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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.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** 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.
**
** 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:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsystemsemaphore.h"
#include "qsystemsemaphore_p.h"
#include "qcoreapplication.h"
#include <qdebug.h>
#include "qcore_symbian_p.h"
#include <e32cmn.h>
#ifndef QT_NO_SYSTEMSEMAPHORE
//#define QSYSTEMSEMAPHORE_DEBUG
QT_BEGIN_NAMESPACE
QSystemSemaphorePrivate::QSystemSemaphorePrivate() :
error(QSystemSemaphore::NoError)
{
}
void QSystemSemaphorePrivate::setErrorString(const QString &function, int err)
{
if (err == KErrNone)
return;
switch(err){
case KErrAlreadyExists:
errorString = QCoreApplication::tr("%1: already exists", "QSystemSemaphore").arg(function);
error = QSystemSemaphore::AlreadyExists;
break;
case KErrNotFound:
errorString = QCoreApplication::tr("%1: does not exist", "QSystemSemaphore").arg(function);
error = QSystemSemaphore::NotFound;
break;
case KErrNoMemory:
case KErrInUse:
errorString = QCoreApplication::tr("%1: out of resources", "QSystemSemaphore").arg(function);
error = QSystemSemaphore::OutOfResources;
break;
case KErrPermissionDenied:
errorString = QCoreApplication::tr("%1: permission denied", "QSystemSemaphore").arg(function);
error = QSystemSemaphore::PermissionDenied;
break;
default:
errorString = QCoreApplication::tr("%1: unknown error %2", "QSystemSemaphore").arg(function).arg(err);
error = QSystemSemaphore::UnknownError;
#ifdef QSYSTEMSEMAPHORE_DEBUG
qDebug() << errorString << "key" << key;
#endif
break;
}
}
int QSystemSemaphorePrivate::handle(QSystemSemaphore::AccessMode)
{
if (semaphore.Handle())
return semaphore.Handle();
// don't allow making handles on empty keys
if (key.isEmpty())
return 0;
TPtrC name(qt_QString2TPtrC(fileName));
int err = KErrAlreadyExists;
int tryCount = 10;
// Sort out race conditions by retrying several times until existing handle is acquired.
// Sometimes opening can fail inexplicably with KErrPermissionDenied many times in a row.
while (err != KErrNoMemory && err != KErrNone && tryCount-- >= 0) {
err = semaphore.CreateGlobal(name, initialValue, EOwnerProcess);
if (err != KErrNoMemory && err != KErrNone)
err = semaphore.OpenGlobal(name, EOwnerProcess);
}
if (err) {
setErrorString(QLatin1String("QSystemSemaphore::handle"), err);
return 0;
}
return semaphore.Handle();
}
void QSystemSemaphorePrivate::cleanHandle()
{
semaphore.Close();
}
bool QSystemSemaphorePrivate::modifySemaphore(int count)
{
if (0 == handle())
return false;
if (count > 0)
semaphore.Signal(count);
else
semaphore.Wait();
return true;
}
QT_END_NAMESPACE
#endif // QT_NO_SYSTEMSEMAPHORE
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