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2003-05-28 Ulrich Drepper <drepper@redhat.com> * sysdeps/pthread/pthread_cond_broadcast.c (__pthread_cond_broadcast): Fix typo: MAX_INT -> INT_MAX.
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/* Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
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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 <endian.h>
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#include <errno.h>
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#include <sysdep.h>
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#include <lowlevellock.h>
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#include <pthread.h>
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#include <pthreadP.h>
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#include <shlib-compat.h>
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#include <kernel-features.h>
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int
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__pthread_cond_broadcast (cond)
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pthread_cond_t *cond;
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{
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/* Make sure we are alone. */
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lll_mutex_lock (cond->__data.__lock);
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/* Are there any waiters to be woken? */
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if (cond->__data.__total_seq > cond->__data.__wakeup_seq)
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{
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/* Yes. Mark them all as woken. */
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cond->__data.__wakeup_seq = cond->__data.__total_seq;
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/* We are done. */
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lll_mutex_unlock (cond->__data.__lock);
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/* The futex syscall operates on a 32-bit word. That is fine,
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we just use the low 32 bits of the sequence counter. */
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#if BYTE_ORDER == LITTLE_ENDIAN
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int *futex = ((int *) (&cond->__data.__wakeup_seq));
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#elif BYTE_ORDER == BIG_ENDIAN
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int *futex = ((int *) (&cond->__data.__wakeup_seq)) + 1;
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#else
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# error "No valid byte order"
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#endif
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/* Wake everybody. */
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pthread_mutex_t *mut = (pthread_mutex_t *) cond->__data.__mutex;
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if (__builtin_expect (lll_futex_requeue (futex, 1, INT_MAX,
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&mut->__data.__lock) == -EINVAL,
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0))
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{
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/* The requeue functionality is not available. */
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#ifndef __ASSUME_FUTEX_REQUEUE
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lll_futex_wake (futex, INT_MAX);
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#endif
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}
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/* That's all. */
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return 0;
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}
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/* We are done. */
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lll_mutex_unlock (cond->__data.__lock);
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return 0;
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}
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versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,
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GLIBC_2_3_2);
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