用threading模組的join函式可以檢測執行緒是否結束

如果只能用thread模組,可以使用標誌位,不過效率比較低,程式碼風格也不好

這個相當於自旋鎖

from time import sleep,ctime

import thread

def loop0(sign):

print "start loop 0 at:",ctime()

sleep(4)

print "loop 0 done at:",ctime()

sign[0]=True

def loop1(sign):

print "start loop 1 at:",ctime()

sleep(2)

print "loop 1 done at:",ctime()

sign[1]=True

def main():

print "starting at:",ctime()

sign=[False,False]

thread.start_new_thread(loop0,(sign,))

thread.start_new_thread(loop1,(sign,))

while not all(sign):pass

print "all DONE at:",ctime()

if __name__=="__main__":

main()