/* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */

/*

 * Copyright (c) 2006 INRIA

 * All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#include "system-semaphore.h"

#include <semaphore.h>

#include <cassert>

#include <iostream>

#include "errno.h"

#include "string.h"

namespace yans {

class SystemSemaphorePrivate {

public:

	SystemSemaphorePrivate (uint32_t init);

	void post (void);

	void post (uint32_t n);

	void wait (void);

	void wait (uint32_t n);

private:

	sem_t m_sem;

};

SystemSemaphorePrivate::SystemSemaphorePrivate (uint32_t init)

{

	int retval = sem_init (&m_sem, 0, init);

	if (retval == -1) {

		std::cout << "sem init " << this << " " << strerror (errno) << std::endl;

	}

}

void 

SystemSemaphorePrivate::post (void)

{

	int retval = sem_post (&m_sem);

	if (retval == -1) {

		std::cout << "sem post " << this << " " << strerror (errno) << std::endl;

	}

}

void 

SystemSemaphorePrivate::wait (void)

{

	int retval;

	do {

		retval = sem_wait (&m_sem);

	} while (retval == -1 && errno == EINTR);

	if (retval == -1) {

		std::cout << "sem wait " << this << " " << strerror (errno) << std::endl;

	}

}

void 

SystemSemaphorePrivate::post (uint32_t n)

{

	for (uint32_t i = 0; i < n; i++) {

		post ();

	}

}

void 

SystemSemaphorePrivate::wait (uint32_t n)

{

	for (uint32_t i = 0; i < n; i++) {

		wait ();

	}

}

SystemSemaphore::SystemSemaphore (uint32_t init)

	: m_priv (new SystemSemaphorePrivate (init))

{}

SystemSemaphore::~SystemSemaphore ()

{

	delete m_priv;

}

void 

SystemSemaphore::post (void)

{

	m_priv->post ();

}

void 

SystemSemaphore::post (uint32_t n)

{

	m_priv->post (n);

}

void 

SystemSemaphore::wait (void)

{

	m_priv->wait ();

}

void 

SystemSemaphore::wait (uint32_t n)

{

	m_priv->wait (n);

}

}; // namespace yans