python中的多线程 [英] Multi-Threading in python

问题描述

我的python代码是这样的：



def a（）：

...

...

subprocess.call（）

...

...



def b（）：

...

...



等等。



我的任务：

1）如果subprocess.call（）在3秒内返回，我的执行应该继续subprocess.call （）返回。

2）如果subprocess.call（）在3秒内没有返回，则应该终止subprocess.call（）并在3秒后继续执行。

3）在subprocess.call（）返回或3秒结束之前，不应该进行进一步的执行。



这可以通过线程完成但是如何完成？





真实代码的相关部分如下：



...

my python code goes like this:

def a():
...
...
subprocess.call()
...
...

def b():
...
...

and so on.

My task:
1) If subprocess.call() returns within 3 seconds, my execution should continue the moment subprocess.call() returns.
2) If subprocess.call() does not return within 3 seconds, the subprocess.call() should be terminated and my execution should continue after 3 seconds.
3) Until subprocess.call() returns or 3 seconds finishes, the further execution should not take place.

This can be done with threads but how?


Relevant part of the real code goes like this:

...

cmd = ["gcc", srcname, "-o", execname];
p = subprocess.Popen(cmd,stderr=errfile)#compiling C program

...

...

...
...

inputfile=open(input,'w')
inputfile.write(scanf_elements)
inputfile.close()
inputfile=open(input,'r')
tempfile=open(temp,'w')
                     subprocess.call(["./"+execname,str(commandline_argument)],stdin=inputfile,stdout=tempfile);#executing C program
tempfile.close();

...

...



我正在尝试使用python编译和执行C程序。

当我使用subprocess.call（）执行C程序并假设C程序包含无限循环时，则子进程s.call（）应该在3秒后终止，程序应该继续。我应该能够知道subprocess.call（）是否被强制终止或成功执行，以便我可以在下面的代码中打印消息。

...
...

I am trying to compile and execute a C program using python.
When I am executing C program using subprocess.call() and suppose if the C program contains an infinite loop, then the subprocess.call() should be terminated after 3 seconds and the program should continue. I should be able to know whether the subprocess.call() was forcefully terminated or successfully executed so that I can accordingly print the message in the following code.

推荐答案

实现主线程中的某种形式的计时器，用于检查呼叫是否已返回。请参阅 https://docs.python.org/3.3/library/threading.html#module-threading [ ^ ] ，了解更多信息。

Implement some form of timer in your main thread to check whether the call has returned. See https://docs.python.org/3.3/library/threading.html#module-threading[^], for more information.

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