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2014-09-25T09:21:06Z Krystof: once upon a time, I read somewhere the idea that lexical scope in the language is neatly implemented by dynamic scope in the interpreter/compiler
2014-09-25T09:21:15Z Krystof: does anyone know where I read that?
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2014-09-25T09:50:17Z prxq: I have this foreign lib that calls a callback. If there is an error in the callback, I'd like to ensure a clean unwind of the stack, by passing the appropriate return value to the caller. Is there a standard, documented way of doing that?
2014-09-25T09:53:37Z flip214: unwind-protect in the callback?
2014-09-25T09:54:38Z prxq: that calls the unwind-protect form, but after it exits, the stack gets unwinded and the caller isn't active again.
2014-09-25T09:55:19Z prxq: The stack looks like this | top-level | foreign-function | callback | (unwind-protect ... <cleanup>)
2014-09-25T09:55:47Z prxq: <cleanup> can't enforce clean unwind of the foreign function
2014-09-25T09:56:20Z stassats: looks fine
2014-09-25T09:56:59Z prxq: no, that corrupts the state of the foreign library
2014-09-25T09:58:35Z stassats: so, why aren't you using handler-case?
2014-09-25T09:59:04Z stassats: or making a proper <cleanup> form?
2014-09-25T09:59:59Z prxq: if the foreign function has allocated stuff by itself, I can't do anything about it in the cleanup form. Or am I misunderstanding something?
2014-09-25T10:00:28Z stassats: unwind-protect doesn't deal with the foreign function
2014-09-25T10:01:18Z stassats: but you need unwind-protect if you want to handle all cases of NLX, otherwise, handler-case is simpler
2014-09-25T10:01:28Z prxq: nlx?
2014-09-25T10:06:33Z prxq: what I'm looking for is a way to trap stack unwinding at callback, return a value to foreign function that ensures it cleans up, and the continue the stack unwinding when the foreign functin returns.
2014-09-25T10:08:44Z prxq: (is the problem clear?)
2014-09-25T10:09:54Z stassats: you can't do _that_
2014-09-25T10:12:37Z prxq: hm, i see
2014-09-25T10:13:18Z stassats: if all you want to deal with are errors, then just catch them and resignal them
2014-09-25T10:16:57Z stassats: actually, it can be a nice extension
2014-09-25T10:18:04Z prxq: this makes it hard to debug the callback :-)
2014-09-25T10:18:14Z prxq wants a pony, apparently
2014-09-25T10:18:40Z stassats: commonqt just has a restart "return from the callback"
2014-09-25T10:19:06Z prxq: ah, cool.
2014-09-25T10:19:07Z stassats: so you can both debug and not corrupt the foreign code
2014-09-25T10:20:59Z prxq is going to take a closer look
2014-09-25T10:21:02Z prxq: thanks, stassats
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2014-09-25T12:47:58Z scymtym: our management was quite positive about having an SBCL meeting in Bielefeld (especially because of SBCL's experience as a gsoc mentoring organization). they suggested i should gather some rough estimates w.r.t. time, duration and number of participants of the meeting before getting back to them for a more detailed discussion.
2014-09-25T13:00:17Z pkhuong: Krystof: I think I noted the lex scope/dyn scope thing in a blog post once.
2014-09-25T13:00:44Z pkhuong: not really true for *interpreters*, though
2014-09-25T13:01:33Z pkhuong: but I think it's just common knowledge that no one felt the need to write down?
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2014-09-25T13:08:52Z Krystof: yeah, maybe.  Maybe I read it in LiSP
2014-09-25T13:08:55Z Krystof: or SICP
2014-09-25T13:09:44Z Krystof: oh well
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2014-09-25T17:48:30Z tmh_: ac l/win 45
2014-09-25T17:48:32Z tmh_: sorry
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2014-09-25T19:25:49Z fe[nl]ix: Krystof: your blog posts are too articulate
2014-09-25T19:26:09Z fe[nl]ix: I'll have to schedule time to study them(the last two)
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2014-09-25T19:55:11Z Krystof: fe[nl]ix: by "articulate" do you mean "prolix"? :)
2014-09-25T19:55:22Z nyef: Verbose?
2014-09-25T19:55:42Z Krystof: garrulous?
2014-09-25T19:55:44Z fe[nl]ix: detailed
2014-09-25T19:55:57Z Krystof: :-)
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2014-09-25T20:17:53Z pkhuong: Krystof: ok, I think we can do that transform with composable codewalkers.
2014-09-25T20:18:00Z pkhuong: perhaps later this week
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