54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
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#pragma once
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// Requested feature: pthread_rwlock_t
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#ifndef __USE_XOPEN2K
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#define __USE_XOPEN2K
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#endif
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#include <pthread.h>
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#include <stdbool.h>
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/**
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* @brief A lock that can be taken exclusively but also shared. Contrarily to
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* exclusive locks, shared locks do not have wait/wake_up capabilities.
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*/
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struct shared_lock_t {
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pthread_rwlock_t rwlock;
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};
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/** Initialize the given lock.
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* @param lock Lock to initialize
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* @return Whether the operation is a success
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**/
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bool shared_lock_init(struct shared_lock_t* lock);
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/** Clean the given lock up.
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* @param lock Lock to clean up
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**/
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void shared_lock_cleanup(struct shared_lock_t* lock);
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/** Wait and acquire the given lock exclusively.
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* @param lock Lock to acquire
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* @return Whether the operation is a success
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**/
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bool shared_lock_acquire(struct shared_lock_t* lock);
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/** Release the given lock that has been taken exclusively.
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* @param lock Lock to release
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**/
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void shared_lock_release(struct shared_lock_t* lock);
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/** Wait and acquire the given lock non-exclusively.
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* @param lock Lock to acquire
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* @return Whether the operation is a success
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**/
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bool shared_lock_acquire_shared(struct shared_lock_t* lock);
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/** Release the given lock that has been taken non-exclusively.
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* @param lock Lock to release
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**/
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void shared_lock_release_shared(struct shared_lock_t* lock);
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