mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 15:30:07 +00:00
ff48874d6a
2003-12-11 Ulrich Drepper <drepper@redhat.com> * sysdeps/unix/sysv/linux/i386/lowlevellock.h (lll_futex_wait): Assume parameter is a pointer. (lll_futex_wake): Likewise. Reported by Boris Hu. * sysdeps/unix/sysv/linux/unregister-atfork.c (__unregister_atfork): Pass pointer to refcntr to lll_futex_wait. * sysdeps/unix/sysv/linux/sem_wait.c (__new_sem_wait): Simplify a bit.
64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/* sem_wait -- wait on a semaphore. Generic futex-using version.
|
|
Copyright (C) 2003 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <errno.h>
|
|
#include <sysdep.h>
|
|
#include <lowlevellock.h>
|
|
#include <internaltypes.h>
|
|
#include <semaphore.h>
|
|
|
|
#include <pthreadP.h>
|
|
#include <shlib-compat.h>
|
|
|
|
|
|
int
|
|
__new_sem_wait (sem_t *sem)
|
|
{
|
|
/* First check for cancellation. */
|
|
CANCELLATION_P (THREAD_SELF);
|
|
|
|
int *futex = (int *) sem;
|
|
int err;
|
|
|
|
do
|
|
{
|
|
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 (futex, 0);
|
|
|
|
/* Disable asynchronous cancellation. */
|
|
__pthread_disable_asynccancel (oldtype);
|
|
}
|
|
while (err == 0 || err == -EWOULDBLOCK);
|
|
|
|
__set_errno (-err);
|
|
return -1;
|
|
}
|
|
|
|
versioned_symbol (libpthread, __new_sem_wait, sem_wait, GLIBC_2_1);
|
|
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
|
|
strong_alias (__new_sem_wait, __old_sem_wait)
|
|
compat_symbol (libpthread, __old_sem_wait, sem_wait, GLIBC_2_0);
|
|
#endif
|