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|
package main
import (
"sync/atomic"
"time"
)
type Event struct {
guard int32
next time.Time
interval time.Duration
C chan struct{}
}
func newEvent(interval time.Duration) *Event {
return &Event{
guard: 0,
next: time.Now(),
interval: interval,
C: make(chan struct{}, 1),
}
}
func (e *Event) Clear() {
select {
case <-e.C:
default:
}
}
func (e *Event) Fire() {
if atomic.SwapInt32(&e.guard, 1) != 0 {
return
}
if now := time.Now(); now.After(e.next) {
select {
case e.C <- struct{}{}:
default:
}
e.next = now.Add(e.interval)
}
atomic.StoreInt32(&e.guard, 0)
}
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