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