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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 425 insertions, 0 deletions

diff --git a/src/corelib/io/qfilesystemwatcher_win.cpp b/src/corelib/io/qfilesystemwatcher_win.cpp
new file mode 100644
index 0000000000..26b83b21dc
--- /dev/null
+++ b/src/corelib/io/qfilesystemwatcher_win.cpp
@@ -0,0 +1,425 @@
+/****************************************************************************
+**
+** 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 "qfilesystemwatcher.h"
+#include "qfilesystemwatcher_win_p.h"
+
+#ifndef QT_NO_FILESYSTEMWATCHER
+
+#include <qdebug.h>
+#include <qfileinfo.h>
+#include <qstringlist.h>
+#include <qset.h>
+#include <qdatetime.h>
+#include <qdir.h>
+
+QT_BEGIN_NAMESPACE
+
+void QWindowsFileSystemWatcherEngine::stop()
+{
+    foreach(QWindowsFileSystemWatcherEngineThread *thread, threads)
+        thread->stop();
+}
+
+QWindowsFileSystemWatcherEngine::QWindowsFileSystemWatcherEngine()
+    : QFileSystemWatcherEngine(false)
+{
+}
+
+QWindowsFileSystemWatcherEngine::~QWindowsFileSystemWatcherEngine()
+{
+    if (threads.isEmpty())
+        return;
+
+    foreach(QWindowsFileSystemWatcherEngineThread *thread, threads) {
+        thread->stop();
+        thread->wait();
+        delete thread;
+    }
+}
+
+QStringList QWindowsFileSystemWatcherEngine::addPaths(const QStringList &paths,
+                                                       QStringList *files,
+                                                       QStringList *directories)
+{
+    // qDebug()<<"Adding"<<paths.count()<<"to existing"<<(files->count() + directories->count())<<"watchers";
+    QStringList p = paths;
+    QMutableListIterator<QString> it(p);
+    while (it.hasNext()) {
+        QString path = it.next();
+        QString normalPath = path;
+        if ((normalPath.endsWith(QLatin1Char('/')) && !normalPath.endsWith(QLatin1String(":/")))
+            || (normalPath.endsWith(QLatin1Char('\\')) && !normalPath.endsWith(QLatin1String(":\\")))
+#ifdef Q_OS_WINCE
+            && normalPath.size() > 1)
+#else
+            )
+#endif
+        normalPath.chop(1);
+        QFileInfo fileInfo(normalPath.toLower());
+        if (!fileInfo.exists())
+            continue;
+
+        bool isDir = fileInfo.isDir();
+        if (isDir) {
+            if (directories->contains(path))
+                continue;
+        } else {
+            if (files->contains(path))
+                continue;
+        }
+
+        // qDebug()<<"Looking for a thread/handle for"<<normalPath;
+
+        const QString absolutePath = isDir ? fileInfo.absoluteFilePath() : fileInfo.absolutePath();
+        const uint flags = isDir
+                           ? (FILE_NOTIFY_CHANGE_DIR_NAME
+                              | FILE_NOTIFY_CHANGE_FILE_NAME)
+                           : (FILE_NOTIFY_CHANGE_DIR_NAME
+                              | FILE_NOTIFY_CHANGE_FILE_NAME
+                              | FILE_NOTIFY_CHANGE_ATTRIBUTES
+                              | FILE_NOTIFY_CHANGE_SIZE
+                              | FILE_NOTIFY_CHANGE_LAST_WRITE
+                              | FILE_NOTIFY_CHANGE_SECURITY);
+
+        QWindowsFileSystemWatcherEngine::PathInfo pathInfo;
+        pathInfo.absolutePath = absolutePath;
+        pathInfo.isDir = isDir;
+        pathInfo.path = path;
+        pathInfo = fileInfo;
+
+        // Look for a thread
+        QWindowsFileSystemWatcherEngineThread *thread = 0;
+        QWindowsFileSystemWatcherEngine::Handle handle;
+        QList<QWindowsFileSystemWatcherEngineThread *>::const_iterator jt, end;
+        end = threads.constEnd();
+        for(jt = threads.constBegin(); jt != end; ++jt) {
+            thread = *jt;
+            QMutexLocker locker(&(thread->mutex));
+
+            handle = thread->handleForDir.value(absolutePath);
+            if (handle.handle != INVALID_HANDLE_VALUE && handle.flags == flags) {
+                // found a thread now insert...
