QThread: Destroyed while thread is still running

[wysota]

This is not what I suggested. I suggested checking the stop flag after going through the acquire call. The thing you do in your code snippet you pasted here does nothing. Many things can happen between release() and wait().

[Shuchi Agrawal]

Thanks a lot Wysota. i solved the problem by taking the approach "Your application hangs because the threads are sleeping on their semaphores. You should first make sure the "flag_stop" will really stop them without making one of the threads sleep on its semaphore because of an empty/full buffer - if the "flag_stop" is set when the thread is already sleeping, it might never be woken up." - quoted by you. Thanks a lot