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Q248498: Win32 CPIC Application May Stop Unexpectedly

Article: Q248498
Product(s): Microsoft SNA Server
Version(s): 4.0,4.0 SP1,4.0 SP2,4.0 SP3
Operating System(s): 
Keyword(s): kbSNA400sp4fix kbSNA400PreSP4fix
Last Modified: 08-MAY-2002

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 
- Microsoft Host Integration Server 2000 
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SYMPTOMS
========

If a Win32 CPIC application is supporting multiple conversations using
non-blocking mode, the application may stop unexpectedly while issuing a new
CMINIT (Initialize_Conversation).

CAUSE
=====

Under certain circumstances, the Win32 CPIC and APPC libraries can get into a
deadlock condition. Note that the CPIC library (Wcpic32.dll) communicates
through the APPC library (Wappc32.dll). The deadlock can occur under the
following circumstances:

- When CMINIT issues a TP_STARTED while holding an internal CPIC critical
  section. If another APPC verb completes asynchronously while the TP_STARTED
  is running, the CPIC application may deadlock.


- When the CPIC library calls into WinAPPCCancelConversation() while holding
  the internal CPIC critical section. The thread that makes this call
  immediately blocks while trying to obtain the APPC critical section, which is
  held by the APPC callback thread, which is waiting for CPIC lock.


RESOLUTION
==========

To resolve this problem, obtain the latest service pack for SNA Server 4.0. For
additional information, please see the following article in the Microsoft
Knowledge Base:

  Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack



Host Integration Server 2000:

A supported fix is now available from Microsoft, but it is only intended to
correct the problem described in this article and should be applied only to
systems experiencing this specific problem. This fix may receive additional
testing at a later time, to further ensure product quality. Therefore, if you
are not severely affected by this problem, Microsoft recommends that you wait
for the next Host Integration Server (HIS) 2000 Service Pack that contains this
fix.

To resolve this problem immediately, contact Microsoft Product Support Services
to obtain the fix. For a complete list of Microsoft Product Support Services
phone numbers and information about support costs, please go to the following
address on the World Wide Web:

  http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal support costs will apply to additional
support questions and issues that do not qualify for the specific update in
question.

The English version of this fix should have the following file attributes or
later:

+------------------------------------+
| File name   | Date       | Time    | 
+------------------------------------+
| Wcpic32.dll | 01/02/2001 | 10:06am | 
+------------------------------------+

NOTE: Because of file dependencies, the most recent fix that contains the above
files may also contain additional files.



STATUS
======

Microsoft has confirmed this to be a problem in Microsoft SNA Server version
4.0, 4.0 SP1, 4.0 SP2 and 4.0 SP3.

This problem was first corrected in SNA Server 4.0 Service Pack 4.

Microsoft has confirmed this to be a problem in Microsoft Host Integration Server
2000.

Additional query words:

======================================================================
Keywords          : kbSNA400sp4fix kbSNA400PreSP4fix 
Technology        : kbAudDeveloper kbSNAServSearch kbHostIntegServ2000 kbSNAServ400 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3
Version           : :4.0,4.0 SP1,4.0 SP2,4.0 SP3
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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