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56 lines
1.0 KiB
Go
56 lines
1.0 KiB
Go
2 years ago
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package starmap
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import (
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"sync"
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"sync/atomic"
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"time"
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)
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type WaitGroup struct {
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wg *sync.WaitGroup
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maxCount uint32
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allCount uint32
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}
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func NewWaitGroup(maxCount int) WaitGroup {
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return WaitGroup{wg: &sync.WaitGroup{}, maxCount: uint32(maxCount)}
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}
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func (swg *WaitGroup) Add(delta int) {
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var Udelta uint32
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if delta < 0 {
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Udelta = uint32(-delta - 1)
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} else {
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Udelta = uint32(delta)
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}
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for {
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allC := atomic.LoadUint32(&swg.allCount)
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if atomic.LoadUint32(&swg.maxCount) == 0 || atomic.LoadUint32(&swg.maxCount) >= allC+uint32(delta) {
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if delta < 0 {
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atomic.AddUint32(&swg.allCount, ^uint32(Udelta))
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} else {
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atomic.AddUint32(&swg.allCount, uint32(Udelta))
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}
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break
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}
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time.Sleep(time.Microsecond)
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}
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swg.wg.Add(delta)
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}
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func (swg *WaitGroup) Done() {
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swg.Add(-1)
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}
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func (swg *WaitGroup) Wait() {
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swg.wg.Wait()
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}
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func (swg *WaitGroup) GetMaxWaitNum() int {
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return int(atomic.LoadUint32(&swg.maxCount))
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}
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func (swg *WaitGroup) SetMaxWaitNum(num int) {
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atomic.AddUint32(&swg.maxCount, uint32(num))
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}
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