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Message-ID: <20020917192111.78396.qmail@web10002.mail.yahoo.com>
Date: Tue, 17 Sep 2002 12:21:11 -0700 (PDT)
From: Tirth Sanyal <tsanyal AT yahoo DOT com>
Subject: Re: Memory Leak - DLL problem
To: cygwin AT cygwin DOT com
Cc: Danny Smith <dannysmith AT users DOT sourceforge DOT net>, dwsharp AT iee DOT org
In-Reply-To: <000101c25c76$55e45980$a899a7cb@DANNY>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii

Hi,
I tried allocating and deallocating on the same heap
i.e. the heap belonging to the DLL. However, the
problem still persists. Looks like there might be some
other problem.

I have uploaded the modified version of the programs
as a tarball with a README file for installing and
running the program should you decide to try it out
yourself. Here is the url:
http:://www.cs.ucsb.edu/~tsanyal/mem_leak_demo.tgz

Would appreciate any more ideas.
Thanks.

-Tirth

--- Danny Smith <dannysmith AT clear DOT net DOT nz> wrote:
> Don Sharp - Re: Memory Leak - DLL problemRe: Memory
> Leak - DLL problem
> From: Don Sharp <dwsharp at iee dot org>
> To: gnuwin32 <cygwin at cygwin dot com>
> Date: Sat, 14 Sep 2002 21:13:56 +0100
> Subject: Re: Memory Leak - DLL problem
> References:
> <20020914194429 DOT 961 DOT qmail AT web10003 DOT mail DOT yahoo DOT com>
> 
> 
> 
> Tirth Sanyal wrote:
> >
> > Hi,
> >
> > I have been encountering a strange memory leak
> problem
> > in my code which has prompted me to write a small
> > program to isolate and demonstrate it. I have
> pasted
> > the code at the bottom of the email.
> >
> >
> > - In a DLL say libfoo, I define and export a class
> > Base and also export a function "foo" whose
> interface
> > is the following:
> >   Base* foo(void)
> >
> > - "foo" instantiates an object of the class Base
> and
> > returns a pointer to this object.
> >
> > - In my application (which has the main routine) I
> > load the dynamic library libfoo, call function
> "foo"
> > in it , get the pointer to the newly created
> object
> > and immediately call "delete" on this pointer.
> >
> > - The destructor function of the class Base
> contained
> > in the libfoo DLL is called.
> >
> >
> 
> 
> There is an article called 'DLL Maintenance Made
> Easy'  by Geoff
> Vandegrift . It used to be at
> www.devx.com/free/mgznarch/vcdj but best to do a
> Google search.
> 
> It explains, among other things, how to  "wrap"
> memory allocations and
> de-allocations so that you don't get leakage problem
> from allocating
> memory on one heap and de-allocating in another.
> 
> Danny
> 


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