background-process | 易学教程

Asynchronous background processes in Python?

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问题 I have been using this as a reference, but not able to accomplish exactly what I need: Calling an external command in Python I also was reading this: http://www.python.org/dev/peps/pep-3145/ For our project, we have 5 svn checkouts that need to update before we can deploy our application. In my dev environment, where speedy deployments are a bit more important for productivity than a production deployment, I have been working on speeding up the process. I have a bash script that has been

run a shell script and immediately background it, however keep the ability to inspect its output

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问题 How can I run a shell script and immediately background it, however keep the ability to inspect its output any time by tailing /tmp/output.txt It would be nice if I can foreground the process too later. PS It would be really cool if you can also show me how to "send" the backgrounded process in to a gnu screen that may or may not have been initialized. 回答1: To 'background' a process when you start it Simply add an ampersand ( & ) after the command. If the program writes to standard out, it

Run a php script as a background process in wamp server

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问题 I have two php scripts that need to be run as continuous back ground processes in WAMP server. Wamp server is installed in window 7 PC. These scripts are already reside in separate folder in the www root directory. Apache Version :2.2.8 PHP Version :5.2.6 Since this is not a unix platform I can't use nohup php script.php > /dev/null & command to do this job. I'm looking for similar kind of command or method which works in wamp server windows platform. Can anyone explain the steps I need to be

How to run cordova plugins in the background?

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问题 Im making an application based on phonegap (cordova). I have tested it some times, and lately I saw a message in xcode that said "Plugin should use a background thread." So is it possible to make cordova plugins run in the background of the app? if so, please tell how. Thanks! 回答1: A background thread isn't the same that executing code while the app is in background, a background thread is used to don't block the UI while you execute a long task. Example of background thread on iOS - (void

Spawn a background process in Ruby

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I'm writing a ruby bootstrapping script for a school project, and part of this bootstrapping process is to start a couple of background processes (which are written and function properly). What I'd like to do is something along the lines of: `/path/to/daemon1 &` `/path/to/daemon2 &` `/path/to/daemon3 &` However, that blocks on the first call to execute daemon1. I've seen references to a Process.spawn method, but that seems to be a 1.9+ feature, and I'm limited to Ruby 1.8. I've also tried to execute these daemons from different threads, but I'd like my bootstrap script to be able to exit. So

How To Properly Update A Widget In Android 8.0 - Oreo - API 26

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问题 Let's say I have a widget for an app that has targetSDKVersion set to 26. This widget takes between 100ms and 10s to update. Most of the time under 1s. Before Android O, if onUpdate() was called on my AppWidgetProvider, I could launch a background service to update this widget. However, Android O returns an IllegalStateException if you attempt that behavior. The obvious solution of starting a foreground service seems like an extreme measure for something that will be done in under 10s 99% of

Ruby on Rails: How to run things in the background?

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问题 When a new resource is created and it needs to do some lengthy processing before the resource is ready, how do I send that processing away into the background where it won't hold up the current request or other traffic to my web-app? in my model: class User < ActiveRecord::Base after_save :background_check protected def background_check # check through a list of 10000000000001 mil different # databases that takes approx one hour :) if( check_for_record_in_www( self.username ) ) # code that is

iOS Voip Socket will not run in background

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I am getting a VOIP socket to run in the background in an iOS application. My connection works fine, but it won't wake up when my app goes into the background. If I open the app back up, though, it responds to any messages it got while it was asleep. I set up my stream like this: CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, (CFStringRef) @"test.iusealocaltestserver.com", 5060, &myReadStream, &myWriteStream); CFReadStreamSetProperty ( myReadStream, kCFStreamNetworkServiceType, kCFStreamNetworkServiceTypeVoIP ); CFSocketNativeHandle native; CFDataRef nativeProp =

How to use beginBackgroundTaskWithExpirationHandler for already running task in iOS

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In my app, I am uploading images to server from iPhone. While sync if user press home button, App will close. I want app must be running in background till sync finish. My question is: How can I add currently running task with " beginBackgroundTaskWithExpirationHandler "? Please share your ideas. Despite its name, beginBackgroundTaskWithExpirationHandler: does not actually "begin" a task. It might be better thought of as "register..." rather than "begin...." You're just telling the system that you're in the middle of doing something that would like to complete if that's ok. Several points: In

How to execute background task when Android app is closed / set to background?

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问题 My Android 4+ app is connected to a custom web service that is used to sync data every few minutes. To make sure, that the online data is always up to date, I want to trigger the sync when ever the app is closed / send to background. Under iOS this is quite easy: Listen to applicationDidEnterBackground: in the AppDelegate Use beginBackgroundTaskWithName: to start you long running background task and to avoid being suspended while the task is still running How to do this on Android? First