/**************************************************************************** | |
** | |
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
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** 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 | |
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** file. Please review the following information to ensure the GNU Lesser | |
** General Public License version 2.1 requirements will be met: | |
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** | |
** 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. | |
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** $QT_END_LICENSE$ | |
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****************************************************************************/ | |
#include "qsystemsemaphore.h" | |
#include "qsystemsemaphore_p.h" | |
#include "qcoreapplication.h" | |
#include <qdebug.h> | |
#include "qcore_symbian_p.h" | |
#include <e32cmn.h> | |
QT_BEGIN_NAMESPACE | |
#ifndef QT_NO_SYSTEMSEMAPHORE | |
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; | |
} | |
#if defined QSYSTEMSEMAPHORE_DEBUG | |
qDebug() << errorString << "key" << key; | |
#endif | |
} | |
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; | |
} | |
#endif //QT_NO_SYSTEMSEMAPHORE | |
QT_END_NAMESPACE |