Hi Yann, thanks for your explanation.
Am 16.05.2015 um 19:05 schrieb Yann Ylavic: >> Trying to get locked mutex... timed out after 1 second (expected) >> Child trying to unlock the mutex got 1 (unexpected) >> Trying to get locked mutex... timed out after 2 seconds (unexpected) >> >> Did I do anything wrong? > > A mutex must be unlocked by the thread which locked it (error 1 is EPERM). Ok, makes sense to me. Regards, Micha