工人线程iOS [英] Worker Thread iOS

问题描述

我想在iPhone上创建一个后台线程，每10毫秒执行一些代码。
但是在我迷失并发编程指南和苹果的线程编程指南之前，我想问一下这里有人可以帮助我。
我想做什么：

I want to create a background thread on the iPhone that executes some code every 10msec. But before I get lost in the concurrency programming guide and the threading programming guide of apple again, I wanted to ask whether someone here can help me out. What I want to do:

• 创建后台工作线程


• 触发每10毫秒执行一次方法。 （可能是通过在该线程中使用NSTimer？）


• 尽量减少主应用程序线程的负载

在我的理解中，继承 NSThread 并在该子类中编写我自己的main方法应该可以解决问题。这样我就不会使用 NSTimer 来获取更新间隔，例如：

In my understanding subclassing NSThread and writing my own main method in that subclass should do the trick. That way I don't use an NSTimer for the update intervals but something like:

[NSThread sleepForTimeInterval: 0.01];

主线程和工作线程之间的排队机制也没有任何意义，因为工作线程应该反复执行相同的操作 - 直到停止。

Also queuing mechanisms between main thread and worker thread don't make any sense, as the worker thread should perform the same operation over and over - until stopped.

问题是：如何配置线程使用计时器？我看不出如何将 NSTimer 附加到该工作线程Run Loop？

The question is: How can I configure the thread to use a timer? I can't see how I can attach a NSTimer to that worker threads Run Loop?

推荐答案

使用你概述的方法可以做到这一点，但是你看过使用Grand Central Dispatch吗？它可以使其中的一些变得更容易：

It's possible to do this using the method you outline, but have you looked at using Grand Central Dispatch? It can make some of this a lot easier:

dispatch_queue_t backgroundQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(backgroundQueue, ^{
    while ([self shouldKeepProcessingInBackground]) {
        [self doBackgroundWork];
        usleep(1e4);
    }
})

您还可以使用定时器调度源定期工作：

You can also use a timer dispatch source to do work periodically:

dispatch_queue_t backgroundQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t timerSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, backgroundQueue);
dispatch_source_set_timer(timerSource, dispatch_time(DISPATCH_TIME_NOW, 0), 0.01*NSEC_PER_SEC, 0*NSEC_PER_SEC);
dispatch_source_set_event_handler(timerSource, ^{
    [self doBackgroundWork];
});
dispatch_resume(timerSource);

这篇关于工人线程iOS的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！