Log Message:
-----------
Volatile-qualify the ProcArray PGPROC pointer in a bunch of routines
that examine fields that could change under them. This is just to make
really sure that when we are fetching a value 'only once', that's what
actually happens. Possibly this is a bug that should be back-patched,
but in the absence of solid evidence that it's needed, I won't bother.

Modified Files:
--------------
pgsql/src/backend/storage/ipc:
procarray.c (r1.29 -> r1.30)
(http://developer.postgresql.org/cvsw...1=1.29&r2=1.30)

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