如何检查由模块线程（在Python 3 _thread中）构成的线程是否正在运行？

Question

Yet the thread module works for me. How to check if thread made by module thread (in Python 3 _thread) is running? When the function the thread is doing ends, the thread ends too, or doesn't?

def __init__(self):
    self.thread =None
......
if self.thread==None or not self.thread.isAlive() :
        self.thread = thread.start_new_thread(self.dosomething,())
else:
        tkMessageBox.showwarning("XXXX","There's no need to have more than two threads")

I know there is no function called isAlive() in "thread" module, is there any alternative?

But there isn't any reason why to use "threading" module, is there?

Answer 1

Unless you really need the low-level capabilities of the internal thread ( _thread module, you really should use the threading module instead. It makes everything easier to use and does come with helpers such as is_alive .

Btw. the alternative of restarting a thread like you do in your example code would be to keep it running but have it wait for additional jobs. Eg you could have a queue somewhere which keeps track of all jobs you want the thread to do, and the thread keeps working on them until the queue is empty—and then it will not terminate but wait for new jobs to appear. And only at the end of the application, you signalize the thread to stop waiting and terminate it.