Experimental Physics and
Industrial Control System

[email protected] · Tue, 13 Jul 1999 14:13:41 -0700 (PDT)

Hello -

We have found a GDD problem that causes our gateway process (which makes
PEPII accelerator data available to the BaBar detector) to crash.  I have
made a temporary change to base/src/gdd/dbMapper.cc to get around this
problem.  I suspect this problem has already been fixed(?).
The problem goes like this:

In db_access.h, there is a set of data request buffer types (DBR_xxxx's).
In 3.13.1, there are a total of 39 types.  In gdd/dbMapper.cc, there are 
arrays which should be sized by the maximum number of these buffer types.
PCAS indexes into these arrays directly using the DBR type value as the 
index.  However, the 3.13.1 dbMapper.cc arrays are only sized for 35 
(nothing was added for DBR_PUT_ACKT, DBR_PUT_ACKS, DBR_STSACK_STRING,
and DBR_CLASS_NAME).  So when BaBar started asking for DBR_STSACK_STRING 
for some PEPII magnets on Friday (they were added to the alarm handler), 
the gateway crashed...and crashed...and crashed
and people got called...and called...and called.

Anyway, I will make my dbMapper.cc changes available to anyone who's 
interested.  If dbMapper.cc has already been changed, I'd like to use
the "official" version - all I need is the differences (has nobody EVER 
added a PCAS PV (non-IOC PV) to their alarm handler?).

Thank you,

Stephanie Allison

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System