44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/*
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* Copyright (c) 2013, 2021 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* pthread/pthread_cond_broadcast.c
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* Broadcasts a condition.
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*/
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#include <sys/futex.h>
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#include <stddef.h>
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#include <pthread.h>
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int pthread_cond_broadcast(pthread_cond_t* cond)
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{
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pthread_mutex_lock(&cond->lock);
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while ( cond->first )
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{
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struct pthread_cond_elem* elem = cond->first;
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if ( elem->next )
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elem->next->prev = elem->prev;
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else
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cond->last = elem->prev;
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cond->first = elem->next;
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elem->next = NULL;
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elem->prev = NULL;
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__atomic_store_n(&elem->woken, 1, __ATOMIC_SEQ_CST);
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futex(&elem->woken, FUTEX_WAKE, 1, NULL);
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}
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pthread_mutex_unlock(&cond->lock);
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return 0;
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}
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