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v2fly/common/signal/semaphore.go
2018-02-08 15:39:46 +01:00

24 lines
342 B
Go

package signal
type Semaphore struct {
token chan struct{}
}
func NewSemaphore(n int) *Semaphore {
s := &Semaphore{
token: make(chan struct{}, n),
}
for i := 0; i < n; i++ {
s.token <- struct{}{}
}
return s
}
func (s *Semaphore) Wait() <-chan struct{} {
return s.token
}
func (s *Semaphore) Signal() {
s.token <- struct{}{}
}