bee2df0bb9
reader preference. * sysdeps/pthread/pthread_rwlock_timedwrlock.c (pthread_rwlock_timedwrlock): Likewise. * sysdeps/pthread/pthread_rwlock_wrlock.c (__pthread_rwlock_wrlock): Likewise.
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* Copyright (C) 2002, 2003, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <errno.h>
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#include "pthreadP.h"
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#include <lowlevellock.h>
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int
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__pthread_rwlock_trywrlock (rwlock)
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pthread_rwlock_t *rwlock;
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{
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int result = EBUSY;
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lll_mutex_lock (rwlock->__data.__lock);
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if (rwlock->__data.__writer == 0 && rwlock->__data.__nr_readers == 0
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/* Respect the preference. */
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&& (rwlock->__data.__flags != 0
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|| rwlock->__data.__nr_readers_queued == 0))
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{
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rwlock->__data.__writer = THREAD_GETMEM (THREAD_SELF, tid);
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result = 0;
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}
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lll_mutex_unlock (rwlock->__data.__lock);
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return result;
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}
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strong_alias (__pthread_rwlock_trywrlock, pthread_rwlock_trywrlock)
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