Date: Fri, 9 Aug 1996 14:13:10 +0200 (DFT)
From: "Garrido Freire, Fco. Javier ((R)JA.GAR. SOFT)" <garridof AT cs DOT us DOT es>
Reply-To: Garrido Freire <Francisco-Javier DOT Garrido AT cs DOT us DOT es>
To: Orlando Andico <orly AT gibson DOT eee DOT upd DOT edu DOT ph>
cc: djgpp AT delorie DOT com
Subject: Was: Re: Multitasking in DOS
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On Thu, 27 Jun 1996, Orlando Andico wrote:

Sorry for not answering before. I've been out of net.

> On Wed, 26 Jun 1996, Garrido Freire, Fco. Javier ((R)JA.GAR. SOFT) wrote:
> 
> > 	Of course, this's not enough, I know, to implement multitasking.
> > One of the most important things is to manage Input/Output devices.
> > There should be a lot to say just about this: keyboard, screen, disk,
> > memory, ... And functions: pipe, exec, dup, dup2, kill, getpid,
> > getpgrp, popen, exit, chdir, ... and surely fork and wait, :)
> 
> Multitasking under DOG ain't hard. And it ain't authentic. It's possible
> to write multithreaded programs using setjmp() and longjmp() -- and people
> have done that. 
I also tried setjmp()/longjmp() method with TURBO C, but
it didn't work. 
It probably was my fault.

> Your biggest problem is: the *&&%$%%^ non-reentrance of
> DOG itself (although the BIOS is more robust..) which precludes a
> multithreaded filesystem! what's "multitasking" without it? (although yes,
> I put my foot in my mouth, Minix doesn't have a multithreaded filesystem
> last I looked).
> 
The *&&%$%%^ non-reentrance of DOS shouldn't be a problem so big.
Synchronizing the access to the filesystem is a way. All the
scheduler has to do is wait until INT 21h System Call had
finished. Then save the answer and give CPU to another process
(Rendez-vous method?). The cons is that this could be slow.

Not only INT 21h is non-reentrant, INT 10h or whatever syscall
are. BWT, anybody saw my demo. I got 3 process (up to 10) running
in DOS 6.2 concurrently. No trick, no fake just synchronizing w/ some
ordinary undocumented DOS calls, :-)

> > 	Another good source of information is "Operating Sistems: Design
> > and Implementation" by Andrew S. Tanenbaum. He gets a much better,
> > authentic 'preentive' multitasking at a *8088*!!
> 
> That would be Minix.. Tanenbaum got into an argument with Linus Torvalds
> over that.. but why stop there? I don't know how far along Linux ELKS is
> (this is the version that will run on an 8088 and Z80) but if you're that,
> incredibly insane to want multitasking on an XT..
> 
That's right. Minix I meant. Tanenbaum got multitasking on an
8088. Then here you are. Obiously, on an 386's PM is easier. But,
there is where DJGPP starts to play. Just join the pieces. A lot
of that work is already done! A debugger can run a child. Why
can't a debugger run several children?
BWT, Minix used (slow) Rendez-vous method for didactical 
purposes.

> If you desperately want multitasking under something-like-DOG, check out
> the RSXWDK and RSXNT packages. I got these, but they don't seem to work
> with DJGPP v2 (written for 1.x and the OS/2 EMX-GCC). I've taken a look at
> the source, and DJGPP 1.x with the RSXNT libraries *does* support fork().
> You'd have to be running under Windog though.
> 
I'm still checking out aetsk102, jkthpack and looking for
ctask22.
I'll see it, too. Thanks for your comments.

PS: I enclose my demo attached

-------------------------------------------------------------------
F. Javier Garrido F.   (R)JA.GAR. SOFT    Dpto. de Computacion e IA
MINIX User. (USENET comp.os.minix & SCS)  Facultad de Informatica
Email: Francisco-Javier DOT Garrido AT cs DOT us DOT es  y Estadistica de Sevilla
URL: http://www.cs.us.es/~garridof                       (SPAIN)
"The light that burns twice as bright, burns half as long ...
   ... and you have burned so very, very brightly, Roy."
					  TYRREL from Blade Runner





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