home *** CD-ROM | disk | FTP | other *** search
- 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.