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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, 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.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qplatformdefs.h"
#include "qmutex.h"
#ifndef QT_NO_THREAD
#include "qatomic.h"
#include "qelapsedtimer.h"
#include "qthread.h"
#include "qmutex_p.h"
QT_BEGIN_NAMESPACE
QMutexPrivate::QMutexPrivate(QMutex::RecursionMode mode)
: QMutexData(mode), maximumSpinTime(MaximumSpinTimeThreshold), averageWaitTime(0), owner(0), count(0)
{
int r = lock.CreateLocal(0);
if (r != KErrNone)
qWarning("QMutex: failed to create lock, error %d", r);
qt_symbian_throwIfError(r);
}
QMutexPrivate::~QMutexPrivate()
{
lock.Close();
}
bool QMutexPrivate::wait(int timeout)
{
if (contenders.fetchAndAddAcquire(1) == 0) {
// lock acquired without waiting
return true;
}
int r = KErrTimedOut;
if (timeout < 0) {
lock.Wait();
r = KErrNone;
} else {
// Symbian lock waits are specified in microseconds.
// The wait is therefore chunked.
// KErrNone indicates success, KErrGeneral and KErrArgument are real fails, anything else is a timeout
do {
int waitTime = qMin(KMaxTInt / 1000, timeout);
timeout -= waitTime;
// Symbian undocumented feature - 0us means no timeout! Use a minimum of 1
r = lock.Wait(qMax(1, waitTime * 1000));
} while (r != KErrNone && r != KErrGeneral && r != KErrArgument && timeout > 0);
}
bool returnValue = (r == KErrNone);
contenders.deref();
return returnValue;
}
void QMutexPrivate::wakeUp()
{
lock.Signal();
}
QT_END_NAMESPACE
#endif // QT_NO_THREAD
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