QMutex: destroying locked mutex What the ***?

Kofr

When closing my app I get
QMutex: destroying locked mutex
I do not get the reason of this.
I found this messge in sources, but I do not get what is the problem and how to fix it.

QMutex::~QMutex()
193	{
194	    QMutexData *d = d_ptr.load();
195	    if (isRecursive()) {
196	        delete static_cast<QRecursiveMutexPrivate *>(d);
197	    } else if (d) {
198	#ifndef QT_LINUX_FUTEX
199	        if (d != dummyLocked() && static_cast<QMutexPrivate *>(d)->possiblyUnlocked.load()
200	            && tryLock()) {
201	            unlock();
202	            return;
203	        }
204	#endif
205	        qWarning("QMutex: destroying locked mutex");
206	    }
207	}

The mutex is in global static object (instance of singlton) and is used from other thread (it has queued connection)
What the problem is?

mrjj

Hi

Well, did u use a QMutex in your app ?

Or did you use a QThread ? If you dont stop it correctly it might say so.

Kofr

@mrjj i HAVE 3 THREADS in the app.
GUI thread, Worker thread, tasks queue manager

I use QMutex in queue object in methods which enqueue and dequeue the queue because the queue is accessed from Worker thread, tasks queue manager threads.

the way I exit threads is smth like

CalculatingThread::~CalculatingThread() {
    quit();
    if(!wait(3000)) //Wait until it actually has terminated (max. 3 sec)
    {
        terminate(); //Thread didn't exit in time, probably deadlocked, terminate it!
        wait(); //We have to wait again here!
    }
}

aha_1980

@Kofr and are you sure the mutex is not locked whe you exit your program ?

JonB

@Kofr
I you place breakpoint at line #205 of ~QMutex() you can see which of your mutexes is the culprit, which may help you.