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Remove unnecessary QMutexes in QFileSystemWatcher implementations

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The polling, inotify, and kqueue implementations are no longer threaded,
and as such, do not need mutexes to protect their internal data (since
QFileSystemWatcher itself is not documented as a thread-safe API).

The Windows implementation is unchanged as it uses multiple threads
explicitly.

Change-Id: Ia82510397e576bf704ce3aed3d776b58b39f7ff3
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: João Abecasis <joao.abecasis@nokia.com>
This commit is contained in:
Bradley T. Hughes 2012-01-11 09:00:41 +01:00 committed by Qt by Nokia
parent d6e0306a90
commit 93a466c6fc
7 changed files with 78 additions and 99 deletions
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1
src/corelib/io/qfilesystemwatcher.cpp
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@ -48,7 +48,6 @@
#include <qdebug.h> #include <qdebug.h>
#include <qdir.h> #include <qdir.h>
#include <qfileinfo.h> #include <qfileinfo.h>
#include <qmutex.h>
#include <qset.h> #include <qset.h>
#include <qtimer.h> #include <qtimer.h>

6
src/corelib/io/qfilesystemwatcher_inotify.cpp
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@ -245,8 +245,6 @@ QStringList QInotifyFileSystemWatcherEngine::addPaths(const QStringList &paths,
QStringList *files, QStringList *files,
QStringList *directories) QStringList *directories)
{ {
QMutexLocker locker(&mutex);
QStringList p = paths; QStringList p = paths;
QMutableListIterator<QString> it(p); QMutableListIterator<QString> it(p);
while (it.hasNext()) { while (it.hasNext()) {
@ -303,8 +301,6 @@ QStringList QInotifyFileSystemWatcherEngine::removePaths(const QStringList &path
QStringList *files, QStringList *files,
QStringList *directories) QStringList *directories)
{ {
QMutexLocker locker(&mutex);
QStringList p = paths; QStringList p = paths;
QMutableListIterator<QString> it(p); QMutableListIterator<QString> it(p);
while (it.hasNext()) { while (it.hasNext()) {
@ -331,8 +327,6 @@ QStringList QInotifyFileSystemWatcherEngine::removePaths(const QStringList &path
void QInotifyFileSystemWatcherEngine::readFromInotify() void QInotifyFileSystemWatcherEngine::readFromInotify()
{ {
QMutexLocker locker(&mutex);
// qDebug() << "QInotifyFileSystemWatcherEngine::readFromInotify"; // qDebug() << "QInotifyFileSystemWatcherEngine::readFromInotify";
int buffSize = 0; int buffSize = 0;

1
src/corelib/io/qfilesystemwatcher_inotify_p.h
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@ -81,7 +81,6 @@ private Q_SLOTS:
private: private:
QInotifyFileSystemWatcherEngine(int fd); QInotifyFileSystemWatcherEngine(int fd);
int inotifyFd; int inotifyFd;
QMutex mutex;
QHash<QString, int> pathToID; QHash<QString, int> pathToID;
QHash<int, QString> idToPath; QHash<int, QString> idToPath;
QSocketNotifier notifier; QSocketNotifier notifier;

8
src/corelib/io/qfilesystemwatcher_kqueue.cpp
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@ -98,9 +98,6 @@ QStringList QKqueueFileSystemWatcherEngine::addPaths(const QStringList &paths,
QStringList *directories) QStringList *directories)
{ {
QStringList p = paths; QStringList p = paths;
{
QMutexLocker locker(&mutex);
QMutableListIterator<QString> it(p); QMutableListIterator<QString> it(p);
while (it.hasNext()) { while (it.hasNext()) {
QString path = it.next(); QString path = it.next();
@ -168,7 +165,6 @@ QStringList QKqueueFileSystemWatcherEngine::addPaths(const QStringList &paths,
pathToID.insert(path, id); pathToID.insert(path, id);
idToPath.insert(id, path); idToPath.insert(id, path);
} }
}
return p; return p;
} }
@ -179,8 +175,6 @@ QStringList QKqueueFileSystemWatcherEngine::removePaths(const QStringList &paths
{ {
bool isEmpty; bool isEmpty;
QStringList p = paths; QStringList p = paths;
{
QMutexLocker locker(&mutex);
if (pathToID.isEmpty()) if (pathToID.isEmpty())
return p; return p;
@ -201,7 +195,6 @@ QStringList QKqueueFileSystemWatcherEngine::removePaths(const QStringList &paths
files->removeAll(path); files->removeAll(path);
} }
isEmpty = pathToID.isEmpty(); isEmpty = pathToID.isEmpty();
}
return p; return p;
} }
@ -224,7 +217,6 @@ void QKqueueFileSystemWatcherEngine::readFromKqueue()
int fd = kev.ident; int fd = kev.ident;
DEBUG() << "QKqueueFileSystemWatcherEngine: processing kevent" << kev.ident << kev.filter; DEBUG() << "QKqueueFileSystemWatcherEngine: processing kevent" << kev.ident << kev.filter;
QMutexLocker locker(&mutex);
int id = fd; int id = fd;
QString path = idToPath.value(id); QString path = idToPath.value(id);

1
src/corelib/io/qfilesystemwatcher_kqueue_p.h
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@ -85,7 +85,6 @@ private:
int kqfd; int kqfd;
QMutex mutex;
QHash<QString, int> pathToID; QHash<QString, int> pathToID;
QHash<int, QString> idToPath; QHash<int, QString> idToPath;
QSocketNotifier notifier; QSocketNotifier notifier;

3
src/corelib/io/qfilesystemwatcher_polling.cpp
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@ -54,7 +54,6 @@ QStringList QPollingFileSystemWatcherEngine::addPaths(const QStringList &paths,
QStringList *files, QStringList *files,
QStringList *directories) QStringList *directories)
{ {
QMutexLocker locker(&mutex);
QStringList p = paths; QStringList p = paths;
QMutableListIterator<QString> it(p); QMutableListIterator<QString> it(p);
while (it.hasNext()) { while (it.hasNext()) {
@ -89,7 +88,6 @@ QStringList QPollingFileSystemWatcherEngine::removePaths(const QStringList &path
QStringList *files, QStringList *files,
QStringList *directories) QStringList *directories)
{ {
QMutexLocker locker(&mutex);
QStringList p = paths; QStringList p = paths;
QMutableListIterator<QString> it(p); QMutableListIterator<QString> it(p);
while (it.hasNext()) { while (it.hasNext()) {
@ -113,7 +111,6 @@ QStringList QPollingFileSystemWatcherEngine::removePaths(const QStringList &path
void QPollingFileSystemWatcherEngine::timeout() void QPollingFileSystemWatcherEngine::timeout()
{ {
QMutexLocker locker(&mutex);
QMutableHashIterator<QString, FileInfo> fit(files); QMutableHashIterator<QString, FileInfo> fit(files);
while (fit.hasNext()) { while (fit.hasNext()) {
QHash<QString, FileInfo>::iterator x = fit.next(); QHash<QString, FileInfo>::iterator x = fit.next();

1
src/corelib/io/qfilesystemwatcher_polling_p.h
View File

@ -105,7 +105,6 @@ class QPollingFileSystemWatcherEngine : public QFileSystemWatcherEngine
} }
}; };
mutable QMutex mutex;
QHash<QString, FileInfo> files, directories; QHash<QString, FileInfo> files, directories;
public: public: