94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/* Copyright (C) 2003-2016 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, see
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<http://www.gnu.org/licenses/>. */
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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 <stap-probe.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 (pthread_cond_t *cond)
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{
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LIBC_PROBE (cond_broadcast, 1, cond);
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int pshared = (cond->__data.__mutex == (void *) ~0l)
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? LLL_SHARED : LLL_PRIVATE;
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/* Make sure we are alone. */
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lll_lock (cond->__data.__lock, pshared);
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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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cond->__data.__woken_seq = cond->__data.__total_seq;
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cond->__data.__futex = (unsigned int) cond->__data.__total_seq * 2;
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int futex_val = cond->__data.__futex;
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/* Signal that a broadcast happened. */
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++cond->__data.__broadcast_seq;
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/* We are done. */
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lll_unlock (cond->__data.__lock, pshared);
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/* Wake everybody. */
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pthread_mutex_t *mut = (pthread_mutex_t *) cond->__data.__mutex;
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/* Do not use requeue for pshared condvars. */
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if (mut == (void *) ~0l
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|| PTHREAD_MUTEX_PSHARED (mut) & PTHREAD_MUTEX_PSHARED_BIT)
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goto wake_all;
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#if (defined lll_futex_cmp_requeue_pi \
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&& defined __ASSUME_REQUEUE_PI)
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if (USE_REQUEUE_PI (mut))
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{
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if (lll_futex_cmp_requeue_pi (&cond->__data.__futex, 1, INT_MAX,
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&mut->__data.__lock, futex_val,
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LLL_PRIVATE) == 0)
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return 0;
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}
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else
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#endif
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/* lll_futex_requeue returns 0 for success and non-zero
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for errors. */
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if (!__builtin_expect (lll_futex_requeue (&cond->__data.__futex, 1,
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INT_MAX, &mut->__data.__lock,
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futex_val, LLL_PRIVATE), 0))
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return 0;
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wake_all:
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lll_futex_wake (&cond->__data.__futex, INT_MAX, pshared);
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return 0;
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}
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/* We are done. */
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lll_unlock (cond->__data.__lock, pshared);
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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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