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