locking.h

/*
 * Copyright 2008-2013 Various Authors
 * Copyright 2004 Timo Hirvonen
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#ifndef CMUS_LOCKING_H
#define CMUS_LOCKING_H

#include <pthread.h>
#include <stdatomic.h>

struct fifo_mutex {
	struct fifo_waiter * _Atomic tail;
	struct fifo_waiter *head;
	pthread_mutex_t mutex;
};

extern pthread_t main_thread;

#define CMUS_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
#define CMUS_COND_INITIALIZER PTHREAD_COND_INITIALIZER
#define CMUS_RWLOCK_INITIALIZER PTHREAD_RWLOCK_INITIALIZER

#define FIFO_MUTEX_INITIALIZER { \
		.mutex = PTHREAD_MUTEX_INITIALIZER, \
		.tail = ATOMIC_VAR_INIT(NULL), \
	}

void cmus_mutex_lock(pthread_mutex_t *mutex);
void cmus_mutex_unlock(pthread_mutex_t *mutex);
void cmus_rwlock_rdlock(pthread_rwlock_t *lock);
void cmus_rwlock_wrlock(pthread_rwlock_t *lock);
void cmus_rwlock_unlock(pthread_rwlock_t *lock);

void fifo_mutex_lock(struct fifo_mutex *fifo);
void fifo_mutex_unlock(struct fifo_mutex *fifo);
void fifo_mutex_yield(struct fifo_mutex *fifo);

#endif