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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2025 J. Alonso Cardenas <acm@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef PORTABLE_RWLOCK_H
#define PORTABLE_RWLOCK_H
#include <pthread.h>
typedef struct {
pthread_mutex_t lock;
pthread_cond_t readers_ok;
pthread_cond_t writers_ok;
int active_readers;
int waiting_writers;
int writer_active;
} portable_rwlock_t;
int portable_rwlock_init(portable_rwlock_t *rw);
int portable_rwlock_rdlock(portable_rwlock_t *rw);
int portable_rwlock_rdunlock(portable_rwlock_t *rw);
int portable_rwlock_wrlock(portable_rwlock_t *rw);
int portable_rwlock_wrunlock(portable_rwlock_t *rw);
int portable_rwlock_destroy(portable_rwlock_t *rw);
#endif // PORTABLE_RWLOCK_H
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