/***************************************************************************
 *   Copyright (C) 2005 by Jeff Ferr                                       *
 *   root@sat                                                              *
 *                                                                         *
 *   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, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#include "jsemaphore.h"
#include "jsemaphoreexception.h"
#include "jmutex.h"

#include <semaphore.h>
#include <errno.h>

namespace jthread {

bool is_wait_time_out = false;
	
Semaphore::Semaphore(uint16_t value_)
{
	if (sem_init(&_semaphore, 0, value_)) {
		if (errno == EINVAL) {
	    	throw SemaphoreException("Operation would increase the semaphore count !");
		} else {
			throw SemaphoreException("Unknown semaphore error !");
		}
	}

	_count = 0;
}

Semaphore::~Semaphore()
{
	while (sem_destroy(&_semaphore) == EBUSY) {
		Notify();
	}
}

void Semaphore::Close()
{
	sem_close(&_semaphore);
}

void Semaphore::Wait()
{
	sem_wait(&_semaphore);
}

void Semaphore::Wait(struct timespec time_)
{
	/*
	struct timespec t;

	t.tv_sec = time_.seconds;
	t.tv_nsec = time_.nano_seconds;
	*/
	
	sem_timedwait(&_semaphore, &time_);
}

void Semaphore::Notify()
{
	if (sem_post(&_semaphore)) {
		if (errno == ERANGE) {
			throw SemaphoreException("Operation would increase the semaphore count !");
		} else {
			throw SemaphoreException("Unknown semaphore error !");
		}
	}
}

bool Semaphore::TryWait()
{
	if (sem_trywait(&_semaphore)) {
		if (errno == EAGAIN) {
			return false;
		}

		throw SemaphoreException("Unknown semaphore error !");
	}

	return true;
}

int Semaphore::GetValue()
{
	int r;
    
	sem_getvalue(&_semaphore, &r);
    
	return r;
}

};