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Diffstat (limited to 'src/corelib/kernel/qsharedmemory_win.cpp')
-rw-r--r-- | src/corelib/kernel/qsharedmemory_win.cpp | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/src/corelib/kernel/qsharedmemory_win.cpp b/src/corelib/kernel/qsharedmemory_win.cpp new file mode 100644 index 0000000000..bc13e338bd --- /dev/null +++ b/src/corelib/kernel/qsharedmemory_win.cpp @@ -0,0 +1,195 @@ +/**************************************************************************** +** +** 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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 Technology Preview License Agreement accompanying +** this package. +** +** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qsharedmemory.h" +#include "qsharedmemory_p.h" +#include "qsystemsemaphore.h" +#include <qdebug.h> + +QT_BEGIN_NAMESPACE + +#ifndef QT_NO_SHAREDMEMORY + +QSharedMemoryPrivate::QSharedMemoryPrivate() : QObjectPrivate(), + memory(0), size(0), error(QSharedMemory::NoError), + systemSemaphore(QString()), lockedByMe(false), hand(0) +{ +} + +void QSharedMemoryPrivate::setErrorString(const QString &function) +{ + BOOL windowsError = GetLastError(); + if (windowsError == 0) + return; + switch (windowsError) { + case ERROR_ALREADY_EXISTS: + error = QSharedMemory::AlreadyExists; + errorString = QSharedMemory::tr("%1: already exists").arg(function); + break; + case ERROR_FILE_NOT_FOUND: +#ifdef Q_OS_WINCE + // This happens on CE only if no file is present as CreateFileMappingW + // bails out with this error code + case ERROR_INVALID_PARAMETER: +#endif + error = QSharedMemory::NotFound; + errorString = QSharedMemory::tr("%1: doesn't exist").arg(function); + break; + case ERROR_COMMITMENT_LIMIT: + error = QSharedMemory::InvalidSize; + errorString = QSharedMemory::tr("%1: invalid size").arg(function); + break; + case ERROR_NO_SYSTEM_RESOURCES: + case ERROR_NOT_ENOUGH_MEMORY: + error = QSharedMemory::OutOfResources; + errorString = QSharedMemory::tr("%1: out of resources").arg(function); + break; + case ERROR_ACCESS_DENIED: + error = QSharedMemory::PermissionDenied; + errorString = QSharedMemory::tr("%1: permission denied").arg(function); + break; + default: + errorString = QSharedMemory::tr("%1: unknown error %2").arg(function).arg(windowsError); + error = QSharedMemory::UnknownError; +#if defined QSHAREDMEMORY_DEBUG + qDebug() << errorString << "key" << key; +#endif + } +} + +HANDLE QSharedMemoryPrivate::handle() +{ + if (!hand) { + QString function = QLatin1String("QSharedMemory::handle"); + if (nativeKey.isEmpty()) { + error = QSharedMemory::KeyError; + errorString = QSharedMemory::tr("%1: unable to make key").arg(function); + return false; + } +#ifndef Q_OS_WINCE + hand = OpenFileMapping(FILE_MAP_ALL_ACCESS, false, (wchar_t*)nativeKey.utf16()); +#else + // This works for opening a mapping too, but always opens it with read/write access in + // attach as it seems. + hand = CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, 0, (wchar_t*)nativeKey.utf16()); +#endif + if (!hand) { + setErrorString(function); + return false; + } + } + return hand; +} + +bool QSharedMemoryPrivate::cleanHandle() +{ + if (hand != 0 && !CloseHandle(hand)) { + hand = 0; + setErrorString(QLatin1String("QSharedMemory::cleanHandle")); + return false; + } + hand = 0; + return true; +} + +bool QSharedMemoryPrivate::create(int size) +{ + QString function = QLatin1String("QSharedMemory::create"); + if (nativeKey.isEmpty()) { + error = QSharedMemory::KeyError; + errorString = QSharedMemory::tr("%1: key error").arg(function); + return false; + } + + // Create the file mapping. + hand = CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, size, (wchar_t*)nativeKey.utf16()); + setErrorString(function); + + // hand is valid when it already exists unlike unix so explicitly check + if (error == QSharedMemory::AlreadyExists || !hand) + return false; + + return true; +} + +bool QSharedMemoryPrivate::attach(QSharedMemory::AccessMode mode) +{ + // Grab a pointer to the memory block + int permissions = (mode == QSharedMemory::ReadOnly ? FILE_MAP_READ : FILE_MAP_ALL_ACCESS); + memory = (void *)MapViewOfFile(handle(), permissions, 0, 0, 0); + if (0 == memory) { + setErrorString(QLatin1String("QSharedMemory::attach")); + cleanHandle(); + return false; + } + + // Grab the size of the memory we have been given (a multiple of 4K on windows) + MEMORY_BASIC_INFORMATION info; + if (!VirtualQuery(memory, &info, sizeof(info))) { + // Windows doesn't set an error code on this one, + // it should only be a kernel memory error. + error = QSharedMemory::UnknownError; + errorString = QSharedMemory::tr("%1: size query failed").arg(QLatin1String("QSharedMemory::attach: ")); + return false; + } + size = info.RegionSize; + + return true; +} + +bool QSharedMemoryPrivate::detach() +{ + // umap memory + if (!UnmapViewOfFile(memory)) { + setErrorString(QLatin1String("QSharedMemory::detach")); + return false; + } + memory = 0; + size = 0; + + // close handle + return cleanHandle(); +} + +#endif //QT_NO_SHAREDMEMORY + + +QT_END_NAMESPACE |