RE: startPVAServer prevents windows-x64 IOC from exiting

[Mark Rivers via Core-talk <core-talk at aps.anl.gov>]

Hi Michael,

 

Thanks for the suggestion. 

 

Here is the output when I run with the atExitDebug variable set on windows-x64-static.  It exits normally.

 

J:\epics\devel\example\iocBoot\iocexample>..\..\bin\windows-x64-static\example.exe st.cmd

#!../../bin/windows-x64/example

#< envPaths

## Register all support components

dbLoadDatabase "../../dbd/example.dbd"

example_registerRecordDeviceDriver(pdbbase)

## Load record instances

#dbLoadRecords("../../db/example.db","user=epics")

var atExitDebug 1

startPVAServer

iocInit()

Starting iocInit

############################################################################

## EPICS R7.0.8

## Rev.

## Rev. Date :

############################################################################

iocRun: All initialization complete

## Start any sequence programs

#seq sncexample,"user=epics"

epics>

epics> exit

atExit exitDatabase(0000000000000000)

atExit errlogExitHandler(000002B83242E040)

atExit twdShutdown(0000000000000000)

atExit syncShutdown(0000000000000000)

atExit decShutdown(0000000000000000)

atExit dbndShutdown(0000000000000000)

atExit arrShutdown(0000000000000000)

 

J:\epics\devel\example\iocBoot\iocexample>

 

Here is the output when I run with the atExistDebug variable set on windows-x64.  It prints the same atExit messages but then hangs.  Does this mean it is handing in arrShutdown, or later on?

 

J:\epics\devel\example\iocBoot\iocexample>..\..\bin\windows-x64\example.exe st.cmd

#!../../bin/windows-x64/example

#< envPaths

## Register all support components

dbLoadDatabase "../../dbd/example.dbd"

example_registerRecordDeviceDriver(pdbbase)

## Load record instances

#dbLoadRecords("../../db/example.db","user=epics")

var atExitDebug 1

startPVAServer

iocInit()

Starting iocInit

############################################################################

## EPICS R7.0.8

## Rev.

## Rev. Date :

############################################################################

iocRun: All initialization complete

## Start any sequence programs

#seq sncexample,"user=epics"

epics> exit

atExit exitDatabase(0000000000000000)

atExit errlogExitHandler(0000020FE7181060)

atExit twdShutdown(0000000000000000)

atExit syncShutdown(0000000000000000)

atExit decShutdown(0000000000000000)

atExit dbndShutdown(0000000000000000)

atExit arrShutdown(0000000000000000)

 

I had to kill the process with the Windows Task Manager at this point.

 

I just found something interesting.  If I comment out the startPVAServer line it does not hang (which I already knew), but there is now a new atExit handler called first, @pva_server_cleanup.

 

J:\epics\devel\example\iocBoot\iocexample>..\..\bin\windows-x64\example.exe st.cmd

#!../../bin/windows-x64/example

#< envPaths

## Register all support components

dbLoadDatabase "../../dbd/example.dbd"

example_registerRecordDeviceDriver(pdbbase)

## Load record instances

#dbLoadRecords("../../db/example.db","user=epics")

var atExitDebug 1

#startPVAServer

iocInit()

Starting iocInit

############################################################################

## EPICS R7.0.8

## Rev.

## Rev. Date :

############################################################################

iocRun: All initialization complete

## Start any sequence programs

#seq sncexample,"user=epics"

epics> exit

atExit &pva_server_cleanup(0000000000000000)

atExit exitDatabase(0000000000000000)

atExit twdShutdown(0000000000000000)

atExit errlogExitHandler(0000019F55DD8340)

atExit syncShutdown(0000000000000000)

atExit decShutdown(0000000000000000)

atExit dbndShutdown(0000000000000000)

atExit arrShutdown(0000000000000000)

 

J:\epics\devel\example\iocBoot\iocexample>

 

If I type the iocsh command stopPVAServer before typing exit then it works fine.

 

J:\epics\devel\example\iocBoot\iocexample>..\..\bin\windows-x64\example.exe st.cmd

#!../../bin/windows-x64/example

#< envPaths

## Register all support components

dbLoadDatabase "../../dbd/example.dbd"

example_registerRecordDeviceDriver(pdbbase)

## Load record instances

#dbLoadRecords("../../db/example.db","user=epics")

var atExitDebug 1

startPVAServer

iocInit()

Starting iocInit

############################################################################

## EPICS R7.0.8

## Rev.

## Rev. Date :

############################################################################

iocRun: All initialization complete

## Start any sequence programs

#seq sncexample,"user=epics"

epics> stopPVAServer

epics> exit

atExit exitDatabase(0000000000000000)

atExit errlogExitHandler(00000259BB9AEA70)

atExit twdShutdown(0000000000000000)

atExit syncShutdown(0000000000000000)

atExit decShutdown(0000000000000000)

atExit dbndShutdown(0000000000000000)

atExit arrShutdown(0000000000000000)

 

J:\epics\devel\example\iocBoot\iocexample>

 

It looks to me like the PVA server is not stopping as part of the IOC shutdown on windows-x64 unless it is done manually at the command line first.

 

Thanks,

Mark

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-----Original Message-----
From: Michael Davidsaver <mdavidsaver at gmail.com>
Sent: Wednesday, March 13, 2024 6:10 AM
To: Mark Rivers <rivers at cars.uchicago.edu>
Cc: core-talk at aps.anl.gov
Subject: Re: startPVAServer prevents windows-x64 IOC from exiting

 

Hi Mark,

 

My first suspicion is that an epicsAtExit() handler is hanging, although I can't explain why this would differ between static to dynamic linking.

 

Setting the atExitDebug IOC shell variable will print each handler name as it is executed.

 

> epics> var atExitDebug 1

> epics> exit

> atExit exitDatabase((nil))

> atExit twdShutdown((nil))

> atExit errlogExitHandler(0x558c4d454fb0) atExit rlExit((nil)) atExit

> syncShutdown((nil)) atExit decShutdown((nil)) atExit

> dbndShutdown((nil)) atExit arrShutdown((nil)) atExit

> ClockTime_Shutdown((nil))

 

 

On 3/12/24 15:08, Mark Rivers via Core-talk wrote:

> I previously sent this message to both tech-talk and core-talk.  Neither Andrew Johnson nor I received it.  I know that some people who are subscribed to tech-talk did receive it.  It looks like perhaps people who are subscribed to both lists do not receive the message at all?

>

> I the future I will only send to one list or the other, since Andrew points out that core-talk is a subset of tech-talk.

>

> *From:*Mark Rivers

> *Sent:* Tuesday, March 12, 2024 3:54 PM

> *To:* tech-talk at aps.anl.gov; core-talk at aps.anl.gov

> *Subject:* startPVAServer prevents windows-x64 IOC from exiting

>

> Folks,

>

> I have found a serious problem with using the PVA server on Windows IOCs that are dynamically built.  The IOC runs fine, but cannot be exited either with the “exit” command or with ^C.  It can only be killed with the Windows Task Manager.  The problem occurs on the following:

>

>   * EPICS_HOST_ARCH: window-x64, windows-x64-debug.  Does not occur on windows-x64-static.

>   * EPICS BASE: 7.0.7 and 7.0.8.  Did not test other versions.

>   * Test application: makeBaseApp.pl from base 7.0.8.  Modified st.cmd to add the line startPVAServer just before iocInit.  Also happens in ADSimDetector with commonPlugins.cmd.

>

> Thanks,

>

> Mark

>