Mail Archives: djgpp/2006/11/28/00:33:28
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From: | Denis Itskovich <shwon AT netvision DOT net DOT il>
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Newsgroups: | comp.os.msdos.djgpp
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Subject: | LWP & hw_exception under DJGPP
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Date: | Tue, 28 Nov 2006 06:51:18 +0200
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Organization: | NetVision InterNetNews site
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Lines: | 26
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Message-ID: | <ekgf85$4m0$1@news2.netvision.net.il>
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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Reply-To: | djgpp AT delorie DOT com
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Hi.
I'm taking a part in developing network driver for DOS. Due to some
reasons we need to enable some kind of multithreading. I tried to
implement it by myself, using IRQ0, but that failed (the program was
crashing). I have a couple of questions regarding the way LWP handles
timer interrupts. I'll be glad if one will answer, or will provide some
links about the LWP design.
Of course, I can use LWP as is, but I still want to understand how does
it work.
So the questions are:
1. Why not to make context switch directly from the interrupt
handler, instead of raising a SIGILL and handling the signal?
2. My program crashes, with SIGSEGV, when it tries to 'pop'
something from the stack, while SS points to segment with limit=0000FFF
and ESP=1000. What is that segment? I was sure, that DJGPP uses the flat
memory model - all data and code are sharing the same linear space, but
during the crash SS points to segment with different base address (which
differs from the base address pointed by CS, for example). Could you
explain what is the purpose of this weird segment?
Thank you a lot!
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