glibc/nptl/sysdeps/pthread/pthread_cond_broadcast.c
Ulrich Drepper 75fcceded2 Update.
2004-06-03  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/i386/i486/bits/atomic.h: Optimize a bit.
2004-06-03 16:04:11 +00:00

81 lines
2.5 KiB
C

/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Martin Schwidefsky <schwidefsky@de.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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <endian.h>
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <pthread.h>
#include <pthreadP.h>
#include <shlib-compat.h>
#include <kernel-features.h>
int
__pthread_cond_broadcast (cond)
pthread_cond_t *cond;
{
/* Make sure we are alone. */
lll_mutex_lock (cond->__data.__lock);
/* Are there any waiters to be woken? */
if (cond->__data.__total_seq > cond->__data.__wakeup_seq)
{
/* Yes. Mark them all as woken. */
cond->__data.__wakeup_seq = cond->__data.__total_seq;
cond->__data.__woken_seq = cond->__data.__total_seq;
cond->__data.__futex = (unsigned int) cond->__data.__total_seq * 2;
int futex_val = cond->__data.__futex;
/* Signal that a broadcast happened. */
++cond->__data.__broadcast_seq;
/* We are done. */
lll_mutex_unlock (cond->__data.__lock);
/* Do not use requeue for pshared condvars. */
if (cond->__data.__mutex == (void *) ~0l)
goto wake_all;
/* Wake everybody. */
pthread_mutex_t *mut = (pthread_mutex_t *) cond->__data.__mutex;
/* lll_futex_requeue returns 0 for success and non-zero
for errors. */
if (__builtin_expect (lll_futex_requeue (&cond->__data.__futex, 1,
INT_MAX, &mut->__data.__lock,
futex_val), 0))
{
/* The requeue functionality is not available. */
wake_all:
lll_futex_wake (&cond->__data.__futex, INT_MAX);
}
/* That's all. */
return 0;
}
/* We are done. */
lll_mutex_unlock (cond->__data.__lock);
return 0;
}
versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast,
GLIBC_2_3_2);