Update for bug 4923 - Calling SDL_GameControllerRumble() often takes 8 ms meyraud705 Dualshock4 on bluetooth need 78 bytes for the rumble data while SDL_HIDAPI_RumbleRequest can only hold 64 bytes. 'volatile' is not meant for thread synchronization. The list of rumble request could grow infinitely if user call SDL_JoystickRumble too much. The documentation says "Each call to this function cancels any previous rumble effect", so overwriting pending request seem like a good idea.