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Fix pgstat_report_waiting() to not dump core if called before

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pgstat_bestart() has been called; else any lock-block occurring
during InitPostgres() is disastrous.  I believe this explains
recent wasp regression failure; at least it explains the crash I
got while trying to duplicate the problem.  I also made
pgstat_report_activity() safe against the same scenario, just
in case.  The report_waiting hazard was created by my patch of
19-Aug to include waiting status in pg_stat_activity.
This commit is contained in:
Tom Lane 2006-08-28 19:38:09 +00:00
parent ae28cfe673
commit 1832cefda1
1 changed files with 9 additions and 10 deletions
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19
src/backend/postmaster/pgstat.c
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@ -13,7 +13,7 @@
*
* Copyright (c) 2001-2006, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.137 2006/08/19 01:36:24 tgl Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.138 2006/08/28 19:38:09 tgl Exp $
* ----------
*/
#include "postgres.h"
@ -1384,7 +1384,7 @@ pgstat_bestart(void)
static void
pgstat_beshutdown_hook(int code, Datum arg)
{
volatile PgBackendStatus *beentry;
volatile PgBackendStatus *beentry = MyBEEntry;
pgstat_report_tabstat();
@ -1393,7 +1393,6 @@ pgstat_beshutdown_hook(int code, Datum arg)
* st_changecount before and after. We use a volatile pointer here
* to ensure the compiler doesn't try to get cute.
*/
beentry = MyBEEntry;
beentry->st_changecount++;
beentry->st_procpid = 0; /* mark invalid */
@ -1413,11 +1412,11 @@ pgstat_beshutdown_hook(int code, Datum arg)
void
pgstat_report_activity(const char *cmd_str)
{
volatile PgBackendStatus *beentry;
volatile PgBackendStatus *beentry = MyBEEntry;
TimestampTz start_timestamp;
int len;
if (!pgstat_collect_querystring)
if (!pgstat_collect_querystring || !beentry)
return;
/*
@ -1434,7 +1433,6 @@ pgstat_report_activity(const char *cmd_str)
* st_changecount before and after. We use a volatile pointer here
* to ensure the compiler doesn't try to get cute.
*/
beentry = MyBEEntry;
beentry->st_changecount++;
beentry->st_activity_start_timestamp = start_timestamp;
@ -1450,14 +1448,17 @@ pgstat_report_activity(const char *cmd_str)
* pgstat_report_waiting() -
*
* Called from lock manager to report beginning or end of a lock wait.
*
* NB: this *must* be able to survive being called before MyBEEntry has been
* initialized.
* ----------
*/
void
pgstat_report_waiting(bool waiting)
{
volatile PgBackendStatus *beentry;
volatile PgBackendStatus *beentry = MyBEEntry;
if (!pgstat_collect_querystring)
if (!pgstat_collect_querystring || !beentry)
return;
/*
@ -1465,8 +1466,6 @@ pgstat_report_waiting(bool waiting)
* may modify, there seems no need to bother with the st_changecount
* protocol. The update must appear atomic in any case.
*/
beentry = MyBEEntry;
beentry->st_waiting = waiting;
}