--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/corelib/kernel/qsharedmemory_win.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,197 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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");
+ QString safeKey = makePlatformSafeKey(key);
+ if (safeKey.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*)safeKey.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*)safeKey.utf16());
+#endif
+ if (!hand) {
+ setErrorString(function);
+ return false;
+ }
+ }
+ return hand;
+}
+
+bool QSharedMemoryPrivate::cleanHandle()
+{
+ if (hand != 0 && !CloseHandle(hand)) {
+ hand = 0;
+ return false;
+ setErrorString(QLatin1String("QSharedMemory::cleanHandle"));
+ }
+ hand = 0;
+ return true;
+}
+
+bool QSharedMemoryPrivate::create(int size)
+{
+ // Get a windows acceptable key
+ QString safeKey = makePlatformSafeKey(key);
+ QString function = QLatin1String("QSharedMemory::create");
+ if (safeKey.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*)safeKey.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;
+
+ // close handle
+ return cleanHandle();
+}
+
+#endif //QT_NO_SHAREDMEMORY
+
+
+QT_END_NAMESPACE