if *runtime.TimeBeginPeriodRetValue != TIMERR_NOERROR {
		t.Fatalf("timeBeginPeriod failed: it returned %d", *runtime.TimeBeginPeriodRetValue)
	}
}

// removeOneCPU removes one (any) cpu from affinity mask.
// It returns new affinity mask.
func removeOneCPU(mask uintptr) (uintptr, error) {
	if mask == 0 {
		return 0, fmt.Errorf("cpu affinity mask is empty")
	}
	maskbits := int(unsafe.Sizeof(mask) * 8)