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DOCUMENT:Q103048 08-SEP-1993 [W_NT]
TITLE :CPU-Bound Applications and Windows NT
PRODUCT :Windows NT
PROD/VER:3.10
OPER/SYS:WINDOWS
KEYWORDS:
--------------------------------------------------------------------
The information in this article applies to:
- Microsoft Windows NT operating system version 3.1
- Microsoft Windows NT Advanced Server version 3.1
--------------------------------------------------------------------
Because the Windows NT screen savers run at a lower priority than
applications with Windows NT, it is possible for a CPU-bound
application to make the system inoperable.
A CPU-bound application is an application that constantly interrupts
the processor in case there is data to be processed. An example of a
CPU-bound application is the Slide Show in Microsoft PowerPoint.
If the Windows NT screen saver activates while the CPU-bound
application is in the foreground, the screen saver thread will
essentially become starved for CPU cycles because other applications
run at a higher priority. Depending on how the CPU-bound application
is written, keystrokes and/or mouse movements may not be passed on to
the functioning Windows NT screen saver application. If they are not,
the computer is essentially locked up.
By default, the screen saver runs at a base priority of 4 and
applications run at a base priority of 7.
The only current workaround for this is to disable the screen saver.
Additional reference words: 3.10
KBCategory:
KBSubCategory: winnt
=============================================================================
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.
Copyright Microsoft Corporation 1993.