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Date:	Thu, 2 May 2002 17:03:24 +0200 (MEST)
From:	ahelm AT gmx DOT net
To:	djgpp AT delorie DOT com
MIME-Version:	1.0
Subject:	segfault on context switch
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Reply-To:	djgpp AT delorie DOT com

Hi,

I'm having some troubles with a djgpp compiled program.

The program is reading/writing data from/to a com port using 
the svasync library. No problems in plain DOS, but when I'm
running WinNT4.0 and do a context switch (Alt-TAB) while the
program is running I get a segfault in malloc(). No problems
without context switch though ...

Does that ring a bell anywhere? Is this a known WinNT "feature"?

Usually it means that memory is corrupted somewhere before
malloc() is called, but why does this only happen on Alt-TAB???

The segfault doesn't happen at the same malloc() call each time. 
But so far I've only seen it originating from functions invoked 
by the bison parser I use for parsing the serial input (which
isn't really surprising as it is running most of the time).

I'm using DJGPP v2.03 with GCC v2.95.3, binaries about 6 months old.

Tony

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