multitasking

问题 I am implementing a kind of tracking app and i need to spot my location once and send it once per 10 - 20 seconds (period value is important and can't be exceeded). To lower battery consumption i stop location updates. This works good in foreground, but how can i do it when app moved in background? I looked info about background fetch, but it hasn't got precise time for periodic sending data How can i perform this task? 回答1: You can start and Stop periodic location update while app is in

问题 What causes transition of process from one state to another state if non-preemptive multitasking scheme is being used to manage multiple tasks in the system? 回答1: Suppose a process is in running state. Now it moves to waiting state for I/O. In that case, another ready process will be context switched and will be executed. 来源： https://stackoverflow.com/questions/37501917/non-preemptive-multitasking-scheduling-algorithm

问题 Since preemptive multitasking is not available in a browser, and JavaScript is inherently single threaded, how does a Redux Middleware like redux-saga handle infinite loops not designed for cooperative multitasking without triggering the long-running script dialog? function* watchSaga() { while (true) { yield take(SOME_REQUEST); // do something } } Edit My statement "not designed for cooperative multitasking" was wrong. A generator function's code is executed only until the first yield

问题 I wrote method, which adds elements to the List from many sources. See below: public static async Task<List<SearchingItem>> GetItemsToSelect() { List<SearchingItem> searchingItems = new List<SearchingItem>(); foreach (Place place in await GetPlaces()) { searchingItems.Add(new SearchingItem() { IdFromRealModel=place.Id, NameToDisplay=place.FullName, ExtraInformation=place.Name, TypeOfSearchingItem=TypeOfSearchingItem.PLACE }); } foreach (Group group in await GetGroups()) { searchingItems.Add

问题 I'm writing a research application that takes advantage of a specific sensor that broadcasts data over UDP. There are various commercial apps that use this sensor and we are hoping to be able to run both our application and an existing application side by side. In the past (iOS 8 and below) we would run our application in the background to record data and a different application in the foreground. Unfortunately it appears only a single application was able to bind to the incoming UDP data

问题 I am looking for a way to have an iPhone application run in the background indefinitely. This app will not be using location services or VoIP, but instead be preforming a specific task (sorry but I cannot explicitly say what the task is). The task can be comparable to checking to see if a file exists and then sleeping for 1 second. For the purpose of this question, the task should be running forever. Any help would be appreciated. As far as I can tell from iPhone documentation what I am

问题 Would it be possible to use the audio controls in the multitasking tray for non-audio related tasks? (For example, putting the app icon there, or using the buttons to respond to something else?) Does this violate an HIG rules? 回答1: You can use beginReceivingRemoteControlEvents and -remoteControlReceivedWithEvent: if you were the last app playing audio, but doing anything non-standard will be a HIG violation. There was an app which used the volume control to take pictures, but as soon as this

问题 I'm wondering if it's possible to implement preemptive multitasking of native code within a single process in user space on Linux. (That is, externally pause some running native code, save the context, swap in a different context, and resume execution, all orchestrated by user space but using calls that may enter the kernel.) I was thinking this could be done using a signal handler for SIGALRM , and the *context() family but it turns out that the entire *context() family is async-signal

问题 I'm wondering if it's possible to implement preemptive multitasking of native code within a single process in user space on Linux. (That is, externally pause some running native code, save the context, swap in a different context, and resume execution, all orchestrated by user space but using calls that may enter the kernel.) I was thinking this could be done using a signal handler for SIGALRM , and the *context() family but it turns out that the entire *context() family is async-signal

问题 I know this is possible as Tapbots Pastebot does this. I am trying to grab the UIPasteboard when my iPhone app is running in the background and add it to a UITableView just as Pastebot does but I am also trying to shorten the link, if its a URL and copy that back to the UIPastboard so its ready for the user to paste anywhere. Now Pastebot apparently runs in the background by playing an audio file for 10 minutes. I have set up the NSNotificationCenter like so in the