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OpenVMS VMS731_PTHREAD-V0100 Alpha V7.3-1 PTHREAD ECO Summary
TITLE: OpenVMS VMS731_PTHREAD-V0100 Alpha V7.3-1 PTHREAD ECO Summary
NOTE:  An OpenVMS saveset or PCSI installation file is stored
       on the Internet in a self-expanding compressed file.
       For OpenVMS savesets, the name of the compressed saveset
       file will be kit_name.a-dcx_vaxexe for OpenVMS VAX or
       kit_name.a-dcx_axpexe for OpenVMS Alpha. Once the OpenVMS
       saveset is copied to your system, expand the compressed
       saveset by typing RUN kitname.dcx_vaxexe or kitname.dcx_alpexe.
       For PCSI files, once the PCSI file is copied to your system,
       rename the PCSI file to kitname.pcsi-dcx_axpexe or
       kitname.pcsi-dcx_vaxexe, then it can be expanded by typing
       RUN kitname.pcsi-dcx_axpexe or kitname.pcsi-dcx_vaxexe.  The
       resultant file will be the PCSI installation file which can be
       used to install the ECO.

New Kit Date:       31-JAN-2003
Modification Date:  Not Applicable
Modification Type:  NEW KIT

Copyright (c) Compaq Computer Corporation 2002,2003.  All rights reserved.

OP/SYS:     OpenVMS Alpha


SOURCE:     Compaq Computer Corporation


     ECO Kit Name:  VMS731_PTHREAD-V0100
     ECO Kits Superseded by This ECO Kit:  None
     ECO Kit Approximate Size:  1616 Blocks
     Kit Applies To:  OpenVMS Alpha V7.3-1
     System/Cluster Reboot Necessary:  No
     Rolling Re-boot Supported:  Information Not Available
     Installation Rating:  INSTALL_3
                            3 - To  be  installed  by  customers  
                                experiencing the problems corrected.
     Kit Dependencies:

       The following remedial kit(s), or later, must be installed BEFORE
       installation of this kit:


       In order to receive all the corrections listed in this
       kit, the following remedial kits should also be installed:



An ECO kit exists for PTHREAD on OpenVMS Alpha V7.3-1.  This kit addresses the 
following problems: 


     o  There is a window between the setting of the initial thread's
        state to ready, but before it has been inserted into the list
        of ready threads.  If the initial thread returns from
        servicing ASTs during this window and that return is to a
        point where the initial thread is waiting on a
        still-outstanding condition variable wait operation, the
        thread's state may be set to BLOCKED.  When the attempt is
        then made to insert the thread into the ready queue, a
        bugcheck results.  This problem may affect applications with
        upcalls enabled.

        This change removes calls to do undeferrals at the point in
        the code path when this window occurs.

        Bugcheck Extract:

        DECthreads bugcheck (version T3.19-044), terminating execution.
        % Reason:  selected a non-ready thread 1 (0x7BC94888), state 1

          Images Affected:[SYSLIB]PTHREAD$DBGSHR.EXE

     o  On multi-processor systems, the EXEC uses the Inner-Mode
        Semaphore (IMS) to serialize execution of many system
        services.  Upcalls are used to allow the threads library to
        execute one thread while another is blocked waiting for the
        IMS.  The services which the threads library uses to switch
        threads are themselves users of the IMS.  Under certain
        conditions, the result is recursion of IMS-free upcalls.  If
        the recursion persists long enough, a stack overflow can occur
        in a null thread which terminates the process.  This can only
        happen on a multiprocessor system when use of upcalls and
        multiple kernel threads are enabled.

          Images Affected:[SYSLIB]PTHREAD$DBGSHR.EXE

     o  Under certain conditions, if an application AST arrives while
        the Java garbage collector is running a process hang can
        occur.  The problem is that the threads library uses the
        default thread to service the AST (when upcalls are enabled,
        which Java requires).  If garbage collection is happening at
        the same time, the default thread can be left in an incorrect
        state, causing a hang.  With this fix, AST delivery is now
        deferred while the garbage collector is running.

          Images Affected:[SYSLIB]PTHREAD$DBGSHR.EXE

     o  A bug in the way DECthreads responded to topology changes (CPU
        stop or start) could have caused a threaded application to
        hang on a system with multiple kernel threads enabled.

          Images Affected:[SYSLIB]PTHREAD$DBGSHR.EXE


No reboot is necessary after successful installation of the kit.


Install this kit with the POLYCENTER Software installation utility
by logging into the SYSTEM account, and typing the following at the
DCL prompt:


The kit location may be a tape drive, CD, or a disk directory that
contains the kit.

Additional help on installing PCSI kits can be found by typing
HELP PRODUCT INSTALL at the system prompt

Special Installation Instructions:

     o  Scripting of Answers to Installation Questions

        During installation, this kit will ask and require user
        response to several questions.  If you wish to automate the
        installation of this kit and avoid having to provide responses
        to these questions, you must create a DCL command procedure
        that includes the following definitions and commands:


           -  Add the following qualifiers to the PRODUCT INSTALL
              command and add that command to the DCL procedure.


           -  De-assign the logicals assigned

        For example, a sample command file to install the
        VMS731_PTHREAD-V0100 kit would be:

          $ exit

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