init

dtask/safetimer.go

@@ -0,0 +1,33 @@
+package dtask
+
+import "time"
+
+/*
+This code is based on the following resources:
+source code:	https://play.golang.org/p/Ys9qqanqmU
+discuss:	https://groups.google.com/forum/#!msg/golang-dev/c9UUfASVPoU/tlbK2BpFEwAJ
+*/
+type safetimer struct {
+	*time.Timer
+	scr bool
+}
+
+//saw channel read, must be called after receiving value from safetimer chan
+func (t *safetimer) SCR() {
+	t.scr = true
+}
+
+func (t *safetimer) SafeReset(d time.Duration) bool {
+	ret := t.Stop()
+	if !ret && !t.scr {
+		<-t.C
+	}
+	t.Timer.Reset(d)
+	t.scr = false
+	return ret
+}
+func newSafeTimer(d time.Duration) *safetimer {
+	return &safetimer{
+		Timer: time.NewTimer(d),
+	}
+}