1.fix start task twice issue

toolbox/task.go

@@ -389,11 +389,16 @@ func dayMatches(s *Schedule, t time.Time) bool {
 
 // StartTask start all tasks
 func StartTask() {
+    if isstart {
+        //If already started， no need to start another goroutine.
+        return
+    }
 	isstart = true
 	go run()
 }
 
 func run() {
+
 	now := time.Now().Local()
 	for _, t := range AdminTaskList {
 		t.SetNext(now)
@@ -432,10 +437,13 @@ func run() {
 
 // StopTask stop all tasks
 func StopTask() {
+    if(isstart){
         isstart = false
         stop <- true
     }
 
+}
+
 // AddTask add task with name
 func AddTask(taskname string, t Tasker) {
 	AdminTaskList[taskname] = t