Experimental Physics and
Industrial Control System

Benjamin Sailer <[email protected]> · Fri, 1 Aug 2003 19:21:41 +0200 (CEST)

Hello all,

using R3.14beta2 cas library I was trying to create a Server that
dynamically creates PVs (serving as a parameters that the server
itself can get from another source).  Up to now, every time when
I received the query for a new PV, the cas checks whether it conforms
to a naming convention and - if so - creates a PV that can be used
to transfer the parameters.  But as those are allocated dynamically,
the memory consumption of the server would grow to infinate if the
server is running all the time, so I was wondering whether I could
remove PVs once used.  I tried this and failed, but I'm not sure
whether this was due to wrong programming on my side.  Is there some
caching of parameters that could fail if I give a pointer to my
parameter as a return value of

pvAttachReturn pvAttach(const casCtx &ctx, const char *pPVName);

and after some time calling a 'delete' for this pointer.  I was thinking
of something like

<snip>
while (aitTrue) {
	fileDescriptorManager.process(SCAN_INTERVAL);
	cas->expireParams(EXPIRE_INTERVAL);
}
</snip>

in main() where cas->expireParams() looks for parameters unused
and removes them from the parameter list that is checked on every

pvExistReturn pvExistTest(const casCtx &ctx, const char *pPVName);

(I really don't state this is not working due to the cas library,
I just want to rule out that this can be the source of my problem).

Thanks

Benjamin

-- 
*****************************************************************
Benjamin Sailer
eMail: [email protected]
*****************************************************************
Disclaimer:  This signature has been generated automatically and
does not reflect my opinion at all.
                -- Benjamin Sailer

Graduate students and most professors are no smarter than undergrads.
They're just older.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System