37 lines
1.4 KiB
C
37 lines
1.4 KiB
C
/*
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* Copyright (c) 2013, 2024 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_rwlock_clockwrlock.c
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* Acquires write access to a read-write lock or waits for a timeout.
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*/
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#include <pthread.h>
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int pthread_rwlock_clocklock(pthread_rwlock_t* rwlock, clockid_t clock,
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const struct timespec* abstime)
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{
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pthread_mutex_lock(&rwlock->request_mutex);
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rwlock->pending_writers++;
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int ret = 0;
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while ( !ret && (rwlock->num_readers || rwlock->num_writers) )
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ret = pthread_cond_clockwait(&rwlock->writer_condition,
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&rwlock->request_mutex, clock, abstime);
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rwlock->pending_writers--;
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if ( !ret )
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rwlock->num_writers = 1;
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pthread_mutex_unlock(&rwlock->request_mutex);
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return ret;
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}
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