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Re: Patch for fields of `struct buffer'

From: David De La Harpe Golden
Subject: Re: Patch for fields of `struct buffer'
Date: Mon, 31 Jan 2011 16:46:22 +0000
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On 31/01/11 14:29, Tom Tromey wrote:

One easy one is whether a new thread should inherit thread-local
bindings from its parent thread.  Our initial implementation did
inherit, but later I found out that this is not common in the Lisp

I'd suggest going with CL afaik-now-most-common-practice and not inherit. Isn't that easier implementation-wise anyway?

General api similarity to CL bordeaux-threads if doing conventional threads seems reasonable - I haven't thought especially deeply about it, but I doubt emacs lisp needs are particularly different to CL, and threading is no longer a new thing in CL land.

You can see the bordeaux threads api documentation without diving into any implementation source code (the reference implementation's license is open, but anyway):


Because historically some CLs did one thing and others the other, you can see it recommends all bindings are redone anyway in portable code.

Also note how recent bordeaux-threads' make-thread takes an initial-bindings alist arg though, that defaults to the local value of *default-special-bindings*. So not "simply" inheriting local let bindings doesn't mean you can't provide a mechanism for establishing some thread-local initial bindings that don't correspond to the globals when you do want to do that - in fact you'll ultimately probably *want* to
have such a mechanism, some things are likely "naturally thread local".

The current version of that spec for the aforementioned initial-bindings/*default-special-bindings* considers it an open question whether the binding forms are evaluated in the original or new thread, but I expect new thread makes more sense, and is what recent clisp does:


(clisp also has symbol-value-thread, for accessing thread-local

OTOH, maybe someone who's been writing multithreaded lisp recently might want to chime in...

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