mirror of
https://github.com/tickstep/aliyunpan.git
synced 2025-01-23 14:32:14 +08:00
71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
// Copyright (c) 2020 tickstep.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
package waitgroup
|
|
|
|
import "sync"
|
|
|
|
// WaitGroup 在 sync.WaitGroup 的基础上, 新增线程控制功能
|
|
type WaitGroup struct {
|
|
wg sync.WaitGroup
|
|
p chan struct{}
|
|
|
|
sync.RWMutex
|
|
}
|
|
|
|
// NewWaitGroup returns a pointer to a new `WaitGroup` object.
|
|
// parallel 为最大并发数, 0 代表无限制
|
|
func NewWaitGroup(parallel int) (w *WaitGroup) {
|
|
w = &WaitGroup{
|
|
wg: sync.WaitGroup{},
|
|
}
|
|
|
|
if parallel <= 0 {
|
|
return
|
|
}
|
|
|
|
w.p = make(chan struct{}, parallel)
|
|
return
|
|
}
|
|
|
|
// AddDelta sync.WaitGroup.Add(1)
|
|
func (w *WaitGroup) AddDelta() {
|
|
if w.p != nil {
|
|
w.p <- struct{}{}
|
|
}
|
|
|
|
w.wg.Add(1)
|
|
}
|
|
|
|
// Done sync.WaitGroup.Done()
|
|
func (w *WaitGroup) Done() {
|
|
w.wg.Done()
|
|
|
|
if w.p != nil {
|
|
<-w.p
|
|
}
|
|
}
|
|
|
|
// Wait 参照 sync.WaitGroup 的 Wait 方法
|
|
func (w *WaitGroup) Wait() {
|
|
w.wg.Wait()
|
|
if w.p != nil {
|
|
close(w.p)
|
|
}
|
|
}
|
|
|
|
// Parallel 返回当前正在进行的任务数量
|
|
func (w *WaitGroup) Parallel() int {
|
|
return len(w.p)
|
|
}
|