How to reset a thread when it finishes

Question

I am using kivy and I'm trying to find a way to "reset" my thread after its finished, though I know that resetting threads is impossible. So, how would I have a thread run after its run once before if I tell it to? I have a screen set up with a button that when pressed runs a thread for 5 seconds then after 5 seconds returns me to the original screen, But if I press the button after its been pressed before I get an error saying threads can only be used once. Here is the code for the thread. I'm calling it when the screen first appears using on_pre_enter()

def countdown1():
    seconds = 5
    for i in range(seconds):
        timeleft = seconds-i
        print(str(timeleft) + " seconds remain")
        time.sleep(1)
    print("out of time")
    sm.current = "Evaluation"
    seconds = 5

countdown1_thread = threading.Thread(target = countdown1)

Does this answer your question? [Is it legal to call the start method twice on the same Thread?](https://stackoverflow.com/questions/1215548/is-it-legal-to-call-the-start-method-twice-on-the-same-thread) — stovfl, Apr 09 '20 at 18:34
`Button: pos_hint:{"x":0.5, "y": 0.6} size_hint:0.3,0.1 text: "press me" on_release: app.root.current = "Questions" root.manager.transition.direction = "right"` — nekros prime, Apr 09 '20 at 18:35
It's in my Kv file and takes me to the screen where the thread is run. But if I press it after the thread is run I get th error — nekros prime, Apr 09 '20 at 18:37
`def on_pre_enter(self): print("callback") countdown1_thread.start()` — nekros prime, Apr 09 '20 at 18:39
The thread is started using `on_pre_enter()` not with the button. The button just loads the page where the thread is started — nekros prime, Apr 09 '20 at 18:40

score 0 · Accepted Answer · answered Apr 09 '20 at 18:41

0

Try replacing

countdown1_thread.start()

with:

threading.Thread(target = countdown1).start()

answered Apr 09 '20 at 18:41

John Anderson

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How to reset a thread when it finishes

1 Answers1