gp.schedlink = 0
	if q.tail != 0 {
		q.tail.ptr().schedlink.set(gp)
	} else {
		q.head.set(gp)
	}
	q.tail.set(gp)
}

// pushBackAll adds all Gs in q2 to the tail of q. After this q2 must
// not be used.
func (q *gQueue) pushBackAll(q2 gQueue) {
	if q2.tail == 0 {
		return
	}
	q2.tail.ptr().schedlink = 0
	if q.tail != 0 {
		q.tail.ptr().schedlink = q2.head
	} else {