57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2014.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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pthread/pthread_cond_timedwait.c
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Waits on a condition or until a timeout happens.
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*******************************************************************************/
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#include <errno.h>
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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_timedwait(pthread_cond_t* restrict cond,
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pthread_mutex_t* restrict mutex,
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const struct timespec* restrict abstime)
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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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struct timespec now;
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if ( clock_gettime(cond->clock, &now) < 0 )
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return errno;
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if ( timespec_le(*abstime, now) )
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return errno = ETIMEDOUT;
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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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