The First Time a Thread Is Scheduled After Its Creation Does Not Run at the Expected Time (323461)


The information in this article applies to:

  • Microsoft Windows CE Platform Builder 4.0
  • Microsoft Windows CE .NET 4.0
This article was previously published under Q323461

SYMPTOMS

The first time a thread is scheduled after its creation, it may not run at the expected time. Any interrupt may cause a reschedule away from the thread to a thread of equal priority, even if the thread quantum has not expired.

CAUSE

The counter for thread quantum-time remaining is left set at 0 when a new thread is created.

RESOLUTION

A supported fix is now available from Microsoft as Windows CE Core OS QFE . To resolve this problem immediately, search for the keyword "QFE" on the following Microsoft Web site:

http://www.microsoft.com/downloads/

The English version of this package should have the following file attributes or later: 
   Size         File name
   -----------------------------------------------
   2,198,112    020607_armv4i_wce40-q323461.exe    
   2,181,728    020607_armv4t_wce40-q323461.exe    
   2,194,016    020607_armv4_wce40-q323461.exe    
   2,189,920    020607_mips16_wce40-q323461.exe    
   2,374,240    020607_mipsii_fp_wce40-q323461.exe
   4,299,360    020607_mipsii_wce40-q323461.exe    
   2,480,736    020607_mipsiv_fp_wce40-q323461.exe 
   2,357,856    020607_mipsiv_wce40-q323461.exe    
   2,030,176    020607_sh3_wce40-q323461.exe    
   2,054,752    020607_sh4_wce40-q323461.exe    
   1,911,392    020607_x86_wce40-q323461.exe
The English version of this fix has the file attributes (or later) that are listed in the following table. 
   Date       Time   Size       File name              Platform
   ------------------------------------------------------------------
   22-May-02  13:33  1,742,526  Nkmain.lib             armv4\debug
   22-May-02  13:33    110,592  Nkmain.pdb             armv4\debug
   22-May-02  13:33  1,853,274  Nkprmain.lib           armv4\debug
   22-May-02  13:33    110,592  Nkprmain.pdb           armv4\debug
   22-May-02  13:33  1,115,300  Nkmain.lib             armv4\retail
   22-May-02  13:33    110,592  Nkmain.pdb             armv4\retail
   22-May-02  13:33  1,207,304  Nkprmain.lib           armv4\retail
   22-May-02  13:33    110,592  Nkprmain.pdb           armv4\retail
   22-May-02  13:36  1,746,450  Nkmain.lib             armv4i\debug
   22-May-02  13:36    110,592  Nkmain.pdb             armv4i\debug
   22-May-02  13:36  1,857,448  Nkprmain.lib           armv4i\debug
   22-May-02  13:36    110,592  Nkprmain.pdb           armv4i\debug
   22-May-02  13:35  1,119,296  Nkmain.lib             armv4i\retail
   22-May-02  13:35    110,592  Nkmain.pdb             armv4i\retail
   22-May-02  13:36  1,211,578  Nkprmain.lib           armv4i\retail
   22-May-02  13:36    110,592  Nkprmain.pdb           armv4i\retail
   22-May-02  13:35  1,615,586  Nkmain.lib             armv4t\debug
   22-May-02  13:35    110,592  Nkmain.pdb             armv4t\debug
   22-May-02  13:35  1,719,422  Nkprmain.lib           armv4t\debug
   22-May-02  13:35    110,592  Nkprmain.pdb           armv4t\debug
   22-May-02  13:34  1,102,464  Nkmain.lib             armv4t\retail
   22-May-02  13:34    110,592  Nkmain.pdb             armv4t\retail
   22-May-02  13:34  1,193,190  Nkprmain.lib           armv4t\retail
   22-May-02  13:34    110,592  Nkprmain.pdb           armv4t\retail
   22-May-02  13:41  1,788,362  Nkmain.lib             mips16\debug
   22-May-02  13:41    110,592  Nkmain.pdb             mips16\debug
   22-May-02  13:41  1,909,850  Nkprmain.lib           mips16\debug
   22-May-02  13:41    110,592  Nkprmain.pdb           mips16\debug
   22-May-02  13:40    997,184  Nkmain.lib             mips16\retail
   22-May-02  13:40    110,592  Nkmain.pdb             mips16\retail
   22-May-02  13:41  1,093,568  Nkprmain.lib           mips16\retail
   22-May-02  13:40    110,592  Nkprmain.pdb           mips16\retail
   22-May-02  13:38  1,784,508  Nkmipsiibmain.lib      mipsii\debug
   22-May-02  13:38    110,592  Nkmipsiibmain.pdb      mipsii\debug
   22-May-02  13:38  1,786,188  Nkmipsiimain.lib       mipsii\debug
   22-May-02  13:38    110,592  Nkmipsiimain.pdb       mipsii\debug
   22-May-02  13:38  1,906,184  Nkprofmipsiibmain.lib  mipsii\debug
   22-May-02  13:38    110,592  Nkprofmipsiibmain.pdb  mipsii\debug
   22-May-02  13:38  1,907,864  Nkprofmipsiimain.lib   mipsii\debug
   22-May-02  13:38    110,592  Nkprofmipsiimain.pdb   mipsii\debug
   22-May-02  13:37  1,134,784  Nkmipsiibmain.lib      mipsii\retail
