Python--线程

# -*- coding: utf-8 -*-

# @Time    : 2018/1/2 0002 13:36

# @Author  : wangyafeng

# @Email   : 279949848@qq.com

 

###################threading###########################

import threading,time

 

def loop():

    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)

 

 

def loop2():

    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)

 

 

threads = []

t1 = threading.Thread(target=loop, name='LoopThread')

threads.append(t1)

t2 = threading.Thread(target=loop, name='wyf')

threads.append(t2)

 

if __name__ == '__main__':

    for t in threads:

        t.setDaemon(True) #守护线程

        t.start()   #线程开始

    t.join()        #等待主进程：在子线程完成运行之前，这个子线程的父线程将一直被阻塞

    print("all over")

 #----------------------------运行结果------------------------------------------------------

 

D:\Python\Python36-32\python.exe D:/PycharmProjects/python实例/菜鸟升级/多线程.py

thread LoopThread is running...

thread LoopThread >>> 1

thread wyf is running...

thread wyf >>> 1

thread wyf >>> 2

thread LoopThread >>> 2

thread LoopThread >>> 3

thread wyf >>> 3

thread wyf >>> 4

thread LoopThread >>> 4

thread LoopThread >>> 5

thread wyf >>> 5

thread wyf ended.

all over

 

Process finished with exit code 0

 

###################Lock#################################

当把代码改为如下时：

def loop():

    print('thread %s is running...' % threading.current_thread().name)

 

    n = 0

    try:

        lock.acquire()

        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)

    finally:

        lock.release()

 

 

def loop2():

    n = 0

    try:

        lock.acquire()

        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)

    finally:

        lock.release()

 #----------------------------------------------------------------------执行结果如下

 

 

 

D:\Python\Python36-32\python.exe D:/PycharmProjects/python实例/菜鸟升级/多线程.py

 

thread LoopThread is running...

thread LoopThread >>> 1

thread wyf is running...

thread LoopThread >>> 2

thread LoopThread >>> 3

thread LoopThread >>> 4

thread LoopThread >>> 5

thread LoopThread ended.

thread wyf >>> 1

thread wyf >>> 2

thread wyf >>> 3

thread wyf >>> 4

thread wyf >>> 5

thread wyf ended.

all over

 #so，这还是我们想要的结果.....................为了好看，有些代码不太规整，将就着看吧.................................................................

 

 

import threading,time

 

 

# 创建全局ThreadLocal对象:

local_school = threading.local()

 

 

def process_student():

    # 获取当前线程关联的student:

    std = local_school.student

    print('Hello, %s (in %s)' % (std, threading.current_thread().name))

 

 

def process_thread(name):

    # 绑定ThreadLocal的student:

    local_school.student = name

    for i in range(2):

        print("i=",i)

        time.sleep(1)

        process_student()

 

 

t1 = threading.Thread(target= process_thread, args=('Alice',), name='Thread-A')

t2 = threading.Thread(target= process_thread, args=('Bob',), name='Thread-B')

t3 = threading.Thread(target= process_thread, args=('owen',), name='Thread-C')

 

t2.start();  t2.join();

t1.start();  t1.join();

t3.start();  t3.join();

 

#__________________运行结果_________________________________________

 

 

D:\Python\Python36-32\python.exe D:/PycharmProjects/python实例/菜鸟升级/多线程.py

 

i= 0

Hello, Bob (in Thread-B)

i= 1

Hello, Bob (in Thread-B)

i= 0

Hello, Alice (in Thread-A)

i= 1

Hello, Alice (in Thread-A)

i= 0

Hello, owen (in Thread-C)

i= 1

Hello, owen (in Thread-C)

 

Process finished with exit code 0

 

 #？？？？？？？？？？？？？？？？？？？？？？？？？？？？未完待续........