+                // qDebug()<<"  Found a thread"<<thread;
+
+                QHash<QString, QWindowsFileSystemWatcherEngine::PathInfo> &h
+                        = thread->pathInfoForHandle[handle.handle];
+                if (!h.contains(fileInfo.absoluteFilePath())) {
+                    thread->pathInfoForHandle[handle.handle].insert(fileInfo.absoluteFilePath(), pathInfo);
+                    if (isDir)
+                        directories->append(path);
+                    else
+                        files->append(path);
+                }
+                it.remove();
+                thread->wakeup();
+                break;
+            }
+        }
+
+        // no thread found, first create a handle
+        if (handle.handle == INVALID_HANDLE_VALUE || handle.flags != flags) {
+            // qDebug()<<"  No thread found";
+            // Volume and folder paths need a trailing slash for proper notification
+            // (e.g. "c:" -> "c:/").
+            const QString effectiveAbsolutePath =
+                    isDir ? (absolutePath + QLatin1Char('/')) : absolutePath;
+
+            handle.handle = FindFirstChangeNotification((wchar_t*) QDir::toNativeSeparators(effectiveAbsolutePath).utf16(), false, flags);
+            handle.flags = flags;
+            if (handle.handle == INVALID_HANDLE_VALUE)
+                continue;
+
+            // now look for a thread to insert
+            bool found = false;
+            foreach(QWindowsFileSystemWatcherEngineThread *thread, threads) {
+                QMutexLocker(&(thread->mutex));
+                if (thread->handles.count() < MAXIMUM_WAIT_OBJECTS) {
+                    // qDebug() << "  Added handle" << handle.handle << "for" << absolutePath << "to watch" << fileInfo.absoluteFilePath();
+                    // qDebug()<< "  to existing thread"<<thread;
+                    thread->handles.append(handle.handle);
+                    thread->handleForDir.insert(absolutePath, handle);
+
+                    thread->pathInfoForHandle[handle.handle].insert(fileInfo.absoluteFilePath(), pathInfo);
+                    if (isDir)
+                        directories->append(path);
+                    else
+                        files->append(path);
+
+                    it.remove();
+                    found = true;
+                    thread->wakeup();
+                    break;
+                }
+            }
+            if (!found) {
+                QWindowsFileSystemWatcherEngineThread *thread = new QWindowsFileSystemWatcherEngineThread();
+                //qDebug()<<"  ###Creating new thread"<<thread<<"("<<(threads.count()+1)<<"threads)";
+                thread->handles.append(handle.handle);
+                thread->handleForDir.insert(absolutePath, handle);
+
+                thread->pathInfoForHandle[handle.handle].insert(fileInfo.absoluteFilePath(), pathInfo);
+                if (isDir)
+                    directories->append(path);
+                else
+                    files->append(path);
+
+                connect(thread, SIGNAL(fileChanged(QString,bool)),
+                        this, SIGNAL(fileChanged(QString,bool)));
+                connect(thread, SIGNAL(directoryChanged(QString,bool)),
+                        this, SIGNAL(directoryChanged(QString,bool)));
+                
+                thread->msg = '@';
+                thread->start();
+                threads.append(thread);
+                it.remove();
+            }
+        }
+    }
+    return p;
+}
+
+QStringList QWindowsFileSystemWatcherEngine::removePaths(const QStringList &paths,
+                                                          QStringList *files,
+                                                          QStringList *directories)
+{
+    // qDebug()<<"removePaths"<<paths;
+    QStringList p = paths;
+    QMutableListIterator<QString> it(p);
+    while (it.hasNext()) {
+        QString path = it.next();
+        QString normalPath = path;
+        if (normalPath.endsWith(QLatin1Char('/')) || normalPath.endsWith(QLatin1Char('\\')))
+            normalPath.chop(1);
+        QFileInfo fileInfo(normalPath.toLower());
+        // qDebug()<<"removing"<<normalPath;
+        QString absolutePath = fileInfo.absoluteFilePath();
+        QList<QWindowsFileSystemWatcherEngineThread *>::iterator jt, end;
+        end = threads.end();
+        for(jt = threads.begin(); jt!= end; ++jt) {
+            QWindowsFileSystemWatcherEngineThread *thread = *jt;
+            if (*jt == 0)
+                continue;
+
+            QMutexLocker locker(&(thread->mutex));
+
+            QWindowsFileSystemWatcherEngine::Handle handle = thread->handleForDir.value(absolutePath);
+            if (handle.handle == INVALID_HANDLE_VALUE) {
+                // perhaps path is a file?
