DOCUMENT:Q170288 13-JUN-2001 [sna] TITLE :CMWAIT Returns Incorrectly After Canceling CMALLC PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:2.11,2.11 SP1,2.11 SP2,3.0,3.0 SP1 OPER/SYS: KEYWORDS:kbnetwork kbprogramming ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 2.11, 2.11 SP1, 2.11 SP2, 3.0, 3.0 SP1 ------------------------------------------------------------------------------- SYMPTOMS ======== When you use the SNA Server Win32 asynchronous CPIC interface, a CPIC application may encounter problems when you cancell an Allocate (CMALLC) call with Cancel_Conversation (CMCANC). After you cancel a CMALLC using CMCANC, subsequent attempts to issue CMALLC in non-blocking mode appear to show that CMWAIT returns immediately, without waiting for the CMALLC async final completion. CAUSE ===== Canceling an asynchronous CPI-C call (not ones that would complete by posting a Windows message) does not work correctly. Later CMWAITs return early because they pick up false completions from the cancelled calls. STATUS ====== Microsoft has confirmed this to be a problem in SNA Server versions 2.11, 2.11 Service Pack 1 (SP1), 2.11 Service Pack 2 (SP2), 3.0, and 3.0 Service Pack 1 (SP1). This problem was corrected in the latest SNA Server version 3.0 U.S. Service Pack. For information on obtaining this Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): S E R V P A C K A supported fix for SNA Server version 2.11 is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information. MORE INFORMATION ================ The following sequence was observed in an SNA Application CPIC API trace: CMINIT -> <- CMINIT OK CMSPM (set non-blocking mode) <- CMSPM OK CMALLC -> <- CMALLC (operation incomplete) CMCANC -> <- CMALLC (allocation_failure_no_retry) <- CMCANC OK CMINIT -> <- CMINIT OK CMSPM (set non-blocking mode) -> <- CMSPM OK CMALLC -> <- CMALLC (operation incomplete) CMWAIT -> <- CMWAIT OK CMDEAL -> <- CMDEAL (error = state_check) <- CMALLC OK Additional query words: ====================================================================== Keywords : kbnetwork kbprogramming Technology : kbAudDeveloper kbSNAServSearch kbSNAServ300 kbSNAServ211 kbSNAServ211SP1 kbSNAServ211SP2 kbSNAServ300SP1 Version : WINDOWS:2.11,2.11 SP1,2.11 SP2,3.0,3.0 SP1 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.