进程中t.start(), t.daemon() t.jion()的使用

 #!/usr/bin/env python
 import multiprocessing
 import time
 def f1(a1):
     time.sleep(2)
     print(a1)
 if __name__ == '__main__':
     t = multiprocessing.Process(target=f1,args=(11,))
     t.daemon = False
     t.start()
     t.join(2)
     t2 = multiprocessing.Process(target=f1, args=(22,))
     t2.daemon = False
     t2.start()
     t.join(1)
     print("end")