/*************************************************************************/
/*  rw_lock_posix.cpp                                                    */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
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#if defined(UNIX_ENABLED) || defined(PTHREAD_ENABLED)

#include "rw_lock_posix.h"

#include "core/error/error_macros.h"
#include "core/os/memory.h"
#include <stdio.h>

void RWLockPosix::read_lock() {
	int err = pthread_rwlock_rdlock(&rwlock);
	if (err != 0) {
		perror("Acquiring lock failed");
	}
	ERR_FAIL_COND(err != 0);
}

void RWLockPosix::read_unlock() {
	pthread_rwlock_unlock(&rwlock);
}

Error RWLockPosix::read_try_lock() {
	if (pthread_rwlock_tryrdlock(&rwlock) != 0) {
		return ERR_BUSY;
	} else {
		return OK;
	}
}

void RWLockPosix::write_lock() {
	int err = pthread_rwlock_wrlock(&rwlock);
	ERR_FAIL_COND(err != 0);
}

void RWLockPosix::write_unlock() {
	pthread_rwlock_unlock(&rwlock);
}

Error RWLockPosix::write_try_lock() {
	if (pthread_rwlock_trywrlock(&rwlock) != 0) {
		return ERR_BUSY;
	} else {
		return OK;
	}
}

RWLock *RWLockPosix::create_func_posix() {
	return memnew(RWLockPosix);
}

void RWLockPosix::make_default() {
	create_func = create_func_posix;
}

RWLockPosix::RWLockPosix() {
	//rwlock=PTHREAD_RWLOCK_INITIALIZER; fails on OSX
	pthread_rwlock_init(&rwlock, nullptr);
}

RWLockPosix::~RWLockPosix() {
	pthread_rwlock_destroy(&rwlock);
}

#endif