Re: Safely calling index_getprocinfo() while holding an nbtree exclusive buffer lock - Mailing list pgsql-hackers

Peter Geoghegan <pg@bowt.ie> writes:
> My nbtree patch [1] needs to call index_getprocinfo() with an
> exclusive buffer lock held during a leaf page split.

I think you should stop right there and ask why.  Surely that info
can be obtained before starting the operation?  Quite aside from the
deadlock hazard, I do not think holding an exclusive buffer lock
for long enough to go consult a system catalog will be acceptable
from a performance/concurrency standpoint.

            regards, tom lane