// solution in hcsshim: https://github.com/microsoft/hcsshim/blob/master/internal/processorinfo/processor_count.go
func ProcessorCount() int {
	if amount := getActiveProcessorCount(allProcessorGroups); amount != 0 {
		return int(amount)
	}
	return runtime.NumCPU()
}

func getActiveProcessorCount(groupNumber uint16) int {
	r0, _, _ := syscall.Syscall(procGetActiveProcessorCount.Addr(), 1, uintptr(groupNumber), 0, 0)
	return int(r0)
}