FIX: The CoUninitialize function is not thread-safe in a multithreaded environment (331260)
The information in this article applies to:
- Microsoft COM+ 1.0, when used with:
- the operating system: Microsoft Windows 2000
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. CAUSEWhen 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 in DLL A.
- The global variable in DLL A references an address in the unloaded DLL B that is no longer valid.
RESOLUTIONHow to Obtain the HotfixThis 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 STATUSMicrosoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section of this article.
| Modification Type: | Minor | Last Reviewed: | 11/8/2004 |
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| Keywords: | kbWin2000preSP5fix kbbug kbfix kbQFE kbWin2000preSP4Fix KB331260 kbAudDeveloper |
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