From:	"Alexei A. Frounze" <alex DOT fru AT mtu-net DOT ru>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: 3rd Try: Maybe an asm problem? (Problems linking)
Date:	Mon, 01 May 2000 21:29:14 +0400
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Gautier wrote:
> 
> > > __dpmi_yield is not for task switching, it's for releasing the current
> > > time slice allotted by Windows (or any other multi-tasking scheduler).
> 
> Alexei:
> 
> > Just some kind of a synonym. :)
> 
> Sorry to contradict, but the "task switching" jargon is for the user
> choosing manually and delibarately a task to be foreground of his/her display.
> It's rather an antonym!

Sure I know difference current task for an OS and current task for a user. :)

If a task/thread/process/whatever switch occurs after releasing the timeslice,
is that antonym?

> > Do you bother about that while you're programming? I.e. do you write a custom
> > keyboard read function that calls that thing?
> 
> In an OO environment that provides events like Turbovision, it suffices to
> put a call to the "Release time slice" for the "idle event" case!

I know that, if .HandleEvent(Event) encounters a null/empty Event
(Event.What=evNothing or something like that) it calls .Idle. Parhaps TV has
that call to Int 2f in the deeppest Idle procedure.

> > Or maybe we all develop applications for background that should work and be
> > invisible? I dboubt. :)
> 
> Inexact: that "Release time slice" can act when your program is at foreground
> and visible. It helps the background tasks to run faster!

May be.

> > How about old DOS programs? Are you sure all they release timeslice?
> 
> Surely that if you unassemble a commercial DOS app. (e.g. DOS interactive
> commands) you'll find plenty of them...

*Commercial*... :)


bye.
Alexei A. Frounze
-----------------------------------------
Homepage: http://alexfru.chat.ru
Mirror:   http://members.xoom.com/alexfru

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