Synchronization problem with wxCondition and wxMutex

[Chris]

Hi,

I have a synchronization problem. I have extended a ListCtrl that
always checks for updates in a thread and updates the contents of the
ListCtrl. In the below code simplified code you can see
MappingListView::Start and MappingListView::Stop functions. I call
these when I want to pause the updating of the ListCtrl. The thread
itself is always running but waiting for a signal emitted in the
MappingListView::Start function.

Somehow the code deadlocks. The signal seems to get lost and the wait
not returning. I used mutexes as described in the documentation to
prevent signals to be lost. But I seem to do something wrong.

Any suggestions are highly welcome!
Thanks, Chris

You can find this simplified code also at: http://pastebin.com/m5fc1645c

wxCondition* waitForRunning;
wxCondition* waitForPaused;
wxMutex waitForRunningMutex;
wxMutex waitForPausedMutex;
volatile bool paused;

MappingListView::MappingListView (...)
{
	waitForRunning = new wxCondition (waitForRunningMutex);
	waitForPaused	= new wxCondition (waitForPausedMutex);

	waitForRunningMutex.Lock ();
	waitForPausedMutex.Lock  ();

	paused = false;
	wxThread::Create ();
}

void MappingListView::Start ()
{
	if (paused) {

		paused = false;

		waitForRunningMutex.Lock	();
		waitForRunning->Signal		();
		waitForRunningMutex.Unlock	();

	} else {

		wxThread::Run();

	}
}

void MappingListView::Stop ()
{
	paused = true;
	waitForPaused->Wait ();
}

wxThread::ExitCode MappingListView::Entry ()
{
	while (! wxThread::TestDestroy ()) {

		if (paused) {

			waitForPausedMutex.Lock		();
			waitForPaused->Signal		();
			waitForPausedMutex.Unlock	();

			waitForRunning->Wait ();
		}

		if (wxThread::TestDestroy ()) break;

		//
		// DO PERIODIC THREAD WORK HERE
		//

	}

	return 0;
}