if mp.profileTimerValid.Load() {
		timerid := mp.profileTimer
		mp.profileTimerValid.Store(false)
		mp.profileTimer = 0

		ret := timer_delete(timerid)
		if ret != 0 {
			print("runtime: failed to disable profiling timer; timer_delete(", timerid, ") errno=", -ret, "\n")
			throw("timer_delete")
		}
	}

	if hz == 0 {
		// If the goal was to disable profiling for this thread, then the job's done.
		return
	}