diff options
Diffstat (limited to 'src/corelib/kernel/qsystemsemaphore_win.cpp')
-rw-r--r-- | src/corelib/kernel/qsystemsemaphore_win.cpp | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/corelib/kernel/qsystemsemaphore_win.cpp b/src/corelib/kernel/qsystemsemaphore_win.cpp new file mode 100644 index 0000000..5912344 --- /dev/null +++ b/src/corelib/kernel/qsystemsemaphore_win.cpp @@ -0,0 +1,140 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, 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. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qsystemsemaphore.h" +#include "qsystemsemaphore_p.h" +#include "qcoreapplication.h" +#include <qdebug.h> + +QT_BEGIN_NAMESPACE + +#ifndef QT_NO_SYSTEMSEMAPHORE + +QSystemSemaphorePrivate::QSystemSemaphorePrivate() : + semaphore(0), error(QSystemSemaphore::NoError) +{ +} + +void QSystemSemaphorePrivate::setErrorString(const QString &function) +{ + BOOL windowsError = GetLastError(); + if (windowsError == 0) + return; + + switch (windowsError) { + case ERROR_NO_SYSTEM_RESOURCES: + case ERROR_NOT_ENOUGH_MEMORY: + error = QSystemSemaphore::OutOfResources; + errorString = QCoreApplication::translate("QSystemSemaphore", "%1: out of resources").arg(function); + break; + case ERROR_ACCESS_DENIED: + error = QSystemSemaphore::PermissionDenied; + errorString = QCoreApplication::translate("QSystemSemaphore", "%1: permission denied").arg(function); + break; + default: + errorString = QCoreApplication::translate("QSystemSemaphore", "%1: unknown error %2").arg(function).arg(windowsError); + error = QSystemSemaphore::UnknownError; +#if defined QSYSTEMSEMAPHORE_DEBUG + qDebug() << errorString << "key" << key; +#endif + } +} + +HANDLE QSystemSemaphorePrivate::handle(QSystemSemaphore::AccessMode) +{ + // don't allow making handles on empty keys + if (key.isEmpty()) + return 0; + + // Create it if it doesn't already exists. + if (semaphore == 0) { + QString safeName = makeKeyFileName(); + QT_WA({ + semaphore = CreateSemaphoreW(0, initialValue, MAXLONG, (TCHAR*)safeName.utf16()); + }, { + semaphore = CreateSemaphoreA(0, initialValue, MAXLONG, safeName.toLocal8Bit().constData()); + }); + if (semaphore == NULL) + setErrorString(QLatin1String("QSystemSemaphore::handle")); + } + + return semaphore; +} + +void QSystemSemaphorePrivate::cleanHandle() +{ + if (semaphore && !CloseHandle(semaphore)) { +#if defined QSYSTEMSEMAPHORE_DEBUG + qDebug() << QLatin1String("QSystemSemaphorePrivate::CloseHandle: sem failed"); +#endif + } + semaphore = 0; +} + +bool QSystemSemaphorePrivate::modifySemaphore(int count) +{ + if (0 == handle()) + return false; + + if (count > 0) { + if (0 == ReleaseSemaphore(semaphore, count, 0)) { + setErrorString(QLatin1String("QSystemSemaphore::modifySemaphore")); +#if defined QSYSTEMSEMAPHORE_DEBUG + qDebug() << QLatin1String("QSystemSemaphore::modifySemaphore ReleaseSemaphore failed"); +#endif + return false; + } + } else { + if (WAIT_OBJECT_0 != WaitForSingleObject(semaphore, INFINITE)) { + setErrorString(QLatin1String("QSystemSemaphore::modifySemaphore")); +#if defined QSYSTEMSEMAPHORE_DEBUG + qDebug() << QLatin1String("QSystemSemaphore::modifySemaphore WaitForSingleObject failed"); +#endif + return false; + } + } + + return true; +} + +#endif //QT_NO_SYSTEMSEMAPHORE + +QT_END_NAMESPACE |