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42 lines
607 B
Go
42 lines
607 B
Go
package utils
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type RefCount struct {
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_ NoCopy
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refCh chan bool
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notifyZero chan struct{}
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}
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func NewRefCounter() *RefCount {
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rc := &RefCount{
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refCh: make(chan bool, 1),
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notifyZero: make(chan struct{}),
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}
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go func() {
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refCount := uint32(1)
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for isAdd := range rc.refCh {
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if isAdd {
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refCount++
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} else {
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refCount--
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}
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if refCount <= 0 {
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close(rc.notifyZero)
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return
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}
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}
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}()
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return rc
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}
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func (rc *RefCount) Zero() <-chan struct{} {
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return rc.notifyZero
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}
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func (rc *RefCount) Add() {
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rc.refCh <- true
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}
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func (rc *RefCount) Sub() {
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rc.refCh <- false
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}
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