QDnotifyFileSystemWatcherEngine Class Reference

#include <qfilesystemwatcher_dnotify_p.h>

Inheritance diagram for QDnotifyFileSystemWatcherEngine:

Classes
struct	Directory

Public Functions
QStringList	addPaths (const QStringList &paths, QStringList *files, QStringList *directories)
QStringList	removePaths (const QStringList &paths, QStringList *files, QStringList *directories)
void	run ()
	The starting point for the thread. More...
void	stop ()
virtual	~QDnotifyFileSystemWatcherEngine ()
Public Functions inherited from QThread
void	exit (int retcode=0)
	Tells the thread's event loop to exit with a return code. More...
bool	isFinished () const
	Returns true if the thread is finished; otherwise returns false. More...
bool	isRunning () const
	Returns true if the thread is running; otherwise returns false. More...
Priority	priority () const
	Returns the priority for a running thread. More...
	QThread (QObject *parent=0)
	Constructs a new QThread to manage a new thread. More...
void	setPriority (Priority priority)
	This function sets the priority for a running thread. More...
void	setStackSize (uint stackSize)
	Sets the maximum stack size for the thread to stackSize. More...
uint	stackSize () const
	Returns the maximum stack size for the thread (if set with setStackSize()); otherwise returns zero. More...
bool	wait (unsigned long time=ULONG_MAX)
	Blocks the thread until either of these conditions is met: More...
	~QThread ()
	Destroys the QThread. More...
Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...
const QObjectList &	children () const
	Returns a list of child objects. More...
bool	connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0)
bool	disconnect (const QObject *receiver, const char *member=0)
void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...
void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...
QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...
virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...
virtual bool	eventFilter (QObject *, QEvent *)
	Filters events if this object has been installed as an event filter for the watched object. More...
template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...
template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...
template<typename T >
QList< T >	findChildren (const QRegExp &re) const
bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...
void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...
bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...
void	killTimer (int id)
	Kills the timer with timer identifier, id. More...
virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...
void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...
QString	objectName () const
QObject *	parent () const
	Returns a pointer to the parent object. More...
QVariant	property (const char *name) const
	Returns the value of the object's name property. More...
Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...
void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...
void	setObjectName (const QString &name)
void	setParent (QObject *)
	Makes the object a child of parent. More...
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...
void	setUserData (uint id, QObjectUserData *data)
bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...
int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...
QThread *	thread () const
	Returns the thread in which the object lives. More...
QObjectUserData *	userData (uint id) const
virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Static Public Functions
static QDnotifyFileSystemWatcherEngine *	create ()
Static Public Functions inherited from QThread
static QThread *	currentThread ()
	Returns a pointer to a QThread which manages the currently executing thread. More...
static Qt::HANDLE	currentThreadId ()
	Returns the thread handle of the currently executing thread. More...
static int	idealThreadCount ()
	Returns the ideal number of threads that can be run on the system. More...
static void	yieldCurrentThread ()
	Yields execution of the current thread to another runnable thread, if any. More...
Static Public Functions inherited from QObject
static bool	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...
static bool	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
static bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
	Disconnects signal in object sender from method in object receiver. More...
static bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
static uint	registerUserData ()
static QString	tr (const char *sourceText, const char *comment=0, int n=-1)
static QString	trUtf8 (const char *sourceText, const char *comment=0, int n=-1)

Private Slots
void	refresh (int)

Private Functions
	QDnotifyFileSystemWatcherEngine ()

Properties
QHash< int, Directory >	fdToDirectory
QMutex	mutex
QHash< int, int >	parentToFD
QHash< QString, int >	pathToFD

Additional Inherited Members
Public Types inherited from QThread
enum	Priority {   IdlePriority, LowestPriority, LowPriority, NormalPriority,   HighPriority, HighestPriority, TimeCriticalPriority, InheritPriority }
	This enum type indicates how the operating system should schedule newly created threads. More...
Public Slots inherited from QThread
void	quit ()
	Tells the thread's event loop to exit with return code 0 (success). More...
void	start (Priority=InheritPriority)
	Begins execution of the thread by calling run(). More...
void	terminate ()
	Terminates the execution of the thread. More...
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...
Signals inherited from QFileSystemWatcherEngine
void	directoryChanged (const QString &path, bool removed)
void	fileChanged (const QString &path, bool removed)
Signals inherited from QThread
void	finished ()
	This signal is emitted when the thread has finished executing. More...
void	started ()
	This signal is emitted when the thread starts executing. More...
void	terminated ()
	This signal is emitted when the thread is terminated. More...
Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...
Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...
Protected Functions inherited from QFileSystemWatcherEngine
	QFileSystemWatcherEngine (bool move=true)
Protected Functions inherited from QThread
int	exec ()
	Enters the event loop and waits until exit() is called, returning the value that was passed to exit(). More...
	QThread (QThreadPrivate &dd, QObject *parent=0)
Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...
virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...
virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...
virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...
	QObject (QObjectPrivate &dd, QObject *parent=0)
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...
int	senderSignalIndex () const
virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...
Static Protected Functions inherited from QThread
static void	msleep (unsigned long)
	Forces the current thread to sleep for msecs milliseconds. More...
static void	setTerminationEnabled (bool enabled=true)
	Enables or disables termination of the current thread based on the enabled parameter. More...
static void	sleep (unsigned long)
	Forces the current thread to sleep for secs seconds. More...
static void	usleep (unsigned long)
	Forces the current thread to sleep for usecs microseconds. More...
Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr
Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject
Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()
T *	qobject_cast (QObject *object)
	QObjectList
void *	qt_find_obj_child (QObject *parent, const char *type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

