Re: Maximum User Handles Per Process Is 10,000 in Windows 2000

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From: Gary Chanson (gchanson_at_No.Spam.TheWorld.net)
Date: 03/04/04 

Date: Thu, 4 Mar 2004 05:58:48 -0500

"Francois Piette" <francois.piette@overbyte.be> wrote in message
news:40470a96$0$254$4d4efb8e@read.news.be.uu.net...
> I have a program that is impaired by the limit of 10000 window handles
> imposed by W2K. This program use hidden windows for message processing and
> stop working in high load because of this limit.
>
> This limit is known
(http://support.microsoft.com/default.aspx?kbid=326591)
> but can be changes with a registry key. Unfortunately this doesn't work on
> my Win-2K-Server-SP4 ! I have changed the limit from 10000 to 20000 in the
> keys:
> HKLM\Software\Microsoft\Windows
> NT\CurrentVersion\Windows\USERProcessHandleQuota
> and HKLM\Software\Microsoft\Windows
> NT\CurrentVersion\Windows\GDIProcessHandleQuota but this has no effect,
even
> after rebooting the server.
>
> What should I do ?

    Fix your program so that it doesn't overflow the message queue. You can
either use PeekMessage to pump messages interleaved with whatever processing
you're doing or better, use a separate thread for your processing so that
you can run a normal GetMessage based message pump. Don't tie up your
message pump thread by doing lengthy processing within message handlers. 

-- 
-GJC [MS Windows SDK MVP]
-Software Consultant (Embedded systems and Real Time Controls)
- http://www.mvps.org/ArcaneIncantations/consulting.htm
-gchanson@mvps.org

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