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Date: Sun, 03 Oct 2004 11:03:40 +1000
From: Ross Higson <rosshigson_REMOVE_ME_@optusnet.com.au>
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Subject: Re: Why do the escape sequences not work?
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Date: 2004-10-03T11:03:40+10:00
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Brian May wrote:

> 
> On a related topic, anyone know how Windows sets priorities on
> applications?
> 
> I have a command line application (Ada of course), run in a MS console
> window. It is a daemon, so is meant to run in the background, without
> any user access required.
> 
> However, I have been getting complaints that it stops working if the
> window isn't visible (e.g. covered by another window). If another
> window pops up in front of it, it stops working. Also power save mode
> on the monitor stops it working (or was that the screen saver?). The
> confusing part is that sometimes it does work.
> 
> I haven't seen the problem, and can't reproduce it on Windows XP (the
> computer in question is Windows 2000 IIRC).
> 
> My theory is that MS-Windows reduces the priority of the task if the
> window is not visible on the assumption that the user doesn't need to
> interact with Windows they can't see.
> 
> I have a suspicion that using rxvt might solve the problem (and will
> check this ASAP), but I don't know how priorities are set on Windows.

Brian,

Under NT/2000 the current fg process may indeed get a priority boost 
that can cause bg processes to slow down. I don't think using rxvt will 
help, but this behaviour can be disabled. It doesn't happen under XP.

See http://www.winguides.com/registry/display.php/877/

Ross.