Details
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Bug
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Resolution: Done
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P1: Critical
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4.7.1
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None
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4070bb1daafafabebb3c893a472a22fab413e4de
Description
QFSEventsFileSystemWatcherEngine::addPaths is waiting for the worker thread to start, but it's nowhere to be seen.
This could be related to starting and stopping the worker thread. addPaths calls QThread::start() at some point, but if the thread is
already started and about to exit then nothing will happen.
One possible solution is to rewrite using a QThreadPool with one worker thread, and then create a QRunnable subclass
that does the worker thread tasks.
Sampling process 56983 for 3 seconds with 1 millisecond of run time between samples
Sampling completed, processing symbols...
Analysis of sampling Qt Creator (pid 56983) every 1 millisecond
Call graph:
2306 Thread_3027531 DispatchQueue_1: com.apple.main-thread (serial)
2306 start
2306 main
2306 QCoreApplication::exec()
2306 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
2306 QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
2306 QEventDispatcherMac::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
2306 -[NSApplication run]
2306 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
2306 _DPSNextEvent
2306 BlockUntilNextEventMatchingListInMode
2306 ReceiveNextEventCommon
2306 RunCurrentEventLoopInMode
2306 CFRunLoopRunSpecific
2306 __CFRunLoopRun
2306 __CFMessagePortPerform
2306 CoreDragMessageHandler
2306 DoDropMessage
2306 NSCoreDragReceiveProc
2306 -[QCocoaWindow performDragOperation:]
2306 -[QCocoaView performDragOperation:]
2306 QCoreApplication::notifyInternal(QObject*, QEvent*)
2306 QApplication::notify(QObject*, QEvent*)
2306 QApplicationPrivate::notify_helper(QObject*, QEvent*)
2306 QMainWindow::event(QEvent*)
2306 QWidget::event(QEvent*)
2306 Core::Internal::MainWindow::dropEvent(QDropEvent*)
2306 Core::Internal::MainWindow::openFiles(QStringList const&)
2306 ProjectExplorer::Internal::ProjectFileFactory::open(QString const&)
2306 ProjectExplorer::ProjectExplorerPlugin::openProject(QString const&)
2306 ProjectExplorer::ProjectExplorerPlugin::openProjects(QStringList const&)
2306 ProjectExplorer::Project::restoreSettings()
2306 Qt4ProjectManager::Qt4Project::fromMap(QMap<QString, QVariant> const&)
2306 Qt4ProjectManager::Qt4Project::update()
2306 Qt4ProjectManager::Internal::Qt4ProFileNode::update()
2306 Qt4ProjectManager::Internal::Qt4PriFileNode::Qt4PriFileNode(Qt4ProjectManager::Qt4Project*, Qt4ProjectManager::Internal::Qt4ProFileNode*, QString const&)
2306 Core::FileManager::addFile(Core::IFile*)
2306 Core::FileManager::addFiles(QList<Core::IFile*> const&)
2306 Core::FileManager::addFileInfo(Core::IFile*)
2306 QFileSystemWatcher::addPath(QString const&)
2306 QFileSystemWatcher::addPaths(QStringList const&)
2306 QFSEventsFileSystemWatcherEngine::addPaths(QStringList const&, QStringList*, QStringList*)
2306 QWaitCondition::wait(QMutex*, unsigned long)
2306 _pthread_cond_wait
2306 __semwait_signal
2306 Thread_3027533 DispatchQueue_2: com.apple.libdispatch-manager (serial)
2306 start_wqthread
2306 _pthread_wqthread
2306 _dispatch_worker_thread2
2306 _dispatch_queue_invoke
2306 _dispatch_mgr_invoke
2306 kevent
2306 Thread_3027542
2306 thread_start
2306 _pthread_start
2306 __CFSocketManager
2306 select$DARWIN_EXTSN
2306 Thread_3027544
2306 thread_start
2306 _pthread_start
2306 ne7ssh::selectThread(void*)
2285 usleep
2280 nanosleep
2277 __semwait_signal
3 nanosleep
5 cerror
3 cthread_set_errno_self
2 cerror
9 __bzero
5 ne7ssh::selectThread(void*)
4 ne7ssh::unlock()
2 Ne7ssh_Mutex::unlock()
2 pthread_mutex_unlock
1 ne7ssh::isSelectActive()
1 ne7ssh::unlock()
2 ne7ssh::lock()
1 ne7ssh::getConnetions()
2306 Thread_3027545
2306 thread_start
2306 _pthread_start
2306 QThreadPrivate::start(void*)
2306 QProcessManager::run()
2306 select$DARWIN_EXTSN
2306 Thread_3027548
2306 thread_start
2306 _pthread_start
2306 QTWTF::TCMalloc_PageHeap::runScavengerThread(void*)
2306 QTWTF::TCMalloc_PageHeap::scavengerThread()
2306 _pthread_cond_wait
2306 __semwait_signal
2306 Thread_3027549
2306 thread_start
2306 _pthread_start
2306 WTF::TCMalloc_PageHeap::runScavengerThread(void*)
2306 WTF::TCMalloc_PageHeap::scavengerThread()
2306 _pthread_cond_wait
2306 __semwait_signal
2306 Thread_3027732
2306 thread_start
2306 _pthread_start
2306 QThreadPrivate::start(void*)
2306 CppEditor::Internal::SemanticHighlighter::run()
2306 QWaitCondition::wait(QMutex*, unsigned long)
2306 _pthread_cond_wait
2306 __semwait_signal
Total number in stack (recursive counted multiple, when >=5):
6 _pthread_start
6 thread_start
5 __semwait_signal
Sort by top of stack, same collapsed (when >= 5):
__semwait_signal 11501
select$DARWIN_EXTSN 4612
kevent 2306
__bzero 9
ne7ssh::selectThread(void*) 5
Sample analysis of process 56983 written to file /dev/stdout