Re: startPVAServer prevents windows-x64 IOC from exiting

[Michael Davidsaver via Core-talk <core-talk at aps.anl.gov>]

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