From: pfay AT acl DOT lanl DOT gov (Patrick J. Fay)
Subject: Re: Initialising gnuwin DLLs
30 Jan 1998 03:02:18 -0800
Message-ID: <Pine.SGI.3.96.980129233312.6403C-100000.cygnus.gnu-win32@bluemountain.acl.lanl.gov>
References: <199801281358 DOT NAA07920 AT magpie DOT rpms DOT ac DOT uk>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
To: Matthew Brett <mbrett AT wren DOT rpms DOT ac DOT uk>
Cc: gnu-win32 AT cygnus DOT com, juerg DOT tschirren AT isbe DOT ch, r_urbin1 AT ridgecrest DOT ca DOT us,
        tvoverbe AT wk DOT estec DOT esa DOT nl

Hello Matthew,
I'm just guessing but it sounds like you are running into things that
are not thread-safe. You can allow on one thread into a code section
at a time with:
#include <stdio.h>
#include <windows.h>
CRITICAL_SECTION cs;
int main()
{
  int i;
  InitializeCriticalSection (&cs);
  EnterCriticalSection (&cs);
  printf("hello\n");
  LeaveCriticalSection (&cs);
  DeleteCriticalSection (&cs);
  return 0;
}

My guess is that, say, thread 1's printf calls malloc while
another thread is in malloc. What happens? who knows.
Pat
On Wed, 28 Jan 1998, Matthew Brett wrote:

> Dear All,
> 
> >From some recent messages, it looks as though several of us are having 
> difficulty using gnuwin DLLs with other software (such as VC++, matlab).
> Even something as innocent as a printf() command in the DLL causes 
> a memory access crash, with errors like:
> 
> The instruction at 0x1000c4ec referenced memory at 0x00000058
> 
> It's the same with many other functions: any file access function, malloc,
> pid, to name a random selection.  However, although malloc() causes a 
> crash, LocalAlloc does not.  I / we were wondering whether this was a DLL
> initialisation problem, and whether anyone knows how to initialise a
> gnuwin DLL properly for use by non-gnuwin apps.
> 
> Thanks for any help to the lost,
> 
> Matthew Brett
> 
> -
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> 

Patrick Fay, Ph.D., Intel Corp.            email:   pfay AT co DOT intel DOT com
Los Alamos National Lab                    wk:         (505) 665-9141
CTI M.S. B296                              fax:        (505) 667-5921
Los Alamos NM 87545    ASCI-RED http://www.acl.lanl.gov/~pfay/teraflop

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