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Article #1259

Re: New and farcoreleft()

#1259
From: Dion Hollenbeck
Date: Thu, 03 Sep 1992 19:45
37 lines
2087 bytes
In article <1992Sep3.134102.17553@news2.cis.umn.edu>
wright@epx.cis.umn.edu (Mark Wright) writes:

Mark>      In a C++ program I've been writing, strategically placed
Mark>   farcoreleft()'s seem to be saying that my objects are not being
Mark>   de-allocated correctly when I 'destroy' them.  Should I worry about
Mark>   this, or is farcoreleft() designed for use with malloc()?  If so,
Mark>   is there a C++ function which will tell me how much mem. I have
Mark>   left?  I'm using Borland C++ v3.1.

Yes it is designed for use with malloc().  It is probably working
correctly, you probably do not know how it is working.

Start out with 1000 bytes to allocate

	a = malloc(10)
	b = malloc(10)
	farcoreleft() will return 980
	free(a)
	farcoreleft() will return 980
	free(b)
	farcoreleft() will return 1000

farcoreleft() will return the amount of memory between the last amount
of memory allocated and the top of memory, therefore not accounting
for the memory returned to the pool when you free chunks not at the
end of the pool.  farcoreleft() will eventually return the "base"
value seen before any allocations were made, once you have freed
everything allocated.

If this does not explain the behavior you are seeing, then maybe there
is something wrong.

-- 
Dion Hollenbeck       UUCP: {uunet, ucsd, sun}!megatek!hollen
                      INTERNET:            hollen@megatek.com
Megatek Corporation  9645 Scranton Rd.  San Diego, Ca.  92121
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From: hollen@megatek.UUCP (Dion Hollenbeck)
Newsgroups: comp.os.msdos.programmer
Subject: Re: New and farcoreleft()
Message-ID: <HOLLEN.92Sep3114500@peg.megatek.UUCP>
Date: 3 Sep 92 19:45:00 GMT
References: <1992Sep3.134102.17553@news2.cis.umn.edu>
Sender: hollen@megatek.com (Dion Hollenbeck)
Organization: Megatek Corporation, San Diego, California
Lines: 37
In-Reply-To: wright@epx.cis.umn.edu's message of Thu, 3 Sep 1992 13: 41:02 GMT