PosixMutex.cpp

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/*
 * PosixMutex.cpp
 *
 * Copyright (C) 2012 Evidence Srl - www.evidence.eu.com
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include "PosixMutex.hpp"
#include "Assert.hpp"
#include <errno.h>
#include <string.h>
#include <stdexcept>

namespace onposix {

/**
 * \brief Constructor. Initialize the mutex.
 *
 * @exception runtime_error if the mutex initialization fails.
 */
PosixMutex::PosixMutex()
{
        if (pthread_mutex_init(&mutex_, NULL) != 0)
                throw std::runtime_error(std::string("Error: ") + strerror(errno));
}

/**
 * \brief Destructor. Destroys the mutex.
 */
PosixMutex::~PosixMutex()
{
        VERIFY_ASSERTION(!pthread_mutex_destroy(&mutex_));
}

/**
 * \brief Tries to acquire the lock.
 *
 * If the mutex is busy the calling thread
 * continues its executions
 * @return True if the lock is acquired, false otherwise.
 */
bool PosixMutex::tryLock()
{
        if (pthread_mutex_trylock(&mutex_) == EBUSY)
                return false;
        else
                return true;
}

} /* onposix */