45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/*
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* Copyright (c) 2013, 2014 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_wait.c
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* Waits on a condition.
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*/
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#include <pthread.h>
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#include <sched.h>
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#include <time.h>
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#include <timespec.h>
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#include <unistd.h>
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int pthread_cond_wait(pthread_cond_t* restrict cond,
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pthread_mutex_t* restrict mutex)
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{
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struct pthread_cond_elem elem;
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elem.next = NULL;
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elem.woken = 0;
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if ( cond->last )
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cond->last->next = &elem;
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if ( !cond->last )
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cond->first = &elem;
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cond->last = &elem;
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while ( !elem.woken )
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{
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pthread_mutex_unlock(mutex);
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sched_yield();
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pthread_mutex_lock(mutex);
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}
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return 0;
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}
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