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MF66320 - LIC-DB-OTHER MSGCPF5032 INTERMITTENT LOCK TIME-OUT IN MULTI-

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PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-DB-OTHER MSGCPF5032 INTERMITTENT LOCK TIME-OUT IN MULTI-


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
CO   5770999  V7R2M0    MF66321   00/00    0000



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-------
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APAR Error Description / Circumvention

-----------------------------------------------
_Rlocate() C function does not return when record lock is
available in threaded application.
A threaded application uses multiple threads to open the same db
member, with each thread using a different handle from different
_Ropen calls. The files are opened under a common commit block.
If Thread 1 calls _Rlocate() and locks a record, and then Thread
2 calls _Rlocate to lock the same record, Thread 2 waits as it
should. However, when Thread 1 performs an update or delete on
the record, Thread 2 is not granted the lock. The lock is being
transferred to the commit block, but other threads waiting for
the lock are not granted the lock. If thread 2 had instead
called _Rlocate AFTER Thread 1 had done its update or delete,
then thread 2 would be immediately granted the lock.

CORRECTION FOR APAR MA47790 :
-----------------------------
When a thread fails to acquire an update lock that is held by
another thread in the same process, the code was changed to wait
until the holding thread makes the lock available for borrowing.
This reduces the likelihood of an update lock conflict with
another thread in the same process.

CIRCUMVENTION FOR APAR MA47790 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
     NONE

Summary Information

System..............................i
Models..............................
Release.............................V7R2M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA47790
Superseded by:......................
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C9297720


IBM i Support

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Document Information

Modified date:
08 July 2019