mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 14:20:07 +00:00
58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
/* Copyright (C) 2003-2023 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/>. */
|
|
|
|
#include <errno.h>
|
|
#include <sysdep.h>
|
|
#include <futex-internal.h>
|
|
#include <pthread.h>
|
|
#include <pthreadP.h>
|
|
#include <stap-probe.h>
|
|
|
|
#include "pthread_rwlock_common.c"
|
|
|
|
/* See pthread_rwlock_common.c for an overview. */
|
|
int
|
|
___pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
|
|
{
|
|
LIBC_PROBE (rwlock_unlock, 1, rwlock);
|
|
|
|
/* We distinguish between having acquired a read vs. a write lock by looking
|
|
at the writer TID. If it's equal to our TID, we must be the writer
|
|
because nobody else can have stored this value. Also, if we are a
|
|
reader, we will read from the wrunlock store with value 0 by the most
|
|
recent writer because that writer happens-before us. */
|
|
if (atomic_load_relaxed (&rwlock->__data.__cur_writer)
|
|
== THREAD_GETMEM (THREAD_SELF, tid))
|
|
__pthread_rwlock_wrunlock (rwlock);
|
|
else
|
|
__pthread_rwlock_rdunlock (rwlock);
|
|
return 0;
|
|
}
|
|
versioned_symbol (libc, ___pthread_rwlock_unlock, pthread_rwlock_unlock,
|
|
GLIBC_2_34);
|
|
strong_alias (___pthread_rwlock_unlock, __pthread_rwlock_unlock)
|
|
libc_hidden_ver (___pthread_rwlock_unlock, __pthread_rwlock_unlock)
|
|
|
|
#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_1, GLIBC_2_34)
|
|
compat_symbol (libpthread, ___pthread_rwlock_unlock, pthread_rwlock_unlock,
|
|
GLIBC_2_1);
|
|
#endif
|
|
#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
|
|
compat_symbol (libpthread, ___pthread_rwlock_unlock, __pthread_rwlock_unlock,
|
|
GLIBC_2_2);
|
|
#endif
|