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From:	juels AT kom DOT auc DOT dk (Soeren Juelsgaard)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: fork()/join()
Date:	02 Jun 1995 18:27:35 GMT
Organization:	Aalborg University, Dept. of Communication Technology
Lines:	56
References:	<3qhk5s$tvn AT news DOT telebyte DOT com> <D9H1Mq DOT 7HG AT cunews DOT carleton DOT ca> <3qlh05$kcn AT odin DOT diku DOT dk>
Nntp-Posting-Host:	aleko.kom.auc.dk
To:	djgpp AT sun DOT soe DOT clarkson DOT edu

>>>>> "Morten" == Morten Welinder <terra AT diku DOT dk> writes:
In article <3qlh05$kcn AT odin DOT diku DOT dk> terra AT diku DOT dk (Morten Welinder) writes:


>> Joel Hunter (jhunter AT kendaco DOT telebyte DOT com) wrote: : Will DJGPP EVER
>> support these functions?  Does anyone care but me : whether it does
>> or not?  We've got the hardware, so why not do it?

Morten> Excuse me first for being a little direct: have you
Morten> contributed to djgpp lately?  Why don't you grab the latest
Morten> djgpp alpha test and add fork()?  [join???]  Next week is
Morten> fine.

Morten> Regarding having the hardware: so does a Commodore 64.  What's
Morten> your point?

Morten> And now to the point: I have some notes that describe how you
Morten> could do some kind of fake multitasking with fork() etc. using
Morten> djgpp V2.  "Fake" means that the process switch will be at
Morten> certain software events like (e.g.) calls to __dpmi_int.
Morten> Don't expect non-djgpp programs to integrate smoothly (or at
Morten> all) with this.

Morten> fork(), btw, is going to be a pig since it will have to copy
Morten> the entire running process.  The multi-tasking exec's will
Morten> behave much better.

Morten> I guess you want pipes also.  Do you know how many places you
Morten> need to add code specifically for pipe handles?  Be very
Morten> afraid.

Morten> I don't know when I'll get the time.  Don't expect it this
Morten> this year.



Morten> csaldanh AT mae DOT carleton DOT ca (Chris Saldanha) writes:

>> fork() is not a function, but a system call from the OS.

>> MSDOS does not support any advanced systems calls like fork(),
>> because of its antiquated architecture. DJGPP is not an operating
>> system, only a development environment... :(

Morten> Hasn't stopped us before.

Morten> Morten


Well Morten theres no idea of inventing the wheel again, and you can
allready get OS's running GCC/G++ on Intel platforms, there will
support system calls like exec and fork. Both OS/2 and Linux will do
this and there's multithreaded librarys for them as well, giving you
all the joy you can think of :-)

Sincerely Soeren Juelsgaard

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