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