| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtCore module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
| ** a written agreement between you and The Qt Company. For licensing terms |
| ** and conditions see https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** GNU Lesser General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU Lesser |
| ** General Public License version 3 as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.LGPL3 included in the |
| ** packaging of this file. Please review the following information to |
| ** ensure the GNU Lesser General Public License version 3 requirements |
| ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 |
| ** included in the packaging of this file. Please review the following |
| ** information to ensure the GNU General Public License requirements will |
| ** be met: https://www.gnu.org/licenses/gpl-2.0.html and |
| ** https://www.gnu.org/licenses/gpl-3.0.html. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "qsystemsemaphore.h" |
| #include "qsystemsemaphore_p.h" |
| #include "qcoreapplication.h" |
| #include <qdebug.h> |
| #include <qt_windows.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) { |
| #if defined(Q_OS_WINRT) |
| semaphore = CreateSemaphoreEx(0, initialValue, MAXLONG, |
| reinterpret_cast<const wchar_t*>(fileName.utf16()), |
| 0, SEMAPHORE_ALL_ACCESS); |
| #else |
| semaphore = CreateSemaphore(0, initialValue, MAXLONG, |
| reinterpret_cast<const wchar_t*>(fileName.utf16())); |
| #endif |
| if (semaphore == NULL) |
| setErrorString(QLatin1String("QSystemSemaphore::handle")); |
| } |
| |
| return semaphore; |
| } |
| |
| void QSystemSemaphorePrivate::cleanHandle() |
| { |
| if (semaphore && !CloseHandle(semaphore)) { |
| #if defined QSYSTEMSEMAPHORE_DEBUG |
| qDebug("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("QSystemSemaphore::modifySemaphore ReleaseSemaphore failed"); |
| #endif |
| return false; |
| } |
| } else { |
| if (WAIT_OBJECT_0 != WaitForSingleObjectEx(semaphore, INFINITE, FALSE)) { |
| setErrorString(QLatin1String("QSystemSemaphore::modifySemaphore")); |
| #if defined QSYSTEMSEMAPHORE_DEBUG |
| qDebug("QSystemSemaphore::modifySemaphore WaitForSingleObject failed"); |
| #endif |
| return false; |
| } |
| } |
| |
| clearError(); |
| return true; |
| } |
| |
| #endif //QT_NO_SYSTEMSEMAPHORE |
| |
| QT_END_NAMESPACE |