pthread_rwlock.h

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/*
 * Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include "priority_queue.h"
#include "thread.h"
 
#include <errno.h>
#include <stdbool.h>
 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct
{
    int readers;

    priority_queue_t queue;

    mutex_t mutex;
} pthread_rwlock_t;

typedef struct {
    bool is_writer;                 
    thread_t *thread;               
    priority_queue_node_t qnode;    
    bool continue_;                 
} __pthread_rwlock_waiter_node_t;

int pthread_rwlock_init(pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *attr);

int pthread_rwlock_destroy(pthread_rwlock_t *rwlock);

int pthread_rwlock_rdlock(pthread_rwlock_t *rwlock);

int pthread_rwlock_tryrdlock(pthread_rwlock_t *rwlock);

int pthread_rwlock_timedrdlock(pthread_rwlock_t *rwlock, const struct timespec *abstime);

int pthread_rwlock_wrlock(pthread_rwlock_t *rwlock);

int pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock);

int pthread_rwlock_timedwrlock(pthread_rwlock_t *rwlock, const struct timespec *abstime);

int pthread_rwlock_unlock(pthread_rwlock_t *rwlock);

bool __pthread_rwlock_blocked_readingly(const pthread_rwlock_t *rwlock);

bool __pthread_rwlock_blocked_writingly(const pthread_rwlock_t *rwlock);
 
#ifdef __cplusplus
}
#endif