/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the QtCore module of the Qt Toolkit.
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** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
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**
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** Alternatively, this file may be used in accordance with the terms and
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** $QT_END_LICENSE$
**
****************************************************************************/

#include "qplatformdefs.h"
#include "qmutex.h"
#include "qstring.h"

#ifndef QT_NO_THREAD
#include "qatomic.h"
#include "qmutex_p.h"
#include <errno.h>

#if defined(Q_OS_VXWORKS) && defined(wakeup)
#undef wakeup
#endif

QT_BEGIN_NAMESPACE

static void report_error(int code, const char *where, const char *what)
{
    if (code != 0)
        qWarning("%s: %s failure: %s", where, what, qPrintable(qt_error_string(code)));
}

QMutexPrivate::QMutexPrivate()
    : wakeup(false)
{
    report_error(pthread_mutex_init(&mutex, NULL), "QMutex", "mutex init");
    report_error(pthread_cond_init(&cond, NULL), "QMutex", "cv init");
}

QMutexPrivate::~QMutexPrivate()
{
    report_error(pthread_cond_destroy(&cond), "QMutex", "cv destroy");
    report_error(pthread_mutex_destroy(&mutex), "QMutex", "mutex destroy");
}

bool QMutexPrivate::wait(int timeout)
{
    report_error(pthread_mutex_lock(&mutex), "QMutex::lock", "mutex lock");
    int errorCode = 0;
    while (!wakeup) {
        if (timeout < 0) {
            errorCode = pthread_cond_wait(&cond, &mutex);
        } else {
            struct timeval tv;
            gettimeofday(&tv, 0);
            timespec ti;
            ti.tv_nsec = (tv.tv_usec + (timeout % 1000) * 1000) * 1000;
            ti.tv_sec = tv.tv_sec + (timeout / 1000) + (ti.tv_nsec / 1000000000);
            ti.tv_nsec %= 1000000000;
            errorCode = pthread_cond_timedwait(&cond, &mutex, &ti);
        }
        if (errorCode) {
            if (errorCode == ETIMEDOUT) {
                if (wakeup)
                    errorCode = 0;
                break;
            }
            report_error(errorCode, "QMutex::lock()", "cv wait");
        }
    }
    bool ret = wakeup;
    wakeup = false;
    report_error(pthread_mutex_unlock(&mutex), "QMutex::lock", "mutex unlock");
    return ret;
}

void QMutexPrivate::wakeUp()
{
    report_error(pthread_mutex_lock(&mutex), "QMutex::unlock", "mutex lock");
    wakeup = true;
    report_error(pthread_cond_signal(&cond), "QMutex::unlock", "cv signal");
    report_error(pthread_mutex_unlock(&mutex), "QMutex::unlock", "mutex unlock");
}


QT_END_NAMESPACE

#endif // QT_NO_THREAD