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Re: threads in 1.7.1

From: Neil Jerram
Subject: Re: threads in 1.7.1
Date: Wed, 13 Oct 2004 20:01:39 +0100
User-agent: Mozilla/5.0 (X11; U; Linux 2.4.4-4GB i686; en-US; 0.8.1) Gecko/20010515

Julian Graham wrote:

If I started trolling, do you think I'd get more responses to my

I wonder the same myself :-)

 Just kidding.  Anyway, I know you're all busy with real
work and the like, but Marius (since I'm told this is pretty much your
domain) -- is there any reason that Guile *shouldn't* support thread
cancellation?  I was thinking maybe I'd just try to write it myself
and submit a patch, unless there was some philosophical opposition to
that idea.

FWIW, with me not being at all an expert on this area:

- It isn't yet possible to have more than one thread of C code call Guile functions.

- Guile's threads in 1.7.1, OTOH, are compatible with Posix threads, because they are Posix threads. In more detail:

- Guile 1.6.x supported coop threads, and kind-of Posix threads (with some kind of hack I believe)

- Guile 1.7.x has dropped coop threads, and now only supports Posix threads.

(I'm not sure of the rationale for dropping coop threads; personally I'm a fan of them.)

- I doubt it would Just Work to call pthread_cancel on a Scheme thread, because of the per-thread state that Guile maintains. I'd guess, though, that it shouldn't be hard to add cancellation support, given that Guile threads are now Posix threads.

Hopefully this is all sufficiently inaccurate that someone will be forced to correct it :-)


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