Mail Archives: djgpp/1996/10/16/13:51:14
On Wed, 16 Oct 1996, Leath Muller wrote:
>> >The lwp package is a very simple time sliced multitasking library. It
>> >allows you to execute functions 'in the backround' without having to
>> >worry about multitasking. The package supports two of the PC's timers
>> >so that it will still work with other librarys that also use the timer.
>
>> Josh, will the library be able to handle several TASKS (i.e. real
>> applications) in the future. Do you intend to extend it to work as a simple
>> kernel for asynchronous execution of tasks?
>
>Here is food for thought: Is it possible to implement threads of this
>sort into csdpmi? If we could, then we would be able to run seperate
It's certainly possible. But you must remember that CWSDPMI is a very delicate
structure and I suppose that Charles is the only one who knows it good enough
to modify it (I once tried to add DPMI 1.0 services to it but all I achieved
is dead computer). Yet Charles says there won't be (probably) any further
releases of CWSDPMI... Maybe just a little guide over the code, Charls? ;-)
>programs, spawn them, have forks and semaphores, etc. csdpmi would be
>able to control the ldt's and what not for true multi-tasking. Mind
Sure, implementing it inside CWSDPMI would make things easier since it can run
some parts of code in ring 0 and this is required to do task switching in PM.
>you, we would be better off with this using the ELF format (geez, I
>hope I don't start this up again... :)
>
>What do you think? possible? (A lot of work in the smallest case... ;)
There's just another small 'but' here. Adding task switching capabilities to
CWSDPMI would mean making it into a small OS kernel. It'd be small if to look
at it as on an OS but as DPMI server it would be rather big. Well, I suppose
that 'with a little help of my friends' we could do it. Charls, would it be
very time-consuming for you to enlighten us as to obscure CWSDPMI internals?
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