+                absolutePath = fileInfo.absolutePath();
+                handle = thread->handleForDir.value(absolutePath);
+            }
+            if (handle.handle != INVALID_HANDLE_VALUE) {
+                QHash<QString, QWindowsFileSystemWatcherEngine::PathInfo> &h =
+                        thread->pathInfoForHandle[handle.handle];
+                if (h.remove(fileInfo.absoluteFilePath())) {
+                    // ###
+                    files->removeAll(path);
+                    directories->removeAll(path);
+
+                    if (h.isEmpty()) {
+                        // qDebug() << "Closing handle" << handle.handle;
+                        FindCloseChangeNotification(handle.handle);    // This one might generate a notification
+
+                        int indexOfHandle = thread->handles.indexOf(handle.handle);
+                        Q_ASSERT(indexOfHandle != -1);
+                        thread->handles.remove(indexOfHandle);
+
+                        thread->handleForDir.remove(absolutePath);
+                        // h is now invalid
+
+                        it.remove();
+
+                        if (thread->handleForDir.isEmpty()) {
+                            // qDebug()<<"Stopping thread "<<thread;
+                            locker.unlock();
+                            thread->stop();
+                            thread->wait();
+                            locker.relock();
+                            // We can't delete the thread until the mutex locker is
+                            // out of scope
+                        }
+                    }
+                }
+                // Found the file, go to next one
+                break;
+            }
+        }
+    }
+
+    // Remove all threads that we stopped
+    QList<QWindowsFileSystemWatcherEngineThread *>::iterator jt, end;
+    end = threads.end();
+    for(jt = threads.begin(); jt != end; ++jt) {
+        if (!(*jt)->isRunning()) {
+            delete *jt;
+            *jt = 0;
+        }
+    }
+
+    threads.removeAll(0);
+    return p;
+}
+
+///////////
+// QWindowsFileSystemWatcherEngineThread
+///////////
+
+QWindowsFileSystemWatcherEngineThread::QWindowsFileSystemWatcherEngineThread()
+        : msg(0)
+{
+    if (HANDLE h = CreateEvent(0, false, false, 0)) {
+        handles.reserve(MAXIMUM_WAIT_OBJECTS);
+        handles.append(h);
+    }
+    moveToThread(this);
+}
+
+
+QWindowsFileSystemWatcherEngineThread::~QWindowsFileSystemWatcherEngineThread()
+{
+    CloseHandle(handles.at(0));
+    handles[0] = INVALID_HANDLE_VALUE;
+
+    foreach (HANDLE h, handles) {
+        if (h == INVALID_HANDLE_VALUE)
+            continue;
+        FindCloseChangeNotification(h);
+    }
+}
+
+void QWindowsFileSystemWatcherEngineThread::run()
+{
+    QMutexLocker locker(&mutex);
+    forever {
+        QVector<HANDLE> handlesCopy = handles;
+        locker.unlock();
+        // qDebug() << "QWindowsFileSystemWatcherThread"<<this<<"waiting on" << handlesCopy.count() << "handles";
+        DWORD r = WaitForMultipleObjects(handlesCopy.count(), handlesCopy.constData(), false, INFINITE);
+        locker.relock();
+        do {
+            if (r == WAIT_OBJECT_0) {
+                int m = msg;
+                msg = 0;
+                if (m == 'q') {
+                    // qDebug() << "thread"<<this<<"told to quit";
+                    return;
+                }
+                if (m != '@')  {
+                    qDebug("QWindowsFileSystemWatcherEngine: unknown message '%c' send to thread", char(m));
+                }
+                break;
