From:	Tudor <tudor AT cam DOT org>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: windows <-> cwsdpmi
Date:	Sat, 28 Dec 1996 20:41:20 -0800
Organization:	Communications Accesibles Montreal
Lines:	44
Message-ID:	<32C5F670.191C@cam.org>
References:	<851364688 DOT 618879 DOT 0 AT abwillms DOT demon DOT co DOT uk> <59mpup$csp AT vidar DOT diku DOT dk>
Reply-To:	tudor AT cam DOT org
NNTP-Posting-Host:	dynppp-96.hip.cam.org
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Morten Welinder wrote:
> 
> "Alaric B. Williams" <alaric AT abwillms DOT demon DOT co DOT uk> writes:
> 
> >Conservative GC can be used in C. It works like so:
> 
> You cannot garbage collect in C unless you restrict the class
> of valid programs.
> 
> Consider:
> 
> -----------------------------------------------------------------------------
> m = malloc (...);
> <fill something into m's data area>
> <print m's address to a file, possibly using fprintf's %p>
> m = 0;
> ...
> <let garbage collection happen here>
> ...
> <reread m's address>
> <access m's data area>
> -----------------------------------------------------------------------------
> 
> There is no way that the garbage collector could know that m's data
> area was pointed to by something in a file.
> 
> But all this should not be taken to mean that a garbage collector
> used in connection with C can not be useful.  This is just theory.
> 
> Morten
not necessarely.I got a file on my hard that implements a garbage
collector in c++;it automatically deallocates an object when it isn't
pointed at anymore.I got it from the "byte" site,in the archives,on the
oldest '95 entry.
-- 
tudor 'at' cam 'dot' org
http://www.cam.org/~tudor

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