/*
 * Copyright (c) 2013, 2024 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * pthread/pthread_rwlock_clockwrlock.c
 * Acquires write access to a read-write lock or waits for a timeout.
 */

#include <pthread.h>

int pthread_rwlock_clockwrlock(pthread_rwlock_t* rwlock, clockid_t clock,
                               const struct timespec* abstime)
{
	pthread_mutex_lock(&rwlock->request_mutex);
	rwlock->pending_writers++;
	int ret = 0;
	while ( !ret && (rwlock->num_readers || rwlock->num_writers) )
		ret = pthread_cond_clockwait(&rwlock->writer_condition,
		                             &rwlock->request_mutex, clock, abstime);
	rwlock->pending_writers--;
	if ( !ret )
		rwlock->num_writers = 1;
	pthread_mutex_unlock(&rwlock->request_mutex);
	return ret;
}