+            } else if (r > WAIT_OBJECT_0 && r < WAIT_OBJECT_0 + uint(handlesCopy.count())) {
+                int at = r - WAIT_OBJECT_0;
+                Q_ASSERT(at < handlesCopy.count());
+                HANDLE handle = handlesCopy.at(at);
+
+                // When removing a path, FindCloseChangeNotification might actually fire a notification
+                // for some reason, so we must check if the handle exist in the handles vector
+                if (handles.contains(handle)) {
+                    // qDebug()<<"thread"<<this<<"Acknowledged handle:"<<at<<handle;
+                    if (!FindNextChangeNotification(handle)) {
+                        qErrnoWarning("QFileSystemWatcher: FindNextChangeNotification failed!!");
+                    }
+
+                    QHash<QString, QWindowsFileSystemWatcherEngine::PathInfo> &h = pathInfoForHandle[handle];
+                    QMutableHashIterator<QString, QWindowsFileSystemWatcherEngine::PathInfo> it(h);
+                    while (it.hasNext()) {
+                        QHash<QString, QWindowsFileSystemWatcherEngine::PathInfo>::iterator x = it.next();
+                        QString absolutePath = x.value().absolutePath;
+                        QFileInfo fileInfo(x.value().path);
+                        // qDebug() << "checking" << x.key();
+                        if (!fileInfo.exists()) {
+                            // qDebug() << x.key() << "removed!";
+                            if (x.value().isDir)
+                                emit directoryChanged(x.value().path, true);
+                            else
+                                emit fileChanged(x.value().path, true);
+                            h.erase(x);
+
+                            // close the notification handle if the directory has been removed
+                            if (h.isEmpty()) {
+                                // qDebug() << "Thread closing handle" << handle;
+                                FindCloseChangeNotification(handle);    // This one might generate a notification
+
+                                int indexOfHandle = handles.indexOf(handle);
+                                Q_ASSERT(indexOfHandle != -1);
+                                handles.remove(indexOfHandle);
+
+                                handleForDir.remove(absolutePath);
+                                // h is now invalid
+                            }
+                        } else if (x.value().isDir) {
+                            // qDebug() << x.key() << "directory changed!";
+                            emit directoryChanged(x.value().path, false);
+                            x.value() = fileInfo;
+                        } else if (x.value() != fileInfo) {
+                            // qDebug() << x.key() << "file changed!";
+                            emit fileChanged(x.value().path, false);
+                            x.value() = fileInfo;
+                        }
+                    }
+                }
+            } else {
+                // qErrnoWarning("QFileSystemWatcher: error while waiting for change notification");
+                break;  // avoid endless loop
+            }
+            handlesCopy = handles;
+            r = WaitForMultipleObjects(handlesCopy.count(), handlesCopy.constData(), false, 0);
+        } while (r != WAIT_TIMEOUT);
+    }
+}
+
+
+void QWindowsFileSystemWatcherEngineThread::stop()
+{
+    msg = 'q';
+    SetEvent(handles.at(0));
+}
+
+void QWindowsFileSystemWatcherEngineThread::wakeup()
+{
+    msg = '@';
+    SetEvent(handles.at(0));
+}
+
+QT_END_NAMESPACE
+#endif // QT_NO_FILESYSTEMWATCHER