Something wrong with QWaitCondition

[yvvan]

For a long time i compiled my program only on Linux with qt 4.6.2. But then decided to watch it on my windows xp using qt creator with qt 4.7.0. What happened: on linux every signal was sent to gui thread and waked second thread, but in windows it (sending signal) worked only for 1-4 times and then second thread went to wait condition forever.
I have main gui thread and second thread, that calls wait() function for lots of times.

in my second thread:
@
ther is class Finder

QWaitCondition wCond;
QMutex sync;
QImage img;
void imageRecieved(QImage screenshot);
signals:
void needScreenshot();

void Finder::wait()
{
QTest::qSleep(50);
sync.lock();
emit needScreenshot();
wCond.wait(&sync);
sync.unlock();
}
void Finder::imageRecieved(QImage screenshot)
{
img = screenshot;
wCond.wakeOne();
}
@

@
in main gui thread

Finder* finder;

QObject::connect(finder, SIGNAL(needScreenshot()),SLOT(makeScreeshot()));

void makeScreeshot()
{
unsigned long windowId;
windowId=sc.getHeroesWinId(mainWinForm_.lineEdit->text());//returns window id depends on system, i can list it's code if needed
if(windowId == 0)
{
QImage img;
finder->imageRecieved(img);
return;
}
QPixmap pixmap = QPixmap::grabWindow((WId)windowId);
QImage img(pixmap.toImage());
finder->imageRecieved(img);
}
@

[giesbert]

I don't know what exactly is your problem, but

I would use QMutexLocker lock(&sync); in wait().

In imageRecieved() I would do the same:

@
void Finder::imageRecieved(QImage screenshot)
{
QMutexLocker lock(&sync);
img = screenshot;
wCond.wakeOne();
}
@