[Async-sig] Cancelling a coroutine from a signal handler?

[Mark E. Haase]

On Tue, Apr 24, 2018 at 9:54 PM, Nathaniel Smith <njs at pobox.com> wrote:
>
> The simplest solution would be to use asyncio's native signal handler
> support instead of the signal module:
> https://docs.python.org/3/library/asyncio-eventloop.html#unix-signals
>

Ahh, wow, I don't know how I missed this. I've been obsessing over
coroutines and event loops for hours, now I realize that I misunderstood
the voodoo in the signal module. Thank you for pointing me in this
direction!

Alternatively, you can define a handler using signal.signal, and then
> arrange to re-enter the asyncio main loop yourself before calling
> Task.cancel. I believe that the only guaranteed-to-be-safe way to do
> this is:


This is also an interesting approach that I will experiment with. I guess
this solves problem #1 (works on Windows) but not #2 (task stuck in loop),
right? (The latter is a feature of all cooperative multitasking systems,
yeah?)

Great blog post today! I really enjoy your writing style and Trio is really
exciting.

Cheers,
Mark
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