Update.
[glibc.git] / nptl / pthread_rwlock_trywrlock.c
blobb754a1956549c85b69b6fa2d8c80b519be7caa6b
1 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <errno.h>
21 #include "pthreadP.h"
22 #include <lowlevellock.h>
25 int
26 __pthread_rwlock_trywrlock (rwlock)
27 pthread_rwlock_t *rwlock;
29 int result = EBUSY;
31 lll_mutex_lock (rwlock->__data.__lock);
33 if (rwlock->__data.__writer == 0 && rwlock->__data.__nr_readers == 0)
35 rwlock->__data.__writer = THREAD_GETMEM (THREAD_SELF, tid);
36 result = 0;
39 lll_mutex_unlock (rwlock->__data.__lock);
41 return result;
43 strong_alias (__pthread_rwlock_trywrlock, pthread_rwlock_trywrlock)