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v2fly/common/signal/done.go

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2018-02-08 09:39:46 -05:00
package signal
import (
"sync"
)
type Done struct {
access sync.Mutex
c chan struct{}
closed bool
}
func NewDone() *Done {
return &Done{
c: make(chan struct{}),
}
}
func (d *Done) Done() bool {
select {
case <-d.c:
return true
default:
return false
}
}
func (d *Done) C() chan struct{} {
return d.c
}
func (d *Done) Wait() {
<-d.c
}
func (d *Done) Close() error {
d.access.Lock()
defer d.access.Unlock()
if d.closed {
return nil
}
d.closed = true
close(d.c)
return nil
}