Microsoft KB Archive/262290

= Deadlock in TAPI Service If the Provider Is Not Re-entrant =

Article ID: 262290

Article Last Modified on 2/21/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition

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This article was previously published under Q262290



SYMPTOMS
When a program makes a call to the Telephony application programming interface (TAPI) lineClose function, CPU usage may rise to 100 percent if the provider is not re-entrant.



CAUSE
This behavior is caused by a deadlock condition that may occur in the TAPI service. It occurs only with providers that are not re-entrant.

This behavior may occur if the following items occur in quick succession in the listed order:
 * The provider signals a new call on a particular line, by using LINE_NEWCALL.
 * The program closes the line by making a call to lineClose.
 * The provider sends the first LINE_CALLSTATE message for the new call.

When this occurs, a deadlock may occur in the TAPI service.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English version of this fix should have the following file attributes or later:   Date        Time    Version        Size      File name ---  05/06/2000  04:02p  5.0.2195.2085  173,328  Tapisrv.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 2.

Keywords: kbhotfixserver kbqfe kbbug kbfix kbwin2000presp2fix KB262290

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