Great, thank you! I'll try it out, looks promising.

On Fri, Feb 8, 2019 at 5:37 PM Ben Darnell <ben@bendarnell.com> wrote:

Asyncio's debug mode does this (and a few more things). Call `asyncio.get_event_loop().set_debug()` to enable it. 

https://docs.python.org/3/library/asyncio-dev.html#debug-mode

-Ben

On Fri, Feb 8, 2019 at 5:10 PM Yusuke Tsutsumi <yusuke@tsutsumi.io> wrote:

Hi,

In tornado, there's a really nice feature called set_blocking_signal_threshold, which sets a signal that fires if a coroutine has been running for too long without returning control back to the main loop:

https://www.tornadoweb.org/en/stable/ioloop.html?highlight=signal#tornado.ioloop.IOLoop.set_blocking_signal_threshold

In tornado this will then log the traceback of the coroutine in question. This has been a very valuable tool when a developer accidentally introduces code that blocks the event loop for way too long of a time.

Is there an equivalent in asyncio? I have a sketch in my head of how to implement that, but wanted to see if it existed somewhere first.

Thanks!

-Yusuke

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