python队列join

如果要让一个任务队列按照顺序进行，则必须使用join,代码如下：

'''
Created on Dec 23, 2013

@author: long
'''
import threading
from threading import Thread
import time

class Thread1(Thread):
    '''
    classdocs
    '''

    def __init__(self,thread_name):
        '''
        Constructor
        '''
        Thread.__init__(self,name=thread_name)

    def run(self):
        '''
        run method
        '''
        count = 0
        while True:
            print ('thread--',self.getName(),",count:",count)
            time.sleep(0.5)
            count = count + 1
            if count > 10:
                break

def main():

    for y in range(1, 3):
        thread1 = Thread1('longthread' + str(y))
        thread1.start()
        if thread1.isAlive():
            thread1.join()

    for i in range(50):
        print ('main:', i)

if __name__ == "__main__":
    main()    

　结果是先执行名为'longthread1',再'longthread2'，再是主进程，所以thread1.join()的意思是等thread1执行完，再去执行其他线程。