/*-
 * This file is a part of the MDCacheD server
 * (c) 2007.-2010. Ivan Voras <ivoras@gmail.com>
 * Released under the 2-clause BSDL.
 * $Id: RWLock.h 347 2011-09-20 20:58:41Z ivoras $
 */

#ifndef _RWLock_H_
#define _RWLock_H_

#include <pthread.h>
#include <exception>


class RWLockException : public std::exception {
private:
	char *msg;
public:
	RWLockException(char *msg) : exception() {
		this->msg = msg;
	}
};


class RWLock {
public:
	RWLock() throw (RWLockException) {
		if (pthread_rwlock_init(&rwl, NULL) != 0)
			throw new RWLockException((char*)"pthread_rwlock_init failed at " __FILE__);
	}
	~RWLock() {
		pthread_rwlock_destroy(&rwl);
	}
	void RdLock() {
		pthread_rwlock_rdlock(&rwl);
	}
	void WrLock() {
		pthread_rwlock_wrlock(&rwl);
	}
	bool TryRdLock() {
		return pthread_rwlock_tryrdlock(&rwl) == 0;
	}
	bool TryWrLock() {
		return pthread_rwlock_trywrlock(&rwl) == 0;
	}
	void Unlock() {
		pthread_rwlock_unlock(&rwl);
	}
private:
	pthread_rwlock_t rwl;
};

#endif