67 lines
2.5 KiB
C
67 lines
2.5 KiB
C
/*
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Copyright (c) 2015 Anton Titov.
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Copyright (c) 2015 pCloud Ltd. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met: Redistributions of source code must retain the above
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copyright notice, this list of conditions and the following
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disclaimer. Redistributions in binary form must reproduce the
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above copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution. Neither the name of pCloud Ltd nor the
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names of its contributors may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL pCloud
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Ltd BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGE.
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*/
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#ifndef _PSYNC_LOCKS_H
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#define _PSYNC_LOCKS_H
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#include <pthread.h>
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typedef struct {
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unsigned rcount;
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unsigned rwait;
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unsigned wcount;
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unsigned wwait;
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unsigned opts;
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pthread_key_t cntkey;
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pthread_mutex_t mutex;
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pthread_cond_t rcond;
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pthread_cond_t wcond;
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} psync_rwlock_t;
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void plocks_init(psync_rwlock_t *rw);
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void plocks_destroy(psync_rwlock_t *rw);
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void plocks_rdlock(psync_rwlock_t *rw);
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int plocks_tryrdlock(psync_rwlock_t *rw);
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int plocks_timedrdlock(psync_rwlock_t *rw, const struct timespec *abstime);
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void plocks_rdlock_starvewr(psync_rwlock_t *rw);
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void plocks_wrlock(psync_rwlock_t *rw);
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int plocks_trywrlock(psync_rwlock_t *rw);
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int plocks_timedwrlock(psync_rwlock_t *rw, const struct timespec *abstime);
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void plocks_rslock(psync_rwlock_t *rw);
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int plocks_towrlock(psync_rwlock_t *rw);
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void plocks_unlock(psync_rwlock_t *rw);
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unsigned plocks_num_waiters(psync_rwlock_t *rw);
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int plocks_holding_rdlock(psync_rwlock_t *rw);
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int plocks_holding_wrlock(psync_rwlock_t *rw);
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int plocks_holding_lock(psync_rwlock_t *rw);
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#endif
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