python学习之多线程(一)

引入线程包或者命名空间import threading

一：建立一个简单的线程程序

import time, threading

def test():
    print('thread %s is running...' % threading.current_thread().name)
    n = 0
    while n < 5:
        n = n + 1
        print('thread %s >>> %s' % (threading.current_thread().name, n))
        time.sleep(1)
    print('thread %s ended.' % threading.current_thread().name)

print('thread %s is running...' % threading.current_thread().name)
t = threading.Thread(target=test, name='test')
t.start()
t.join()
print('thread %s ended.' % threading.current_thread().name)

运行结果如下：

二：多个线程中线程同步

#-*- encoding: gb2312 -*-
import string, threading, time

def thread_main(a):
global count, mutex
# 获得线程名
threadname = threading.currentThread().getName()

for x in xrange(0, int(a)):
    # 取得锁
    mutex.acquire()
    count = count + 1
    # 释放锁
    mutex.release()
    print(threadname, x, count)
    time.sleep(1)

def main(num):
global count, mutex
threads = []

count = 1
# 创建一个锁
mutex = threading.Lock()
# 先创建线程对象
for x in xrange(0, num):
    threads.append(threading.Thread(target=thread_main, args=(10,)))
# 启动所有线程
for t in threads:
    t.start()
# 主线程中等待所有子线程退出
for t in threads:
    t.join()

if __name__ == '__main__':
num = 4
# 创建4个线程
main(4)