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Re: fork and spoon

by Illuminatus (Curate)
on Apr 03, 2011 at 00:44 UTC ( #897131=note: print w/replies, xml ) Need Help??


in reply to fork and spoon

The first thing you are doing wrong is not posting the code (ie the manager, or at least the part that is running the updater) that is not working :). Without seeing what you are doing in the code that is not working, it is very hard to diagnose. I can't tell what you are actually calling in the backticks or system(), whether it is hanging where you think it is hanging, etc.

fnord

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Re^2: fork and spoon
by Sly_G (Novice) on Apr 03, 2011 at 13:55 UTC
    It's pretty straightforward. Variations that I tried are:
    system("update.pl &"); system("update.pl"); `update.pl &` `update.pl`
    And update.pl is -rwxr-xr-x and it starts OK from bash shell.

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[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
[ambrus]: you just need an io watcher, created by &AnyEvent::Impl:: Whatever::io(...)
[Corion]: So after talking it through with you even while I'm still not entirely clear on where AE ends and my implementation begins, I think I understand that I only need to implement some smaller parts for each functionality I want to support.
[Corion]: Yeah... and you might even be able to mix and match additional functionality if you have additional async suppliers, like from a separate thread

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