143 lines
4.9 KiB
C++
143 lines
4.9 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qsystemsemaphore.h"
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#include "qsystemsemaphore_p.h"
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#include "qcoreapplication.h"
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#include <qdebug.h>
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#include <qt_windows.h>
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QT_BEGIN_NAMESPACE
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#ifndef QT_NO_SYSTEMSEMAPHORE
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QSystemSemaphorePrivate::QSystemSemaphorePrivate() :
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semaphore(0), error(QSystemSemaphore::NoError)
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{
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}
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void QSystemSemaphorePrivate::setErrorString(const QString &function)
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{
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BOOL windowsError = GetLastError();
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if (windowsError == 0)
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return;
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switch (windowsError) {
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case ERROR_NO_SYSTEM_RESOURCES:
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case ERROR_NOT_ENOUGH_MEMORY:
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error = QSystemSemaphore::OutOfResources;
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errorString = QCoreApplication::translate("QSystemSemaphore", "%1: out of resources").arg(function);
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break;
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case ERROR_ACCESS_DENIED:
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error = QSystemSemaphore::PermissionDenied;
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errorString = QCoreApplication::translate("QSystemSemaphore", "%1: permission denied").arg(function);
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break;
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default:
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errorString = QCoreApplication::translate("QSystemSemaphore", "%1: unknown error %2").arg(function).arg(windowsError);
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error = QSystemSemaphore::UnknownError;
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#if defined QSYSTEMSEMAPHORE_DEBUG
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qDebug() << errorString << "key" << key;
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#endif
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}
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}
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HANDLE QSystemSemaphorePrivate::handle(QSystemSemaphore::AccessMode)
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{
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// don't allow making handles on empty keys
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if (key.isEmpty())
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return 0;
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// Create it if it doesn't already exists.
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if (semaphore == 0) {
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#if defined(Q_OS_WINRT)
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semaphore = CreateSemaphoreEx(0, initialValue, MAXLONG,
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reinterpret_cast<const wchar_t*>(fileName.utf16()),
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0, SEMAPHORE_ALL_ACCESS);
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#else
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semaphore = CreateSemaphore(0, initialValue, MAXLONG,
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reinterpret_cast<const wchar_t*>(fileName.utf16()));
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#endif
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if (semaphore == NULL)
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setErrorString(QLatin1String("QSystemSemaphore::handle"));
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}
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return semaphore;
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}
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void QSystemSemaphorePrivate::cleanHandle()
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{
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if (semaphore && !CloseHandle(semaphore)) {
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#if defined QSYSTEMSEMAPHORE_DEBUG
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qDebug("QSystemSemaphorePrivate::CloseHandle: sem failed");
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#endif
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}
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semaphore = 0;
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}
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bool QSystemSemaphorePrivate::modifySemaphore(int count)
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{
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if (0 == handle())
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return false;
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if (count > 0) {
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if (0 == ReleaseSemaphore(semaphore, count, 0)) {
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setErrorString(QLatin1String("QSystemSemaphore::modifySemaphore"));
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#if defined QSYSTEMSEMAPHORE_DEBUG
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qDebug("QSystemSemaphore::modifySemaphore ReleaseSemaphore failed");
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#endif
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return false;
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}
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} else {
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if (WAIT_OBJECT_0 != WaitForSingleObjectEx(semaphore, INFINITE, FALSE)) {
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setErrorString(QLatin1String("QSystemSemaphore::modifySemaphore"));
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#if defined QSYSTEMSEMAPHORE_DEBUG
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qDebug("QSystemSemaphore::modifySemaphore WaitForSingleObject failed");
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#endif
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return false;
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}
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}
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clearError();
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return true;
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}
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#endif //QT_NO_SYSTEMSEMAPHORE
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QT_END_NAMESPACE
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