1 files changed, 65 insertions, 0 deletions
diff --git a/src/timer.go b/src/timer.go
new file mode 100644
index 0000000..3def253
--- /dev/null
+++ b/src/timer.go
@@ -0,0 +1,65 @@
+package main
+
+import (
+	"time"
+)
+
+type Timer struct {
+	pending AtomicBool
+	timer   *time.Timer
+}
+
+/* Starts the timer if not already pending
+ */
+func (t *Timer) Start(dur time.Duration) bool {
+	set := t.pending.Swap(true)
+	if !set {
+		t.timer.Reset(dur)
+		return true
+	}
+	return false
+}
+
+/* Stops the timer
+ */
+func (t *Timer) Stop() {
+	set := t.pending.Swap(true)
+	if set {
+		t.timer.Stop()
+		select {
+		case <-t.timer.C:
+		default:
+		}
+	}
+	t.pending.Set(false)
+}
+
+func (t *Timer) Pending() bool {
+	return t.pending.Get()
+}
+
+func (t *Timer) Reset(dur time.Duration) {
+	t.pending.Set(false)
+	t.Start(dur)
+}
+
+func (t *Timer) Push(dur time.Duration) {
+	if t.pending.Get() {
+		t.Reset(dur)
+	}
+}
+
+func (t *Timer) Wait() <-chan time.Time {
+	return t.timer.C
+}
+
+func NewTimer() (t Timer) {
+	t.pending.Set(false)
+	t.timer = time.NewTimer(0)
+	t.timer.Stop()
+	select {
+	case <-t.timer.C:
+	default:
+	}
+	return
+}