是否可以修改子流程?

问题描述

我知道 os.nice() 它非常适合父进程，但我需要对我的子子进程进行修改.我找到了这样做的方法，但它似乎不是很方便而且过于过度:

I know about os.nice() it works perfect for parent process, but I need to do renice of my child subprocesses. I found way to do this, but it seems to be not very handy and too excessive:

os.system("renice -n %d %d" % ( new_nice, suprocess.pid ) )

并且它不是在重新调整后返回结果良好的水平.

And it isn't return resulting nice level after renicing.

有没有更简洁的方式来在 python 中修改子进程?

Is there more clean way to renice subprocesses in python?

推荐答案

使用 subprocess.Popen:

如果 preexec_fn 设置为可调用对象，则该对象将在子进程执行之前在子进程中被调用.(仅限 Unix)

If preexec_fn is set to a callable object, this object will be called in the child process just before the child is executed. (Unix only)

例子:

>>> Popen(["nice"]).communicate()
0
(None, None)
>>> Popen(["nice"], preexec_fn=lambda : os.nice(10)).communicate()
10
(None, None)
>>> Popen(["nice"], preexec_fn=lambda : os.nice(20)).communicate()
19
(None, None)

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