The struct is currently storing a pointer to the mutex (which was allocated with malloc). The call to pthread_mutex_destroy does not free that memory. Valgrind

The struct is currently storing a pointer to the mutex (which was allocated with malloc). The call to pthread_mutex_destroy does not free that memory. Valgrind is your friend :) http://valgrind.org/docs/manual/quick-start.html#quick-start.prepare http://valgrind.org/docs/manual/quick-start.html#quick-start...