.

vendor/github.com/valyala/fasthttp/timer.go

@@ -0,0 +1,55 @@
+package fasthttp
+
+import (
+	"sync"
+	"time"
+)
+
+func initTimer(t *time.Timer, timeout time.Duration) *time.Timer {
+	if t == nil {
+		return time.NewTimer(timeout)
+	}
+	if t.Reset(timeout) {
+		// developer sanity-check
+		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:
+		default:
+		}
+	}
+}
+
+// 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 its channel otherwise
+// data races may occur.
+func ReleaseTimer(t *time.Timer) {
+	stopTimer(t)
+	timerPool.Put(t)
+}
+
+var timerPool sync.Pool