Python中的实时中断 [英] Real-time interrupts in Python

问题描述

我有一个运行无限while循环的Python 2.7程序，我想合并一个计时器中断. 我的目的是在循环中的某个时刻触发一个计时器，当5秒钟过去后，我希望代码跳转到while循环的特定部分.

I have a Python 2.7 program running an infinite while loop and I want to incorporate a timer interrupt. What I aim to do is to set off a timer at some point in the loop, and when 5 seconds have elapsed I want the code to branch to a specific part of the while loop.

到目前为止，我一直在做以下事情: 在while循环的每次迭代中，我都在检查使用代码到达该点时经过了多少时间

What I have been doing so far is the following: in each iteration of the while loop I am checking how much time has elapsed when I reach that point in the code using

time.clock()

如果差异超过5，我将运行我打算运行的代码块

and if the difference exceeds 5 I run the chunk of code I mean to run

但是，在我评估时间之前可能要经过7秒，这将是> 5秒，但我想在5秒过去后准确地到达该地点

However that way 7 seconds might pass before I evaluate the time, it will be >5sec but I want to go there exactly when 5 seconds pass

此外，我需要为1个以上的计数器(可能最多为100个)工作，但我不希望中断彼此中断.使用Timer也不起作用.

Also, I need this to work for more than 1 counter (possibly up to a 100) but I do not want the interrupts to interrupt each other. Using Timer did not work either.

我知道这可以通过在汇编中使用计时器中断来完成，但是我该如何在python中做到这一点呢?

I know this can be done using timer interrupts in assembly but how can I do that in python?

推荐答案

如果要处理单个事件，则最简单的方法是使用signal框架，该框架是

If a single event is to be handled, then the easiest way is to use the signal framework which is a standard module of Python.

但是，如果我们需要一个成熟的调度程序，那么我们就不得不求助于另一个模块:sched. 此处是官方文档的指针.但是请注意，在多线程环境中，sched 在线程安全性方面有局限性.

However, if we need a fully-fledged scheduler, then we have to resort to another module: sched. Here is a pointer to the official documentation. Please be aware, though, that in multi-threaded environments sched has limitations with respect to thread-safety.

另一个选项是高级Python计划程序，它不属于标准发行版.

Another option is the Advanced Python Scheduler, which is not part of the standard distribution.

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