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Add a function pg_stat_clear_snapshot() that discards any statistics snapshot

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already collected in the current transaction; this allows plpgsql functions to
watch for stats updates even though they are confined to a single transaction.
Use this instead of the previous kluge involving pg_stat_file() to wait for
the stats collector to update in the stats regression test.  Internally,
decouple storage of stats snapshots from transaction boundaries; they'll
now stick around until someone calls pgstat_clear_snapshot --- which xact.c
still does at transaction end, to maintain the previous behavior.  This makes
the logic a lot cleaner, at the price of a couple dozen cycles per transaction
exit.
This commit is contained in:
Tom Lane
2007-02-07 23:11:30 +00:00
parent d9ce68872f
commit aec4cf1c8c
9 changed files with 192 additions and 170 deletions
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3
src/include/pgstat.h
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@ -5,7 +5,7 @@
*
* Copyright (c) 2001-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.52 2007/01/05 22:19:50 momjian Exp $
* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.53 2007/02/07 23:11:30 tgl Exp $
* ----------
*/
#ifndef PGSTAT_H
@ -380,6 +380,7 @@ extern void pgstat_report_tabstat(void);
extern void pgstat_vacuum_tabstat(void);
extern void pgstat_drop_relation(Oid relid);
extern void pgstat_clear_snapshot(void);
extern void pgstat_reset_counters(void);
extern void pgstat_report_autovac(Oid dboid);