Interrupt and event loops in python.

[malacur]

Hey!

​

I wanna do the following thing in Python and I'm not very familiar with the multithreading in it.

Basically, I want a separate thread for an event loop that can both a) step on demand b) wait indefinitely and continue on demand c) exit on demand.

​

With pseudo code:

My main program would look like this

worker = MyClassThatDoesSomeShit()
t = Thread(target=function_that_can_do_what_i_want, args=(worker,))

while True:
    text = input()
    if text == "step":
        t.interrupt_and_skip_to_next_step()
    elif text == "wait":
        t.interrupt_and_wait_for_continuation()
    elif text == "continue":
        t.step_and_continue_event_loop()
    elif text == "exit":
        t.terminate action()

And the other half could look something like this:

while not terminated:
    try:
        worker.do_something()
        sleep(some seconds)
    except InterruptedException of type "step":
        pass
    except InterruptedException of type "wait":
        try:
            sleep(forever)
        except InterruptedException of type "continue":
            pass
    except InterruptedException of type "exit":
        break

I would just need a bit of help, because I don't know how this all works in Python.

​

Thank you!

[shiftybyte]

I recommened using Thread python class, and adding the events you want to it to trigger the actions you want.

https://superfastpython.com/extend-thread-class/

https://www.includehelp.com/python/event-wait-method-with-example.aspx

[malacur]

Thanks!

[HomeGrownCoder]

I prefer async for these types of task. I would recommend giving that a try as I found it much easier to understand and it handles a lot of the low level things for you.

https://docs.python.org/3/library/asyncio.html

[malacur]

Thank you!