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Re: alloca and GC

From: Keisuke Nishida
Subject: Re: alloca and GC
Date: Mon, 29 Jan 2001 14:23:51 -0500
User-agent: Wanderlust/2.4.0 (Rio) SEMI/1.13.7 (Awazu) FLIM/1.13.2 (Kasanui) Emacs/21.0.96 (i686-pc-linux-gnu) MULE/5.0 (SAKAKI)

At Mon, 29 Jan 2001 10:47:57 +0100 (MET),
Thomas Wawrzinek wrote:
>  > But to get back to your original question: since the malloc-based
>  > alloca returns blocks allocated from the heap, which Guile's GC won't
>  > scan, your example above won't work with the malloc-based alloca.
>  > Since you can't tell which alloca you're using, I'd recommend against
>  > it.
> Right! I once found that an alloca() implementation wasn't threadsafe (this
> was an old GNU implementation under Windoze, but probably not the one
> supported in gcc).
> Considering the diverse dependencies (compiler, OS), and the resulting
> differences in behavior, not to use alloca() seems to be the right thing to
> me, too.

I see.  I have noticed that alloca is not a standard function
and decided not to use it.  Thanks again.

(BTW, I'm reworking on my VM these days.  Hopefully, it will
come soon (target: in a month) with many improvements.)


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