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Re: asyncio - run coroutine in the background

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From "Frank Millman" <frank@chagford.com>
Newsgroups comp.lang.python
Subject Re: asyncio - run coroutine in the background
Date Mon, 15 Feb 2016 09:16:34 +0200
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"Marko Rauhamaa"  wrote in message news:8737sumpjl.fsf@elektro.pacujo.net...
>
> "Frank Millman" <frank@chagford.com>:
>
> > Using asyncio, there are times when I want to execute a coroutine which
> > is time-consuming. I do not need the result immediately, and I do not
> > want to block the current task, so I want to run it in the background.
>
> You can't run code "in the background" using asyncio. Coroutines perform
> cooperative multitasking in a single thread on a single CPU.
>
> Parallel processing requires the use of threads or, often preferably,
> processes.
>
> To put it in another way, never run time-consuming code in asyncio.
>

No arguments there.

I started with a task that ran quickly, but as I added stuff it started to 
slow down.

The execution of the task involves calling some existing functions, which 
are themselves coroutines. As you have noted elsewhere, once you turn one 
function into a coroutine, all calls higher up the chain have to be 
coroutines as well.

The benefit of my class is that it enables me to take the coroutine and run 
it in another thread, without having to re-engineer the whole thing.

Hope this makes sense.

Frank

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Thread

asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-15 08:35 +0200
  Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-15 08:54 +0200
    Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-15 09:16 +0200
      Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-15 09:34 +0200
      Re: asyncio - run coroutine in the background Paul Rubin <no.email@nospam.invalid> - 2016-02-14 23:39 -0800
        Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-15 10:17 +0200
        Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-15 13:05 +0200
        Re: asyncio - run coroutine in the background Chris Angelico <rosuav@gmail.com> - 2016-02-16 16:51 +1100
        Re: asyncio - run coroutine in the background Kevin Conway <kevinjacobconway@gmail.com> - 2016-02-16 13:22 +0000
          Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 16:17 +0200
            Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-16 16:36 +0200
            Re: asyncio - run coroutine in the background Kevin Conway <kevinjacobconway@gmail.com> - 2016-02-16 14:54 +0000
            Re: asyncio - run coroutine in the background Steven D'Aprano <steve@pearwood.info> - 2016-02-17 02:17 +1100
              Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:12 +0200
                Re: asyncio - run coroutine in the background Paul Rubin <no.email@nospam.invalid> - 2016-02-17 20:38 -0800
                Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-18 08:10 +0200
              Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:13 +0200
              Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:14 +0200
              Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:15 +0200
                Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:15 +0200
                Re: asyncio - run coroutine in the background Robin Becker <robin@reportlab.com> - 2016-02-16 17:52 +0000
            Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-16 17:21 +0200
              Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:20 +0200
                Re: asyncio - run coroutine in the background Paul Rubin <no.email@nospam.invalid> - 2016-02-19 23:40 -0800
                Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-20 10:13 +0200
                Re: asyncio - run coroutine in the background Paul Rubin <no.email@nospam.invalid> - 2016-02-20 00:37 -0800
                Re: asyncio - run coroutine in the background Chris Angelico <rosuav@gmail.com> - 2016-02-20 19:52 +1100
                Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-20 10:59 +0200
                Re: asyncio - run coroutine in the background Chris Angelico <rosuav@gmail.com> - 2016-02-20 20:02 +1100
                Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-20 11:28 +0200
                Re: asyncio - run coroutine in the background Kevin Conway <kevinjacobconway@gmail.com> - 2016-02-20 13:52 +0000
                Re: asyncio - run coroutine in the background "Martin A. Brown" <martin@linux-ip.net> - 2016-02-20 09:45 -0800
                Re: asyncio - run coroutine in the background Chris Angelico <rosuav@gmail.com> - 2016-02-21 08:47 +1100
            Re: asyncio - run coroutine in the background Chris Angelico <rosuav@gmail.com> - 2016-02-17 02:28 +1100
            Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-16 17:45 +0200
        Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-16 15:52 +0200

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