多线程实现ping扫描

代码:

# coding=utf-8
import subprocess
from Queue import Queue
import threading

class Pinger(object):

    def __init__(self, ip_list, thread_num=2):
        self._ip_list = ip_list
        self._thread_num = thread_num
        self._queue = Queue(len(ip_list))

    def ping(self, thread_id):
        while True:
            if self._queue.empty():
                break
            addr = self._queue.get()
            print 'Thread %s: Ping %s' % (thread_id, addr)
            ret = subprocess.call('ping -c 1 %s' % (addr),
                                  shell=True,
                                  stdout=open("/dev/null", 'w'),
                                  stderr=subprocess.STDOUT)
            if ret == 0:
                print '%s: is still alive' % addr
            else:
                print '%s: did not respond ' % addr
            self._queue.task_done() #unfinished tasks -= 1

    def run(self):
        for ip in ip_list:
            self._queue.put(ip)  #unfinished_tasks += 1
        print '---------------------task begin------------------'
        for i in range(self._thread_num):
            thrd = threading.Thread(target=self.ping, args=(i + 1,))
            #thrd.setDaemon(True)
            thrd.start()
        self._queue.join()  # 主线程一直阻塞，一直等到Queue.unfiinshed_tasks == 0
        print '---------------------task done-------------------'