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OpenVMS VMS712_PTHREADS-V0300 DECthreads Alpha V7.1-2 ECO Summary
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TITLE: OpenVMS VMS712_PTHREADS-V0300 DECthreads Alpha V7.1-2 ECO Summary
Modification Date: 28-SEP-1999
Modification Type: Updated Kit: Supersedes VMS712_PTHREADS02-V0100
NOTE: An OpenVMS saveset or PCSI installation file is stored
on the Internet in a self-expanding compressed file.
The name of the compressed file will be kit_name-dcx_vaxexe
for OpenVMS VAX or kit_name-dcx_axpexe for OpenVMS Alpha.
Once the file is copied to your system, it can be expanded
by typing RUN compressed_file. The resultant file will
be the OpenVMS saveset or PCSI installation file which
can be used to install the ECO.
Copyright (c) Compaq Computer Corporation 1999. All rights reserved.
OP/SYS: OpenVMS Alpha
COMPONENT: DECthreads
SOURCE: Compaq Computer Corporation
ECO INFORMATION:
ECO Kit Name: VMS712_PTHREADS-V0300
DEC-AXPVMS-VMS712_PTHREADS-V0300--4.PCSI
ECO Kits Superseded by This ECO Kit: VMS712_PTHREADS02
DEC-AXPVMS-VMS712_PTHREADS02-V0100--4.PCSI
VMS712_PTHREADS-V0100
DEC-AXPVMS-VMS712_PTHREADS-V0100--4.PCSI
ECO Kit Approximate Size: 7024 Blocks
Kit Applies To: OpenVMS Alpha V7.1-2
System/Cluster Reboot Necessary: Yes
Rolling Re-boot Supported: Yes - See Installation Notes
Installation Rating: INSTALL_3
3 - To be installed on all systems running
the listed versions of OpenVMS which
are experiencing the problems described.
Note: Users of MMOV should NOT
install this kit. See Problem Descriptions
for more information.
Kit Dependencies:
The following remedial kit(s) must be installed BEFORE
installation of this kit:
If the VMS712_PTHREADS-V0100 or VMS712_PTHREADS02-V0100
kit has been installed, you must install the
VMS712_PTHREADS_DB-V0100 remedial kit to resolve a PCSI
database issue prior to installing this kit.
In order to receive all the corrections listed in this
kit, the following remedial kits should also be installed:
None
ECO KIT SUMMARY:
An ECO kit exists for PTHREADS in DECthreads on OpenVMS Alpha V7.1-2.
This kit addresses the following problems:
Problems Addressed in VMS712_PTHREADS-V0300:
o The VMS712_PTHREADS02-V0100 kit contained a race condition
when upcalls were disabled which could result in a hang with
the manager thread ready to run, but not running. Instead,
the null thread is running. This problem was primarily seen
with Ada programs that used certain TEXT_IO functions, and
has been corrected.
o The DECthreads library was modified to correct a race
condition that could result in reduced performance or
application hangs. The problem occurred when threads
in the READY state would fail to run, due to a missed
wakeup on a quiescent VP.
o Modifications were made to the DECthreads library to correct
the following problems
+ When upcalls are enabled, the exit handling thread is now
created with a stack size compatible with the default size
used in previous releases. This avoids stack overflows
when running legacy exit handlers that require more stack
space than was previously allocated.
+ Under certain circumstances, when a thread called
pthread_exit(), instead of simply terminating the calling
thread, the entire process would be incorrectly terminated
with a %CMA-F-EXIT_THREAD error.
+ Pagefault completions would accumulate with the
corresponding waiting threads having been unblocked
without consuming (i.e., freeing) the completions.
Also, occasionally threads would end up waiting
indefinitely for completions, while other mismatched
completions remained pending.
Problems Addressed in VMS712_PTHREADS02-V0100:
o The PCSI installation says it completes successfully but objects
are not inserted into IMAGELIB.OLB.
Problems Addressed in VMS712_PTHREADS-V0100:
o This kit updates the DECthreads environment for OpenVMS Alpha
V7.1-2 with new support required to run the Java JDK kit. The
new support encompasses major structural changes to DECthreads,
including fixes for performance issues.
o Because of new interdependencies between the PTHREAD$RTL and
CMA$TIS_SHR images, the minor idents for both images have been
bumped for this kit. As a result, applications built against
the updated images will NOT run correctly on OpenVMS V7.1-2
systems unless this kit has been installed. For this reason,
Compaq recommends that applications intended for use on
standard V7.1-2 systems NOT be built on systems where this
kit has been installed.
o Application of this update kit exposes a latent race condition
in MMOV V2.0. When the MMOV IVP is run, MMOV$ALPHAVCR will
fall into an infinite loop and never complete. Users of MMOV
should NOT install this update kit.
INSTALLATION NOTES:
Install this kit with the Polycenter Software Installation (PCSI)
utility by logging into the SYSTEM account, and typing the
following at the DCL prompt:
PRODUCT INSTALL VMS712_PTHREADS /SOURCE=[location of Kit]
The kit location may be a tape drive, CD, or a disk directory that
contains the kit.
Additional help on installing PCSI kits can be found by typing
HELP PRODUCT INSTALL at the system prompt.
The images in this kit will not take effect until the system is
rebooted. Compaq recommends that you reboot your system
immediately after installation of this kit. Until a reboot is
performed, the threads environment will be left in an inconsistant
state and threaded applications will fail with the following error
message:
%DCL-W-ACTIMAGE, error activating image CMA$TIS_SHR
-CLI-E-IMGNAME, image file DKA0:[SYS0.SYSCOMMON.][SYSLIB]CMA$TIS_SHR.EXE
-SYSTEM-F-SHRIDMISMAT, ident mismatch with shareable image
Other cluster nodes that share the same system disk will also need
to be rebooted soon after installing this kit. Until they are, the
threads environments on those nodes will be in an inconsistent
state and threaded applications may fail. Although a rolling
reboot is allowed, other nodes should be rebooted shortly after
installing this kit.
All trademarks are the property of their respective owners.
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Files on this server are as follows:
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»dec-axpvms-vms712_pthreads-v0300--4.README
»dec-axpvms-vms712_pthreads-v0300--4.CHKSUM
»dec-axpvms-vms712_pthreads-v0300--4.pcsi-dcx_axpexe
»vms712_pthreads-v0300.CVRLET_TXT
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