// Check the stack is initially empty.
	if LFStackPop(stack) != nil {
		t.Fatalf("stack is not empty")
	}

	// Push one element.
	node := allocMyNode(42)
	LFStackPush(stack, fromMyNode(node))

	// Push another.
	node = allocMyNode(43)
	LFStackPush(stack, fromMyNode(node))

	// Pop one element.
	node = toMyNode(LFStackPop(stack))
	if node == nil {
		t.Fatalf("stack is empty")
	}
	if node.data != 43 {

func (l LockRank) String() string {
	return lockRank(l).String()
}

const PreemptMSupported = preemptMSupported

type LFNode struct {
	Next    uint64
	Pushcnt uintptr
}

func LFStackPush(head *uint64, node *LFNode) {
	(*lfstack)(head).push((*lfnode)(unsafe.Pointer(node)))
}

func LFStackPop(head *uint64) *LFNode {
	return (*LFNode)((*lfstack)(head).pop())
}
func LFNodeValidate(node *LFNode) {