[issue39765] asyncio loop.add_signal_handler() may not behave as expected

[LtWorf]

LtWorf  added the comment:

This looks related to: https://bugs.python.org/issue32443

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nosy: +tiposchi

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[issue39765] asyncio loop.add_signal_handler() may not behave as expected

[Andrew Svetlov]

Andrew Svetlov  added the comment:

Other threads are not related.

Speaking about the main thread that runs an event loop with the signal handler 
installed -- the handler is executed along with other async code.
If the loop executes some user-provides async task -- it executes the signal 
handler as well if needed.

This is why I suspect that the discussed program is not completely correct.

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[issue39765] asyncio loop.add_signal_handler() may not behave as expected

[Roger Dahl]

Roger Dahl  added the comment:

> I'm sorry. but loop.set_signal_handler() method doesn't exist.

Oops, fixed.

> Assuming you mean loop.add_signal_handler() method, I would say that a 
> minute-long delay is a sign of long blocking calls in your program.

During the delay for the callback to occur, I see my program logging work 
performed on other asyncio tasks and receiving timer events from another 
thread. So, not long blocking?

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[issue39765] asyncio loop.add_signal_handler() may not behave as expected

[Andrew Svetlov]

Andrew Svetlov  added the comment:

Assuming you mean loop.add_signal_handler() method, I would say that a 
minute-long delay is a sign of long blocking calls in your program.

Typical asyncio program blocks the loop for 1-10 milliseconds at most, and 
signal handlers are called with this delay.
This is not your case as I see.

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title: asyncio loop.set_signal_handler() may not behave as expected -> asyncio 
loop.add_signal_handler() may not behave as expected

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