python進階筆記 thread 和 threading模組學習，pythonthreading

python進階筆記 thread 和 threading模組學習，pythonthreading

Python通過兩個標準庫thread和threading提供對線程的支援。
thread提供了低層級的、原始的線程以及一個簡單的鎖。
threading基於Java的執行緒模式設計。
鎖（Lock）和條件變數（Condition）在Java中是對象的基本行為（每一個對象都內建了鎖和條件變數），而在Python中則是獨立的對象。
start_new_thread()要求一定要有前兩個參數。所以，就算我們想要啟動並執行函數不要參數，我們也要傳一個空的元組。

test_thread.py

#! /usr/bin/env python
# -*- coding:utf-8 -*-
import thread
import time
from time import sleep,ctime

test_list = [5,8]
def f1():
    print 'start f1 at:',ctime()
    sleep(5)
    print 'f1 done at:',ctime()
def f2():
    print 'start f1 at:',ctime()
    sleep(3)
    print 'f1 done at:',ctime()
def main():
    print "start:",ctime()
    thread.start_new_thread(f1,())
    thread.start_new_thread(f2,())
    sleep(6)
    print "all end:",ctime()
if __name__ == '__main__':
    main()

test_threading.py

#! /usr/bin/env python
# -*- coding:utf-8 -*-
import threading
import time

exitFlag = 0

class myThread(threading.Thread):
    def __init__(self,threadID,name,delay):
        threading.Thread.__init__(self)
        self.threadID = threadID
        self.name = name
        self.delay = delay
    def run(self):
        print "Starting" + self.name
        print_time(self.name,self.delay,5)
        print "Exiting" + self.name
def print_time(threadName,delay,counter):
    while counter:
        try:
            if exitFlag:
                thread.exit()
            time.sleep(delay)
            print "%s:%s" % (threadName, time.ctime(time.time()))
            counter -= 1
        except Exception,e:
            logging.info(e)
thread1 = myThread(1,"Thread-1",1)
thread2 = myThread(2,"Thread-2",2)

thread1.start()
thread2.start()

print "Exiting Main Thread"

python多線程threading.Lock鎖的用法

#建立鎖
mutex = threading.Lock()
#鎖定
mutex.acquire([timeout])
#釋放
mutex.release()

test_threading_lock.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import threading
import time

class my_thread(threading.Thread):
    def run(self):
        global num
        time.sleep(1)
        if mutex.acquire(1):
            num = num + 1
            msg =self.name + 'set num to '+str(num)
            print msg
            mutex.release()
num = 0
mutex = threading.Lock()
def test():
    for i in range(5):
        t = my_thread()
        t.start()
if __name__ == '__main__':
    test()

python 多線程中常用到的幾個方法,連結地址：http://blog.chinaunix.net/uid-27571599-id-3484048.html