Article ID: 331260
Article Last Modified on 11/8/2004
APPLIES TO
- Microsoft COM+ 1.0, when used with:
- Microsoft Windows 2000 Standard Edition
This article was previously published under Q331260
SYMPTOMS
When one Microsoft Component Object Model (COM) DLL (DLL A) has a global variable references COM object in another COM DLL (DLL B), if these two DLLs are loaded and then unloaded in a multithreaded fashion, an access violation may occur.
CAUSE
When the last COM apartment in a process calls the CoUninitialize function, all DLLs that are loaded by COM will be unloaded. An access violation will occur if the following events occur:
- COM unloads
DLL B. - While COM unloads
DLL A, a new thread/apartment is started that references the global variable inDLL A. - The global variable in
DLL Areferences an address in the unloadedDLL Bthat is no longer valid.
RESOLUTION
How to Obtain the Hotfix
This issue is fixed in the Microsoft Windows 2000 Server COM+ 1.0 Hotfix Package 24. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
810578 Availability of Windows 2000 Post-Service Pack 3 COM+ Hotfix Rollup Package 24
STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section of this article.
Additional query words: kbWin2000preSP4COMRollup24Fix multi-threaded
Keywords: kbwin2000presp5fix kbbug kbfix kbqfe kbwin2000presp4fix KB331260
