Function pthread_rwlock_init

components/libc/posix/pthreads/pthread_rwlock.c:78–94

* @brief Initializes a read-write lock. * * This function initializes the read-write lock object pointed to by `rwlock` with the * attributes specified by `attr`. If `attr` is `NULL`, the default attributes are used. * A read-write lock allows multiple threads to read or a single thread to write, but not both simultaneously. * * @param rwlock A pointer to the read-write lock object to be ini

 * @see pthread_rwlock_destroy, pthread_rwlock_rdlock, pthread_rwlock_wrlock, pthread_rwlock_unlock
 */
int pthread_rwlock_init(pthread_rwlock_t           *rwlock,
                        const pthread_rwlockattr_t *attr)
{
    if (!rwlock)
        return EINVAL;

    rwlock->attr = PTHREAD_PROCESS_PRIVATE;
    pthread_mutex_init(&(rwlock->rw_mutex), NULL);
    pthread_cond_init(&(rwlock->rw_condreaders), NULL);
    pthread_cond_init(&(rwlock->rw_condwriters), NULL);

    rwlock->rw_nwaitwriters = 0;
    rwlock->rw_nwaitreaders = 0;
    rwlock->rw_refcount = 0;

    return 0;
}
RTM_EXPORT(pthread_rwlock_init);

/**