python多线程threading的使用

一、线程创建方法

1. 普通创建

import threading


def run(name):
    for i in range(3):
　　    print(name)

if __name__ == '__main__':
    t1 = threading.Thread(target=run, args=("t1",))
    t2 = threading.Thread(target=run, args=("t2",))
    t1.start()
    t2.start()

--------------------------------------------

t1
t2
t2
t1
t2
t1

2. 自定义线程类

import threading


class MyThread(threading.Thread):
    def __init__(self, name):
        super(MyThread, self).__init__()
        self.name = name

    def run(self):
        for i in range(3):
            print(self.name)


if __name__ == "__main__":
    t1 = MyThread("t1")
    t2 = MyThread("t2")
    t1.start()
    t2.start()

二、线程的使用

1.守护线程

子线程会随着主线程的结束而结束

t = threading.Thread(target=run, args=("t1",))
t.setDaemon(True) # 把子进程设置为守护线程，必须在start()之前设置
t.start()

2.主线程等待子线程结束

t = threading.Thread(target=run, args=("t1",))
t.setDaemon(True)
t.join() # 设置主线程等待子线程结束
t.start()

3.互斥锁

from threading import Thread,Lock


n = 10
def run():
    global n
    locker.acquire()
    n -= 1
    locker.release()

if __name__ == '__main__':
    locker = Lock()
    t1 = Thread(target=run)
    t2 = Thread(target=run)
    t1.start()
    t2.start()