/* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of NVIDIA CORPORATION nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "ConditionVariable.h"
#include "Mutex.h"
#include "Error.h"

namespace ArgusSamples
{

ConditionVariable::ConditionVariable()
    : m_initialized(false)
{
}

ConditionVariable::~ConditionVariable()
{
    shutdown();
}

bool ConditionVariable::initialize()
{
    if (!m_initialized)
    {
        if (pthread_cond_init(&m_cond, NULL) != 0)
            ORIGINATE_ERROR("Failed to initialize condition variable");
        m_initialized = true;
    }

    return true;
}

bool ConditionVariable::shutdown()
{
    if (m_initialized)
    {
        if (pthread_cond_destroy(&m_cond) != 0)
            ORIGINATE_ERROR("Failed to destroy condition variable");
        m_initialized = false;
    }

    return true;
}

bool ConditionVariable::broadcast() const
{
    if (!m_initialized)
        ORIGINATE_ERROR("Not initialized");

    if (pthread_cond_broadcast(&m_cond) != 0)
        ORIGINATE_ERROR("pthread_cond_broadcast failed");
    return true;
}

bool ConditionVariable::signal() const
{
    if (!m_initialized)
        ORIGINATE_ERROR("Not initialized");

    if (pthread_cond_signal(&m_cond) != 0)
        ORIGINATE_ERROR("pthread_cond_signal failed");
    return true;
}

bool ConditionVariable::wait(const Mutex& mutex) const
{
    if (!m_initialized)
        ORIGINATE_ERROR("Not initialized");

    if (pthread_cond_wait(&m_cond, mutex.getPThreadMutex()) != 0)
        ORIGINATE_ERROR("pthread_cond_signal failed");
    return true;
}

}; // namespace ArgusSamples
