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Subject:	multitasking/threading in DJGPP
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From:	batchex <thedark1NOthSPAM AT phreaker DOT net DOT invalid>
Newsgroups:	comp.os.msdos.djgpp
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Date:	Sun, 18 Jun 2000 13:36:31 -0700
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Hi,

I'm thinking about writing a preempative multithreading lib with
djgpp. I want it to be all done in software, not using TSS. The
first problem I can think of is providing & preserving seperate
stacks for every thread. I'm thinking about allocating some
memory for stack every time a thread is registered, and change
SS:ESP to the address of the allocated stack for the current
thread in every task/thread switch (by means of timer
interrupt). Of course all the registers will be preserved during
the task/thread switch.

How much memory must I allocate per stacks just to be save? and
does the approach I'm thinking is save? I want to use one global
memory for all the threads, no address space partitioning.

Any help, suggestion and ideas as well to URLs to
multitasking/threading tuts in C are greatly appreciated.

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