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Make stats_temp_directory PGC_SIGHUP, and document how it may cause a temporary

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"outage" of the statistics views.

This requires making the stats collector respond to SIGHUP, like the other
utility processes already did.
This commit is contained in:
Magnus Hagander
2008-08-25 15:11:01 +00:00
parent 8c032adec4
commit be8d6c5c34
4 changed files with 29 additions and 8 deletions
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22
src/backend/postmaster/pgstat.c
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@@ -13,7 +13,7 @@
*
* Copyright (c) 2001-2008, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.179 2008/08/15 08:37:39 mha Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.180 2008/08/25 15:11:00 mha Exp $
* ----------
*/
#include "postgres.h"
@@ -203,6 +203,7 @@ static PgStat_GlobalStats globalStats;
static volatile bool need_exit = false;
static volatile bool need_statwrite = false;
static volatile bool got_SIGHUP = false;
/*
* Total time charged to functions so far in the current backend.
@@ -224,6 +225,7 @@ NON_EXEC_STATIC void PgstatCollectorMain(int argc, char *argv[]);
static void pgstat_exit(SIGNAL_ARGS);
static void force_statwrite(SIGNAL_ARGS);
static void pgstat_beshutdown_hook(int code, Datum arg);
static void pgstat_sighup_handler(SIGNAL_ARGS);
static PgStat_StatDBEntry *pgstat_get_db_entry(Oid databaseid, bool create);
static void pgstat_write_statsfile(bool permanent);
@@ -2571,7 +2573,7 @@ PgstatCollectorMain(int argc, char *argv[])
* Ignore all signals usually bound to some action in the postmaster,
* except SIGQUIT and SIGALRM.
*/
pqsignal(SIGHUP, SIG_IGN);
pqsignal(SIGHUP, pgstat_sighup_handler);
pqsignal(SIGINT, SIG_IGN);
pqsignal(SIGTERM, SIG_IGN);
pqsignal(SIGQUIT, pgstat_exit);
@@ -2634,6 +2636,15 @@ PgstatCollectorMain(int argc, char *argv[])
if (need_exit)
break;
/*
* Reload configuration if we got SIGHUP from the postmaster.
*/
if (got_SIGHUP)
{
ProcessConfigFile(PGC_SIGHUP);
got_SIGHUP = false;
}
/*
* If time to write the stats file, do so. Note that the alarm
* interrupt isn't re-enabled immediately, but only after we next
@@ -2834,6 +2845,13 @@ force_statwrite(SIGNAL_ARGS)
need_statwrite = true;
}
/* SIGHUP handler for collector process */
static void
pgstat_sighup_handler(SIGNAL_ARGS)
{
got_SIGHUP = true;
}
/*
* Lookup the hash table entry for the specified database. If no hash