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Re^3: threads and their alternatives

by BrowserUk (Pope)
on Oct 02, 2011 at 06:50 UTC ( #929109=note: print w/replies, xml ) Need Help??


in reply to Re^2: threads and their alternatives
in thread Alternatives to threads for maintaining GUI app responsiveness

Would you be up for the challenge of producing a demo solution for the OPs described problem using one of the event-based frameworks?

If so, I'll do a threaded version and we could compare them for complexity.

If you're up for it, we could start with a simple GUI in Tk or GTK that presents data as a list -- zentara has posted many examples we could use as a starting point -- and then we add a few buttons that are used to control which records are SELECTed from a simple SQLite database using an SQL query via DBI.

Contrasting two working solutions would be far more useful that contrasting our opinions I think.


Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

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Re^4: threads and their alternatives
by zwon (Abbot) on Oct 02, 2011 at 09:33 UTC
    Would you be up for the challenge

    No way, I have better ways to spend Sunday. BTW, in this particular case I would probably use separate process for GUI (or even thread, I'm not a bigot), I don't see the reason you're trying to limit me with event-based solution.

      No way.

      Thought not. Many will advocate them, but none will offer code. Why do you think that is?

      I don't see the reason you're trying to limit me with event-based solution.

      Because you came out in strong support of them.


      Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
      "Science is about questioning the status quo. Questioning authority".
      In the absence of evidence, opinion is indistinguishable from prejudice.

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[Corion]: The "and I understand it" part is optional.
[Corion]: ambrus: Yes but I also need to implement the file / IO watcher, because Prima has that (in Prima::File), and I need to supply the appropriate thing to make push_write etc. work with Prima
[ambrus]: Corion: yes, you need to implement the io watcher, which should be simple because Prima::File is basically that, and the timer watcher form Prima::Timer
[Corion]: ... or so I think. As I said, I'm somewhat vague on how to make AnyEvent cooperate with a callback-driven IO event loop that gives me callbacks when data is available or can be written
[ambrus]: what push_write thing? I don't think you need that. that's implemented generically by AnyEvent::Handle
[Corion]: ambrus: Yeah, that's what I think as well. But you give me an idea, maybe I should start with implementing the timer, as that should be far simpler and with fewer edge-cases/nasty interaction than the file watcher
[ambrus]: You only provide the watcher part that tells when the handle is readable or writable, not the actual writing and reading.
[Corion]: ambrus: Hmmm. It makes sense that AnyEvent would implement the push_write itself, but I think I don't have a good idea of where the boundary between AnyEvent and the underlying event system lies... Implementing the timer should give me a better idea
[ambrus]: Corion: push_write is in the higher level abstraction of AnyEvent::Handle, not in the watcher
[Corion]: ambrus: Hmm - rereading Prima::File, that merrily coincides with what Prima does - it tells you "you can read", and you're supposed to read from the fh yourself. I thought it called you with the data already read, which would've been harder to integrate

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