EPICS Re: iocShutdown() hooks

Experimental Physics and Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	Re: iocShutdown() hooks
From:	Michael Davidsaver <[email protected]>
To:	Andrew Johnson <[email protected]>
Cc:	EPICS core-talk <[email protected]>
Date:	Wed, 31 May 2017 02:54:03 +0200

On 05/30/2017 06:42 PM, Andrew Johnson wrote:
> Hi Michael,
> 
> On 05/25/2017 09:06 AM, Michael Davidsaver wrote:
>> I've realized that I need to hook into iocShutdown() to be able to
>> automatically shutdown QSRV during unittests.  I need to do so during
>> the "stop" phase (eg. scanStop()) before records and lockSets are free'd.
>>
>> My first though would be to use initHooks.h.  So I'd like to add
>>
>> * initHookAtShutdown  - at start of iocShutdown()
>> * initHookAfterCloseLinks - after dbCaShutdown()
>> * initHookAtStopped - Just after iocShutdown() returns
> 
> No objections in principle, but a cleaner option might be to add methods
> to the dbServer structure (which QSRV should support if possible) and
> make the rsrv_init(), rsrv_run() and rsrv_pause() calls in iocInit into
> calls to all registered servers through this interface. The
> dbRegisterServer() call in rsrv_init() would move into a registrar
> routine referenced in a new rsrv.dbd file.

I'm going to add the (de) initHooks anyway as this is something would
have been helpful to me before for driver work.

I don't see what you're getting at wrt. dbServer.  How would this be
cleaner than an initHook?   Seems the same to me.  Were you thinking to
pass in some additional arguments?

> Will QSRV support pausing? This was added for DESY's hot-standby work; I
> don't see it as particularly important, but QSRV should probably display
> a warning message when someone tries to use it if it's not supported.

No plans.  I hadn't considered this as I've never paused RSRV.

Replies:: Re: iocShutdown() hooks Andrew Johnson; Re: iocShutdown() hooks Michael Davidsaver

References:: iocShutdown() hooks Michael Davidsaver; Re: iocShutdown() hooks Andrew Johnson

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