Python学习之路：守护线程

Posted 2020-10-28 Py小白

守护线程：只起到守护主线程的作用，主线程退出守护线程也跟着退出。

 1 import threading,time
 2 
 3 def run(n):
 4     print("task",n)
 5     time.sleep(2)
 6     print("task done",n)
 7 
 8 start_time = time.time()
 9 t_objs =  []
10 for i in range(50):
11     t = threading.Thread(target=run,args=("t-%s"%i,))
12     t.setDaemon(True)#把当前线程设置为守护线程
13     t.start()
14     t_objs.append(t)#为了不阻塞后面线程的启动，不在这里join,先放到一个列表里
15 
16 # for t in t_objs:#循环线程实例列表，等待所有线程执行完毕
17 #     t.join()
18 
19 print("------all threads has finished....",threading.current_thread(),)
20 print("cost:",time.time()-start_time)
21 
22     # t1 = threading.Thread(target=run,args=("t1",))
23     # t2 = threading.Thread(target=run,args=("t2",))
24     # t1.start()
25     # t2.start()
26 
27 # run("t1")
28 # run("t2")

守护线程练习