// 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)
}

//sys	SetupComm(handle Handle, dwInQueue uint32, dwOutQueue uint32) (err error)
//sys	WaitCommEvent(handle Handle, lpEvtMask *uint32, lpOverlapped *Overlapped) (err error)
//sys	GetActiveProcessorCount(groupNumber uint16) (ret uint32)
//sys	GetMaximumProcessorCount(groupNumber uint16) (ret uint32)
//sys	EnumWindows(enumFunc uintptr, param unsafe.Pointer) (err error) = user32.EnumWindows

	procGetACP                                               = modkernel32.NewProc("GetACP")
	procGetActiveProcessorCount                              = modkernel32.NewProc("GetActiveProcessorCount")
	procGetCommModemStatus                                   = modkernel32.NewProc("GetCommModemStatus")
	procGetCommState                                         = modkernel32.NewProc("GetCommState")