mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/* sem_post -- post to a POSIX semaphore. Powerpc version.
|
|
Copyright (C) 2003-2014 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_post (sem_t *sem)
|
|
{
|
|
struct new_sem *isem = (struct new_sem *) sem;
|
|
|
|
__asm __volatile (__lll_rel_instr ::: "memory");
|
|
atomic_increment (&isem->value);
|
|
__asm __volatile (__lll_acq_instr ::: "memory");
|
|
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)
|
|
{
|
|
int *futex = (int *) sem;
|
|
|
|
__asm __volatile (__lll_rel_instr ::: "memory");
|
|
(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);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
compat_symbol (libpthread, __old_sem_post, sem_post, GLIBC_2_0);
|
|
#endif
|