
{
__set_errno (err);
err = -1;
goto error;
}
err = 0;
__sparc32_atomic_do_lock24(&sem->pad);
/* We blocked, so there might be a token now. */
v = sem->value;
}
}
/* If there is no token, we must not try to grab one. */
while ((v >> SEM_VALUE_SHIFT) == 0);
sem->value = v - (1 << SEM_VALUE_SHIFT);
__sparc32_atomic_do_unlock24(&sem->pad);
error:
pthread_cleanup_pop (0);
__sem_wait_32_finish (sem);
return err;
}
/* Stop being a registered waiter (non-64b-atomics code only). */
static void
__sem_wait_32_finish (struct new_sem *sem)
{
__sparc32_atomic_do_lock24(&sem->pad);
if (--sem->nwaiters == 0)
sem->value &= ~SEM_NWAITERS_MASK;
__sparc32_atomic_do_unlock24(&sem->pad);
}

1
sysdeps/sparc/sparc32/sparcv9/sem_init.c Normal file
View File

@ -0,0 +1 @@
#include <nptl/sem_init.c>

1
sysdeps/sparc/sparc32/sparcv9/sem_open.c Normal file
View File

@ -0,0 +1 @@
#include <nptl/sem_open.c>

2
sysdeps/sparc/sparc32/sparcv9/sem_post.c
View File

@ -1 +1 @@
#include <sysdeps/sparc/nptl/sem_post.c>
#include <nptl/sem_post.c>

1
sysdeps/sparc/sparc32/sparcv9/sem_timedwait.c
View File

@ -1 +0,0 @@
#include <sysdeps/sparc/nptl/sem_timedwait.c>

1
sysdeps/sparc/sparc32/sparcv9/sem_trywait.c
View File

@ -1 +0,0 @@
#include <nptl/sem_trywait.c>

2
sysdeps/sparc/sparc32/sparcv9/sem_wait.c
View File

@ -1 +1 @@
#include <sysdeps/sparc/nptl/sem_wait.c>
#include <nptl/sem_wait.c>

1
sysdeps/sparc/sparc32/sparcv9/sem_waitcommon.c Normal file
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@ -0,0 +1 @@
#include <nptl/sem_waitcommon.c>