python中的线程:使用target =时检索返回值 [英] Threading in python: retrieve return value when using target=

问题描述

可能重复:
从线程返回值

Possible Duplicate:
Return value from thread

我想获得像这样的一堆服务器的空闲内存":

I want to get the "free memory" of a bunch of servers like this:

def get_mem(servername):  
    res = os.popen('ssh %s "grep MemFree /proc/meminfo | sed \'s/[^0-9]//g\'"' % servername)  
    return res.read().strip()  

由于可以线程化，所以我想做类似的事情:

since this can be threaded I want to do something like that:

import threading  
thread1 = threading.Thread(target=get_mem, args=("server01", ))  
thread1.start()

但是现在:如何访问get_mem函数的返回值? 我真的需要采取完整的方法来创建class MemThread(threading.Thread)并覆盖__init__和__run__吗?

But now: how can I access the return value(s) of the get_mem functions? Do I really need to go the full fledged way creating a class MemThread(threading.Thread) and overwriting __init__ and __run__?

推荐答案

您可以创建同步的队列，将其传递给线程函数，并通过将结果推送到队列来使其返回报告，例如:

You could create a synchronised queue, pass it to the thread function and have it report back by pushing the result into the queue, e.g.:

def get_mem(servername, q):
    res = os.popen('ssh %s "grep MemFree /proc/meminfo | sed \'s/[^0-9]//g\'"' % servername)
    q.put(res.read().strip())

# ...

import threading, queue
q = queue.Queue()
threading.Thread(target=get_mem, args=("server01", q)).start()
result = q.get()

这篇关于python中的线程:使用target =时检索返回值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！