FIX: MFC Application Hangs on Multiprocessor Machine
Article ID: 167693
Article Last Modified on 11/21/2006
APPLIES TO
- Microsoft Foundation Class Library 4.2, when used with:
- Microsoft Visual C++ 5.0 Enterprise Edition
- Microsoft Visual C++ 5.0 Professional Edition
This article was previously published under Q167693
SYMPTOMS
When you run some multithreaded MFC applications, the computer may hang if
threads are created and terminated very quickly. This is most likely to
happen when the application is run on high-performance multiprocessor
computers (4+ processors at 200+ MHz). However, this problem could occur on
any machine. This problem only occurs when you use the DLL version of MFC.
CAUSE
MFC maintains a global list of thread local storage (TLS). As threads are
created and terminated, MFC adds or removes a node of TLS tracking
information to this list. This list is not protected from simultaneous
thread access and under the conditions described above, corruption of this
list can occur.
STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed
at the beginning of this article. This bug has been corrected in Visual
Studio 97 Service Pack 1.
For additional information about the Visual Studio 97 Service Pack 1,
please see the following article in the Microsoft Knowledge Base:
170365
INFO: Visual Studio 97 Service Packs - What, Where, and Why
Additional query words: Multithread hang multiprocessor
Keywords: kbbug kbfix kbnoupdate kbthread kbvs97sp1fix KB167693