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Date: 17 May 2004 12:08:58 +0200
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From: Eli Zaretskii <eliz AT gnu DOT org>
To: djgpp AT delorie DOT com
In-reply-to: <Pine.GSO.4.58.0405170936310.4679@ural2> (message from Gabriel
	Zoltan on Mon, 17 May 2004 09:47:05 +0200 (MEST))
Subject: Re: Task switch with SIGALRM
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> Date: Mon, 17 May 2004 09:47:05 +0200 (MEST)
> From: Gabriel Zoltan <gz331 AT hszk DOT bme DOT hu>
> 
> My problem is that tasks run OK for the first time, but when the scheduler
> tries to run them again, the system crashes (with various reasons:
> stack fault, GPF).

It would help tremendously if you'd post here the full message printed
when the program crashes, complete with the registers' dump and
SYMIFY'd backtrace.  If, as you write, there are several different
types of crashes (GPF, stack fault, etc.), please try to post an
example for each one of them.

FYI, the DJGPP FAQ list includes in section 12.2 some info that will
help you to interpret the crash dump messages.