python 多線程之thread

python 多線程之thread

#! /usr/bin/env python# -*- coding:utf-8 -*-from threading import Threadimport subprocessfrom Queue import Queuenum_threads = 3ips = ['10.108.100.174', '119.75.218.77', '127.0.0.1']q = Queue()def pingit(i, queue):    while True:        ip = queue.get()        print "thread %s is pinging %s" % (i, ip)        ret = subprocess.call('ping -c 3 %s' % ip, shell=True, stdout=open('/dev/null','w'))#正常則返回0，異常則返回1；stdout=open('/dev/null','w')屏蔽ping具體細節資訊        if ret != 0:            print "%s is down" % ip        queue.task_done()for i in xrange(num_threads):#xrang比range好    t = Thread(target=pingit, args=(i, q))    t.setDaemon(True)#設定了setDaemon則線程會隨著主線程關閉而關閉，python中，主線程結束後，會預設等待子線程結束後，主線程才退出    t.start()for ip in ips:    q.put(ip)print "main thread is waiting..."q.join()print "Done..."

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