Method addChild

pkg/util/tomb/context.go:53–69

(parent context.Context, child context.Context, cancel func())

}

func (t *Tomb) addChild(parent context.Context, child context.Context, cancel func()) {
	if t.reason != ErrStillAlive {
		cancel()
		return
	}
	if t.child == nil {
		t.child = make(map[interface{}]childContext)
	}
	t.child[parent] = childContext{child, cancel, child.Done()}
	for parent, child := range t.child {
		select {
		case <-child.done:
			delete(t.child, parent)
		default:
		}
	}
}