41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/*
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* Copyright (c) 2013 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_unlock.c
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* Releases hold of a read-write lock.
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*/
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#include <pthread.h>
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int pthread_rwlock_unlock(pthread_rwlock_t* rwlock)
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{
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pthread_mutex_lock(&rwlock->request_mutex);
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if ( rwlock->num_writers )
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{
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rwlock->num_writers = 0;
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if ( rwlock->pending_writers )
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pthread_cond_signal(&rwlock->writer_condition);
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else
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pthread_cond_broadcast(&rwlock->reader_condition);
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}
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else
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{
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if ( --rwlock->num_readers == 0 && rwlock->pending_writers )
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pthread_cond_signal(&rwlock->writer_condition);
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}
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pthread_mutex_unlock(&rwlock->request_mutex);
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return 0;
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}
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