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@valyala @xuecai
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package fasthttp
import (
func initTimer(t *time.Timer, timeout time.Duration) *time.Timer {
if t == nil {
return time.NewTimer(timeout)
if t.Reset(timeout) {
panic("BUG: active timer trapped into initTimer()")
return t
func stopTimer(t *time.Timer) {
if !t.Stop() {
// Collect possibly added time from the channel
// if timer has been stopped and nobody collected its' value.
select {
case <-t.C:
// AcquireTimer returns a time.Timer from the pool and updates it to
// send the current time on its channel after at least timeout.
// The returned Timer may be returned to the pool with ReleaseTimer
// when no longer needed. This allows reducing GC load.
func AcquireTimer(timeout time.Duration) *time.Timer {
v := timerPool.Get()
if v == nil {
return time.NewTimer(timeout)
t := v.(*time.Timer)
initTimer(t, timeout)
return t
// ReleaseTimer returns the time.Timer acquired via AcquireTimer to the pool
// and prevents the Timer from firing.
// Do not access the released time.Timer or read from it's channel otherwise
// data races may occur.
func ReleaseTimer(t *time.Timer) {
var timerPool sync.Pool
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