Definition at line 67 of file qfilesystemwatcher_dnotify_p.h.

Constructors and Destructors

~QDnotifyFileSystemWatcherEngine()

QDnotifyFileSystemWatcherEngine::~QDnotifyFileSystemWatcherEngine ( )

virtual

Definition at line 204 of file qfilesystemwatcher_dnotify.cpp.

{
    QMutexLocker locker(&mutex);

    for(QHash<int, Directory>::ConstIterator iter = fdToDirectory.constBegin();
            iter != fdToDirectory.constEnd();
            ++iter) {
        qt_safe_close(iter->fd);
        if(iter->parentFd)
            qt_safe_close(iter->parentFd);
    }
}

QDnotifyFileSystemWatcherEngine()

QDnotifyFileSystemWatcherEngine::QDnotifyFileSystemWatcherEngine ( )

private

Definition at line 198 of file qfilesystemwatcher_dnotify.cpp.

{
    QObject::connect(dnotifySignal(), SIGNAL(fdChanged(int)),
                     this, SLOT(refresh(int)), Qt::DirectConnection);
}

Functions

addPaths()

QStringList QDnotifyFileSystemWatcherEngine::addPaths ( const QStringList &  paths, QStringList *  files, QStringList *  directories  )

virtual

Implements QFileSystemWatcherEngine.

Definition at line 227 of file qfilesystemwatcher_dnotify.cpp.

{
    QMutexLocker locker(&mutex);

    QStringList p = paths;
    QMutableListIterator<QString> it(p);

    while (it.hasNext()) {
        QString path = it.next();

        QFileInfo fi(path);

        if(!fi.exists()) {
            continue;
        }

        bool isDir = fi.isDir();

        if (isDir && directories->contains(path)) {
            continue; // Skip monitored directories
        } else if(!isDir && files->contains(path)) {
            continue; // Skip monitored files
        }

        if(!isDir)
            path = fi.canonicalPath();

        // Locate the directory entry (creating if needed)
        int fd = pathToFD[path];

        if(fd == 0) {

            QT_DIR *d = QT_OPENDIR(path.toUtf8().constData());
            if(!d) continue; // Could not open directory
            QT_DIR *parent = 0;

            QDir parentDir(path);
            if(!parentDir.isRoot()) {
                parentDir.cdUp();
                parent = QT_OPENDIR(parentDir.path().toUtf8().constData());
                if(!parent) {
                    QT_CLOSEDIR(d);
                    continue;
                }
            }

            fd = qt_safe_dup(::dirfd(d));
            int parentFd = parent ? qt_safe_dup(::dirfd(parent)) : 0;

            QT_CLOSEDIR(d);
            if(parent) QT_CLOSEDIR(parent);

            Q_ASSERT(fd);
            if(::fcntl(fd, F_SETSIG, SIGIO) ||
               ::fcntl(fd, F_NOTIFY, DN_MODIFY | DN_CREATE | DN_DELETE |
                                     DN_RENAME | DN_ATTRIB | DN_MULTISHOT) ||
               (parent && ::fcntl(parentFd, F_SETSIG, SIGIO)) ||
               (parent && ::fcntl(parentFd, F_NOTIFY, DN_DELETE | DN_RENAME |
                                            DN_MULTISHOT))) {
                continue; // Could not set appropriate flags
            }

            Directory dir;
            dir.path = path;
            dir.fd = fd;
            dir.parentFd = parentFd;

            fdToDirectory.insert(fd, dir);
            pathToFD.insert(path, fd);
            if(parentFd)
                parentToFD.insert(parentFd, fd);
        }

        Directory &directory = fdToDirectory[fd];

        if(isDir) {
            directory.isMonitored = true;
        } else {
            Directory::File file;
            file.path = fi.filePath();
            file.lastWrite = fi.lastModified();
            directory.files.append(file);
            pathToFD.insert(fi.filePath(), fd);
        }

        it.remove();

        if(isDir) {
            directories->append(path);
        } else {
            files->append(fi.filePath());
        }
    }

    dnotifySignal()->startNotify();

    return p;
}

create()

QDnotifyFileSystemWatcherEngine * QDnotifyFileSystemWatcherEngine::create ( )

static

Definition at line 217 of file qfilesystemwatcher_dnotify.cpp.

