python 多线程

来源：互联网发布：遗传算法理解编辑：程序博客网时间：2024/05/22 05:04
一个python 多线程的例子
#coding=utf-8#!/usr/bin/pythonimport threadingimport timeimport libvirtclass mig_thread (threading.Thread):   #继承父类threading.Thread        def __init__(self, domain, conn):        threading.Thread.__init__(self)        self.domain = domain        self.conn = conn            def run(self):                   #把要执行的代码写到run函数里面 线程在创建后会直接运行run函数         #set maximum bandwidth (in MiB/s)        print self.domain.migrateSetMaxSpeed(30,0)     #设置最大迁移速度        print self.domain.migrateGetMaxSpeed(0)        #获取最大迁移速度         start1 = time.time()        self.domain.migrate(self.conn,9,'q_new',None,0)        end1 = time.time()        #get migrate time         print "-----------------------"        print "migrate time: %s " % str(end1-start1)        print "-----------------------"class set_thread(threading.Thread):        def __init__(self,domain):        threading.Thread.__init__(self)        self.domain = domain            def run(self):        self.domain.migrateSetMaxDowntime(20,0)    #设置最长停机时间        print "set downtime end"conn_004 = libvirt.open('qemu+tcp://qn@server004/system')   #创建一个连接conn_005 = libvirt.open('qemu+tcp://qn@server005/system')  vm_domain = conn_004.lookupByName('q_new')      #查找虚拟机# 创建新线程thread1 = mig_thread(vm_domain,conn_005)thread2 = set_thread(vm_domain)# 开启线程,确保thread1先执行thread1.start()time.sleep(2)thread2.start()print "Exiting Main Thread"
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