Re: Ask yourself these before you choosing a 32bit OS...

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Article #1499

#1499

From: Jay Urbanski
Date: Tue, 22 Aug 1995 00:51

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c2a192@ugrad.cs.ubc.ca (Kazimir Kylheku) wrote:

[snip]

>But these systems can't do that. If I write a loop that doesn't
>explicitly call a yield routine, only my task will execute. There is

Nope.  Even Windows 3.0 pre-emptively multi-tasked DOS sessions.  How does
one have a DOS program call a yield routine anyways?   I'm not saying it
did it particularly well, but it did do it.  With windows programs, you are
correct it is cooperative multi-tasking and the program must yield.

>no hint of concurrency in that at all, since each program has to invoke
>another with an explicit call.  Multitasking means that you at least
>simulate concurrency using time slicing. It means that other tasks are
>truly running whether or not my program yields. It means that I
>can send signals and messages to that program from another program.

And Windows does do that with DOS sessions.   Make a simple batch file that
does a directory listing, then calls itself.   Open two DOS sessions, watch
them both scroll by simultaneously.

-Jay
MCSE
Mobile Systems International

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Path: arc1-ca.pugleaf.net!dfw.nkn.net!usenet
From: strops@fastlane.net (Jay Urbanski)
Newsgroups: comp.sys.powerpc,comp.os.linux.advocacy,comp.sys.mac.advocacy,comp.os.os2.advocacy,comp.sys.amiga.advocacy,comp.sys.intel,alt.2600,comp.os.ms-windows.advocacy
Subject: Re: Ask yourself these before you choosing a 32bit OS...
Date: Tue, 22 Aug 1995 00:51:47 GMT
Organization: Mobile Systems International
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