Python中的線程與發送到線程的參數

Question

我想運行兩個線程，每個線程都有一個參數傳遞給它來處理。但是，看起來線程按順序運行，而不是並行運行。證人：

$ cat threading-stackoverflow.py 
import threading 

class CallSomebody (threading.Thread): 
     def __init__(self, target, *args): 
       self._target = target 
       self._args = args 
       threading.Thread.__init__(self) 

     def run (self): 
       self._target(*self._args) 

def call (who): 
     while True: 
       print "Who you gonna call? %s" % (str(who)) 

a=CallSomebody(call, 'Ghostbusters!') 
a.daemon=True 
a.start() 
a.join() 

b=CallSomebody(call, 'The Exorcist!') 
b.daemon=True 
b.start() 
b.join() 

$ python threading-stackoverflow.py 
Who you gonna call? Ghostbusters! 
Who you gonna call? Ghostbusters! 
Who you gonna call? Ghostbusters! 
Who you gonna call? Ghostbusters! 
Who you gonna call? Ghostbusters! 
Who you gonna call? Ghostbusters! 
Who you gonna call? Ghostbusters! 

我希望有一些線路返回Ghostbusters!和其他人返回The Exorcist!，但是Ghostbusters!線永遠持續下去。必須重構什麼才能讓每個線程獲得一些處理器時間？

Answer 1

這是你的問題：b.start()

之前調用a.join()你想要的東西更像：

a=CallSomebody(call, 'Ghostbusters!') 
a.daemon=True 
b=CallSomebody(call, 'The Exorcist!') 
b.daemon=True 
a.start() 
b.start() 
a.join() 
b.join()