Article ID: 193509 - View products that this article applies to.
This article was previously published under Q193509
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Multithreaded applications may experience exceptions or incorrect results when calling the C run-time library (CRT) strftime() function. This behavior is particularly prevalent on multiprocessor machines.
The strftime() function is dependent on an internal pointer for locale- related information that is necessary for formatting time and date strings. This pointer is used, and can be modified, by other components of the CRT, but is not protected for exclusive use within the strftime() function. This allows other threads to modify the pointer while strftime() is using it.
The internal pointer is modified when calling the setlocale() CRT function. To prevent the pointer from being inadvertently modified while being used, use one of the following two workarounds:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
This bug has been fixed in the Visual Studio 6.0 Service Pack 1. To obtain this service pack, please see:
http://msdn2.microsoft.com/en-us/vstudio/Aa718362.aspxFor more information on the Visual Studio 6.0 Service Pack 1, please see the following articles in the Microsoft Knowledge Base:
193009 INFO: Visual Studio 6.0 Service Pack 1 Readme
194022 INFO: Visual Studio 6.0 Service Pack 1 What, Where, Why
194295 HOWTO: Tell that Visual Studio 6.0 Service Packs Are Installed
The following sample program reproduces an exception. For multiprocessor systems, the problem occurs almost immediately: