| // Copyright 2017 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| package mysync | |
| import "runtime" | |
| type WaitGroup struct { | |
| Callers []uintptr | |
| } | |
| func (wg *WaitGroup) Add(x int) { | |
| wg.Callers = make([]uintptr, 32) | |
| n := runtime.Callers(1, wg.Callers) | |
| wg.Callers = wg.Callers[:n] | |
| } | |
| func (wg *WaitGroup) Done() { | |
| wg.Add(-1) | |
| } |