   22-May-02  13:37    110,592  Nkmipsiibmain.pdb      mipsii\retail
   22-May-02  13:37  1,136,634  Nkmipsiimain.lib       mipsii\retail
   22-May-02  13:37    110,592  Nkmipsiimain.pdb       mipsii\retail
   22-May-02  13:37  1,237,510  Nkprofmipsiibmain.lib  mipsii\retail
   22-May-02  13:37    110,592  Nkprofmipsiibmain.pdb  mipsii\retail
   22-May-02  13:37  1,239,362  Nkprofmipsiimain.lib   mipsii\retail
   22-May-02  13:37    110,592  Nkprofmipsiimain.pdb   mipsii\retail
   22-May-02  13:42  1,854,328  Nkmain.lib             mipsII_fp\debug
   22-May-02  13:42    110,592  Nkmain.pdb             mipsII_fp\debug
   22-May-02  13:43  1,976,020  Nkprmain.lib           mipsII_fp\debug
   22-May-02  13:43    118,784  Nkprmain.pdb           mipsII_fp\debug
   22-May-02  13:42  1,196,236  Nkmain.lib             mipsII_fp\retail
   22-May-02  13:42    110,592  Nkmain.pdb             mipsII_fp\retail
   22-May-02  13:42  1,299,070  Nkprmain.lib           mipsII_fp\retail
   22-May-02  13:42    118,784  Nkprmain.pdb           mipsII_fp\retail
   22-May-02  13:40  1,843,438  Nkmain.lib             mipsiv\debug
   22-May-02  13:40    110,592  Nkmain.pdb             mipsiv\debug
   22-May-02  13:40  1,967,962  Nkprmain.lib           mipsiv\debug
   22-May-02  13:40    110,592  Nkprmain.pdb           mipsiv\debug
   22-May-02  13:39  1,192,472  Nkmain.lib             mipsiv\retail
   22-May-02  13:39    110,592  Nkmain.pdb             mipsiv\retail
   22-May-02  13:39  1,298,594  Nkprmain.lib           mipsiv\retail
   22-May-02  13:39    110,592  Nkprmain.pdb           mipsiv\retail
   22-May-02  13:44  1,919,304  Nkmain.lib             mipsiv_fp\debug
   22-May-02  13:44    110,592  Nkmain.pdb             mipsiv_fp\debug
   22-May-02  13:44  2,043,850  Nkprmain.lib           mipsiv_fp\debug
   22-May-02  13:44    118,784  Nkprmain.pdb           mipsiv_fp\debug
   22-May-02  13:43  1,260,668  Nkmain.lib             mipsiv_fp\retail
   22-May-02  13:43    110,592  Nkmain.pdb             mipsiv_fp\retail
   22-May-02  13:43  1,366,844  Nkprmain.lib           mipsiv_fp\retail
   22-May-02  13:43    118,784  Nkprmain.pdb           mipsiv_fp\retail
   22-May-02  13:31  1,449,756  Nkmain.lib             sh3\debug
   22-May-02  13:31    110,592  Nkmain.pdb             sh3\debug
   22-May-02  13:31  1,547,904  Nkprmain.lib           sh3\debug
   22-May-02  13:31    110,592  Nkprmain.pdb           sh3\debug
   22-May-02  13:30    973,798  Nkmain.lib             sh3\retail
   22-May-02  13:30    102,400  Nkmain.pdb             sh3\retail
   22-May-02  13:30  1,064,472  Nkprmain.lib           sh3\retail
   22-May-02  13:30    110,592  Nkprmain.pdb           sh3\retail
   22-May-02  13:32  1,468,026  Nkmain.lib             sh4\debug
   22-May-02  13:32    102,400  Nkmain.pdb             sh4\debug
   22-May-02  13:32  1,566,184  Nkprmain.lib           sh4\debug
   22-May-02  13:32    110,592  Nkprmain.pdb           sh4\debug
   22-May-02  13:31    991,102  Nkmain.lib             sh4\retail
   22-May-02  13:31    102,400  Nkmain.pdb             sh4\retail
   22-May-02  13:32  1,081,838  Nkprmain.lib           sh4\retail
   22-May-02  13:32    110,592  Nkprmain.pdb           sh4\retail
   22-May-02  13:29  1,477,360  Nkmain.lib             x86\debug
   22-May-02  13:29    110,592  Nkmain.pdb             x86\debug
   22-May-02  13:29  1,575,244  Nkprmain.lib           x86\debug
   22-May-02  13:29    110,592  Nkprmain.pdb           x86\debug
   22-May-02  13:29    953,550  Nkmain.lib             x86\retail
   22-May-02  13:29    110,592  Nkmain.pdb             x86\retail
   22-May-02  13:29  1,037,082  Nkprmain.lib           x86\retail
   22-May-02  13:29    110,592  Nkprmain.pdb           x86\retail

MORE INFORMATION

For each thread, the Windows CE operating system maintains a counter for thread quantum remaining. When the counter reaches 0, the quantum time is expired, and other threads of equal priority may be scheduled. When a new thread is created, the counter is incorrectly left set to 0, which means that the thread is immediately subject to reschedule. After the reschedule is complete, the counter is reset to the default quantum, and future thread scheduling proceeds.

This QFE changes the kernel's thread-creation code to set the value of the thread quantum remaining equal to the default thread quantum, so that when the thread is scheduled for the very first time, it can use a full thread quantum.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
Modification Type:MinorLast Reviewed:6/30/2005
Keywords:kbbug kbenv kbfix kbQFE KB323461
©2004 Microsoft Corporation. All rights reserved.