errno := stdcall2(_NtCancelWaitCompletionPacket, mp.waitIocpHandle, 1)
	switch errno {
	case STATUS_CANCELLED:
		// STATUS_CANCELLED is returned when the associated timer has already expired,
		// in which automatically cancels the wait completion packet.
		fallthrough
	case STATUS_SUCCESS:
		dt := -delay / 100 // relative sleep (negative), 100ns units

import "unsafe"

const MaxArgs = maxArgs

var (
	OsYield                 = osyield
	TimeBeginPeriodRetValue = &timeBeginPeriodRetValue
)

func NumberOfProcessors() int32 {
	var info systeminfo
	stdcall1(_GetSystemInfo, uintptr(unsafe.Pointer(&info)))
	return int32(info.dwnumberofprocessors)
}

type ContextStub struct {
	context
}

func (c ContextStub) GetPC() uintptr {
	return c.ip()
}

_4args:
	MOVQ	24(SI), R9
	MOVQ	R9, X3
_3args:
	MOVQ	16(SI), R8
	MOVQ	R8, X2
_2args:
	MOVQ	8(SI), DX
	MOVQ	DX, X1
_1args:
	MOVQ	0(SI), CX
	MOVQ	CX, X0
_0args:

	// Call stdcall function.
	CALL	AX

	ADDQ	$(const_maxArgs*8), SP

	// Return result.
	MOVQ	0(SP), CX
	MOVQ	8(SP), SP
	MOVQ	AX, libcall_r1(CX)
	// Floating point return values are returned in XMM0. Setting r2 to this