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Within a module (say a.pm) used from a program (say b.pl), __FILE__ will be a.pm but $0 will be b.pl.

The test you posted checks whether the file that contains it is being run as a 'main' program, or is being used or required, or done or eval'd.


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In reply to Re: Difference between $0 and __FILE__ by BrowserUk
in thread Difference between $0 and __FILE__ by solegaonkar

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    [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
    [ambrus]: You hvae to be careful with the timer, because apparently Prima::Timer insists on being periodic, wheras AnyEvent::Impl:: Whatever::timer should give a one-shot timer watcher

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