Referenced by QFileSystemWatcherPrivate::initForcedEngine().

{
    return new QDnotifyFileSystemWatcherEngine();
}

refresh

void QDnotifyFileSystemWatcherEngine::refresh ( int  fd )

privateslot

Definition at line 373 of file qfilesystemwatcher_dnotify.cpp.

{
    QMutexLocker locker(&mutex);

    bool wasParent = false;
    QHash<int, Directory>::Iterator iter = fdToDirectory.find(fd);
    if(iter == fdToDirectory.end()) {
        QHash<int, int>::Iterator pIter = parentToFD.find(fd);
        if(pIter == parentToFD.end())
            return;

        iter = fdToDirectory.find(*pIter);
        if (iter == fdToDirectory.end())
            return;
        wasParent = true;
    }

    Directory &directory = *iter;

    if(!wasParent) {
        for(int ii = 0; ii < directory.files.count(); ++ii) {
            Directory::File &file = directory.files[ii];
            if(file.updateInfo()) {
                // Emit signal
                QString filePath = file.path;
                bool removed = !QFileInfo(filePath).exists();

                if(removed) {
                    directory.files.removeAt(ii);
                    --ii;
                }

                emit fileChanged(filePath, removed);
            }
        }
    }

    if(directory.isMonitored) {
        // Emit signal
        bool removed = !QFileInfo(directory.path).exists();
        QString path = directory.path;

        if(removed)
            directory.isMonitored = false;

        emit directoryChanged(path, removed);
    }

    if(!directory.isMonitored && directory.files.isEmpty()) {
        qt_safe_close(directory.fd);
        if(directory.parentFd) {
            qt_safe_close(directory.parentFd);
            parentToFD.remove(directory.parentFd);
        }
        fdToDirectory.erase(iter);
    }
}

removePaths()

QStringList QDnotifyFileSystemWatcherEngine::removePaths ( const QStringList &  paths, QStringList *  files, QStringList *  directories  )

virtual

Implements QFileSystemWatcherEngine.

Definition at line 326 of file qfilesystemwatcher_dnotify.cpp.

{
    QMutexLocker locker(&mutex);

    QStringList p = paths;
    QMutableListIterator<QString> it(p);
    while (it.hasNext()) {

        QString path = it.next();
        int fd = pathToFD.take(path);

        if(!fd)
            continue;

        Directory &directory = fdToDirectory[fd];
        bool isDir = false;
        if(directory.path == path) {
            isDir = true;
            directory.isMonitored = false;
        } else {
            for(int ii = 0; ii < directory.files.count(); ++ii) {
                if(directory.files.at(ii).path == path) {
                    directory.files.removeAt(ii);
                    break;
                }
            }
        }

        if(!directory.isMonitored && directory.files.isEmpty()) {
            // No longer needed
            qt_safe_close(directory.fd);
            pathToFD.remove(directory.path);
            fdToDirectory.remove(fd);
        }

        if(isDir) {
            directories->removeAll(path);
        } else {
            files->removeAll(path);
        }

        it.remove();
    }

    return p;
}

run()

void QDnotifyFileSystemWatcherEngine::run ( void  )

virtual

The starting point for the thread.

After calling start(), the newly created thread calls this function. The default implementation simply calls exec().

You can reimplement this function to facilitate advanced thread management. Returning from this method will end the execution of the thread.

See also

start() wait()

Reimplemented from QThread.

Definition at line 222 of file qfilesystemwatcher_dnotify.cpp.

{
    qFatal("QDnotifyFileSystemWatcherEngine thread should not be run");
}

stop()

void QDnotifyFileSystemWatcherEngine::stop ( )

virtual

Implements QFileSystemWatcherEngine.

Definition at line 431 of file qfilesystemwatcher_dnotify.cpp.

{
}

Properties

fdToDirectory

QHash<int, Directory> QDnotifyFileSystemWatcherEngine::fdToDirectory

private

Definition at line 123 of file qfilesystemwatcher_dnotify_p.h.

mutex

QMutex QDnotifyFileSystemWatcherEngine::mutex

private

Definition at line 121 of file qfilesystemwatcher_dnotify_p.h.

parentToFD

QHash<int, int> QDnotifyFileSystemWatcherEngine::parentToFD

private

Definition at line 124 of file qfilesystemwatcher_dnotify_p.h.

pathToFD

QHash<QString, int> QDnotifyFileSystemWatcherEngine::pathToFD

private

Definition at line 122 of file qfilesystemwatcher_dnotify_p.h.

---

The documentation for this class was generated from the following files:

• /src/corelib/io/qfilesystemwatcher_dnotify_p.h
• /src/corelib/io/qfilesystemwatcher_dnotify.cpp