runtime: implement resetTimer

src/runtime/time.go

@@ -13,6 +13,7 @@ func (t *timerNode) whenTicks() timeUnit {
 }
 
 // Defined in the time package, implemented here in the runtime.
+//
 //go:linkname startTimer time.startTimer
 func startTimer(tim *timer) {
 	addTimer(&timerNode{
@@ -48,3 +49,11 @@ func timerCallback(tn *timerNode) {
 func stopTimer(tim *timer) bool {
 	return removeTimer(tim)
 }
+
+//go:linkname resetTimer time.resetTimer
+func resetTimer(tim *timer, when int64) bool {
+	tim.when = when
+	removed := removeTimer(tim)
+	startTimer(tim)
+	return removed
+}