qtqt4nokiacarbide

Reusing QMutex and QWaitCondition

Are QMutex+QWaitCondition objects reusable? I have a method to wait for some threads to complete.

void FinishWait()
{
    mutex.lock();
    waitCondition(&qMutex, ULONG_MAX);
}

The waitCondition.wakeOne() is called on a different Thread.

The first call to FinishWait() works but the the second call doesn't return even if I specify timeout.

Solution

  • Assuming "mutex" and "qMutex" mean the same variable (it doesn't make much sense otherwise), you need to unlock the mutex after the wait() returns.

    void FinishWait()
{
    mutex.lock();
    waitCondition.wait(&mutex);
    mutex.unlock();
}