Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!shum.Huji.AC.IL!oferf
From: oferf@shum.Huji.AC.IL (ofer faigon)
Newsgroups: comp.windows.ms
Subject: Process priorities in win386 ?
Summary: How can a forground process yield to a background one?
Message-ID: <351@shuldig.huji.ac.il>
Date: 6 Jun 89 00:35:47 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: oferf%shum.UUCP@humus.Huji.AC.IL (ofer faigon)
Organization: Hebrew University of Jerusalem, ISRAEL
Lines: 36

Hello,
   I have a problem regarding process priorities in Windows/386:

I have two programs - one is a Windows aplication (W), the other a DOS
application (D).  I want to run them together, with W visible and
covering the whole screen and D in the background.
At certain times (T) D has to get all or most of the CPU cycles,
without popping into view.

I tried using several methods:
1 - use the 386 API function, whose description I found in Online,
    to terminate the current time-slice every time W gets the CPU
    during T.
2 - call SetPriority(GetProcessId(),...) in W at the beginning/end of T.
3 - call WaitMessage in W during T.
4 - use Yield().

(1), (3) and (4) seem to be doing absolutely nothing, based on run time
measurements.
(2) hangs the machine - no response to mouse or keyboard events. I
played with this a little and found that the hanging occurs whenever there
is ANY DOS applic in the bacground, but not when there are only Windows
applics.

I am using the run-time environment of Windows/386 2.11, but W is linked
with the library of an older SDK (I don't have it here now; I think it is
ver 2.1)

What can I do?

Thanks, Ofer.

P.S. I do not have easy access to Online; Please do not send me there...
- Ofer Faigon                                         TEL: +972-2-669-834
  MAIL: P.O.B 7347, Jerusalem 91072, ISRAEL
  BITNET: oferf@HUJINIX         CSNET & INTERNET: oferf@shum.huji.ac.il