python2.4前有个thread模块支持多线程编程,2.4后新增了threading模块,提供更高级别和更强大的线程支持.
- threading.activeCount():返回激活的线程对象的数量
- threading.currentThread():返回当前cpu执行的线程对象
- threading.enumerate(): 返回当前激活的线程对象列表
除此之外,threading提供了很多和java中Thread类一样的方法:(注意这是都是实例方法)
- run(): The run() method is the entry point for a thread.
- start(): The start() method starts a thread by calling the run method.
- join([time]): The join() waits for threads to terminate.
- isAlive(): The isAlive() method checks whether a thread is still executing.
- getName(): The getName() method returns the name of a thread.
- setName(): The setName() method sets the name of a thread.
创建线程的方式有两种:
1)继承threading.Thread
a.创建一个threading.Thread的子类
b.覆盖__init__(self [,args])
c.重写run方法
#!/usr/bin/python
#!coding=utf-8
import threading
import time
exitFlag = 0
class MyThread(threading.Thread):
def __init__(self, threadID, name, counter):
threading.Thread.__init__(self)
self.threadID = threadID
self.name = name
self.counter = counter
def run(self):
task()
def task(self):
'''线程要执行的任务'''
print 'starting ' + self.name
print 'exiting ' + self.name
#创建线程
thread1 = MyThread(1,'Thread-1', 1)
thread2 = MyThread(2,'Thread-2', 2)
#启动线程
thread1.start()
thread2.start()
#等待线程结束
thread1.join()
thread2.join()
print 'exiting main thread'
2)任务函数作为参数传递到Thread方法中
threading.Thread(target=task, args=()).start()
