Experimental Physics and
Industrial Control System

Tony Cox - (415)926-3105 <[email protected]> · Thu, 09 Feb 1995 13:58:56 PST

>> Finally, there is the question of channel access, which we have thrashed out
>> before. Final generic support for LE-BE and BE-LE systems will not be
>> implemented until R4 (correct me Jeff if I'm wrong here). In the interim, CA
>> runs on other LE systems (eg VAXes), so I'm not expecting too much trouble
>> here.
>> 
>
>The CA client library will support both ALPHA/OSF and ALPHA/VMS under 3.12
>EPICS. A version 3 EPICS portable CA server is in the works but will not be
>in release 3.12.
>
>Architecture independent data types ("typedefs") for all of the DBR_XXXX 
>types are include in db_access.h for 3.12. To remain portable CA clients 
>should use these types for any data requested from or supplied to the CA 
>client API.
>
>Jeff

Thanks Jeff. You are right, they are there in my beta-release version of
R3.12 (Beta1), but they are not yet architecturally defined (they are
unconditionally typedef'ed).

FWIW, Alpha/VMS has short=2, int=4, long=4 and void*=4, unlike Alpha/OSF
(2,4,8,8). VMS has internal constraints (specifically, its implementation of
address space mapping) which make it difficult for it to take full advantage of
the 64bit architecture of the Alpha. This constraint may be relaxed in the
future.

Tony
--------------------------------------------------------------------------------
Dr Anthony D Cox
Computer Systems Specialist
Stanford Synchrotron Radiation Laboratory
Stanford Linear Accelerator Center
MS 69, Box 4349
Stanford CA 94305
[email protected]
--------------------------------------------------------------------------------

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System