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package semaphore
// Instance is an implementation of semaphore.
type Instance struct {
token chan struct{}
}
// New create a new Semaphore with n permits.
func New(n int) *Instance {
s := &Instance{
token: make(chan struct{}, n),
}
for i := 0; i < n; i++ {
s.token <- struct{}{}
}
return s
}
// Wait returns a channel for acquiring a permit.
func (s *Instance) Wait() <-chan struct{} {
return s.token
}
// Signal releases a permit into the semaphore.
func (s *Instance) Signal() {
s.token <- struct{}{}
}
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