when unlocking an unlocked mutex, pthread_mutex_unlock() should always produce EPERM for any type of mutex -- see test mutex7.c
when unlocking an unlocked mutex, pthread_mutex_unlock() should always produce EPERM for any type of mutex -- see test mutex7.c

nicolaichuk/pthread-win32,nicolaichuk/pthread-win32,nicolaichuk/pthread-win32,nicolaichuk/pthread-win32