postgresql/contrib/pgrowlocks/pgrowlocks--1.0.sql
Tom Lane 029fac2264 Avoid use of CREATE OR REPLACE FUNCTION in extension installation files.
It was never terribly consistent to use OR REPLACE (because of the lack of
comparable functionality for data types, operators, etc), and
experimentation shows that it's now positively pernicious in the extension
world.  We really want a failure to occur if there are any conflicts, else
it's unclear what the extension-ownership state of the conflicted object
ought to be.  Most of the time, CREATE EXTENSION will fail anyway because
of conflicts on other object types, but an extension defining only
functions can succeed, with bad results.
2011-02-13 22:54:52 -05:00

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SQL

/* contrib/pgrowlocks/pgrowlocks--1.0.sql */
CREATE FUNCTION pgrowlocks(IN relname text,
OUT locked_row TID, -- row TID
OUT lock_type TEXT, -- lock type
OUT locker XID, -- locking XID
OUT multi bool, -- multi XID?
OUT xids xid[], -- multi XIDs
OUT pids INTEGER[]) -- locker's process id
RETURNS SETOF record
AS 'MODULE_PATHNAME', 'pgrowlocks'
LANGUAGE C STRICT;