> [Tremblay:worker:(1) 0.000000] [s4u_test/INFO] Turning off: Three callbacks should be triggered
> [0.000000] [s4u_test/INFO] First callback
> [0.000000] [s4u_test/INFO] Second callback
> [Tremblay:worker:(1) 0.000000] [s4u_test/INFO] Turning off: Three callbacks should be triggered
> [0.000000] [s4u_test/INFO] First callback
> [0.000000] [s4u_test/INFO] Second callback