timer

问题 I'm trying to write a Javascript function that calls doSomething() continuously, as long as some_condition is true. If some_condition becomes false, it should check after five seconds whether some_condition has again become true, and if not, display an error message on the screen. I currently have this much of the function written, but am confused about whether I am doing this correctly. Thanks for the help. while (some_condition) { doSomething(); else { ??? } 回答1: No, you should not use a

问题 Background I have created a sample timer app that counts from a specific value down to zero. A label displays how much time is left. Every time the NSTimer (1s interval) calls countDownSecs() it prints how many seconds are left and executes println("countDownSecs()") . When the countdown has reached 0 seconds it sends a local push notification. When running in the simulator that works and even for like 5 minutes it stays in the background and continuously prints the seconds left and

问题 I have a timestamp stored in a MySQL database, and I want to periodically (say every second), update the difference between the current time and the timestamp value stored on the database (of course without reloading the page) to show something like a 5 minute count-down timer. Right now. I'm thinking use setTimeout to periodically fire an AJAX request that gets this value. Is this the best approach? Instead, should I just run a client-side timer, and then sync it with the server-side

问题 I have a Linux module which creates timers, some of which may add themselves again during their handler function. In some other cases, the timer is removed (perhaps before it's gone off) using del_timer_sync() . In that case, do I need to do the init_timer() call again on the struct before I next add_timer( ) or is that just a waste of (precious) interrupt latency? 回答1: To answer my own question, I believe I do need to init_timer() my struct after any del_timer() or del_timer_sync() if I ever

问题 Is it possible to invoke didUpdateLocations inside the Timer ? I mean.. _timer = Timer.scheduledTimer(timeInterval: 10, target: self, selector: #selector(_:didUpdateLocations:)), userInfo: nil, repeats: true) Is that going to work ? If yes then it is going to update location every 10 seconds ? 回答1: You can't invoke didUpdateLocations. If you want frequent updates, your best choice is the Standard location service: The standard location service is most appropriate for apps that deliver

问题 Is it possible to invoke didUpdateLocations inside the Timer ? I mean.. _timer = Timer.scheduledTimer(timeInterval: 10, target: self, selector: #selector(_:didUpdateLocations:)), userInfo: nil, repeats: true) Is that going to work ? If yes then it is going to update location every 10 seconds ? 回答1: You can't invoke didUpdateLocations. If you want frequent updates, your best choice is the Standard location service: The standard location service is most appropriate for apps that deliver

问题 Alright i am using System.Threading.Timer objects to regularly fire events Q1: As far as i understood it starts new tasks like Task.Factory.StartNew am i correct ? Here how i use example System.Threading.Timer object private static Timer _timer; _timer = new Timer(checkWaitingUrls, null, PublicSettings.irTimers_Delayed_Start_MiliSeconds, howManySeconds * 1000); Now i can handle unexpected errors at Task.Factory.StartNew like below Task myTask = Task.Factory.StartNew(() => { process_Given_Page

问题 I need to measure the time difference between when the last packet was received and the new one has arrived. I have tried using the Timer class in C# as such: while (listening) { if (hB != null) { interval = hB.GetHBInterval(); aTimer = new System.Timers.Timer(interval+5); Console.WriteLine("Interval is: {0}", interval); byte[] bytes = listener.Receive(ref groupEP); DecodeUDPMessage(Encoding.UTF8.GetString(bytes, 0, bytes.Length)); } else { byte[] bytes = listener.Receive(ref groupEP);

问题 So I've got two timers, one that increases the score and one that spawns enemies. I used a notification to invalidate the timers, and then I'm using another one to recreate the timers. When I quit and then open the app, there are two sets of enemies being spawned on top of each other. I think timerRecreate = true and also the regular timers in GameScene are also being called. GameViewController.swift file: class GameViewController: UIViewController { override func viewDidLoad() { super

问题 I have a timer with interval of 1000 ms. I want to do something at random time but within a given time frame. E.g. If I specify the time frame to be for example 10 seconds, 1-10, 11-20, 21-30 and so on. This means that in the first 10 seconds something will happen between the 1st time frame 1 to 10 seconds at random. E.g. could happen in the 2nd second or the 8th second. Then again from 11 to 20 seconds something occurs again any time between the second time frame. E.g. this could be the 13th