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Back-patch fix for bugs in pgstat_initstats.

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This commit is contained in:
Tom Lane
2003-07-22 19:00:36 +00:00
parent fd9397c0e7
commit 3196738793
1 changed files with 45 additions and 37 deletions
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82
src/backend/postmaster/pgstat.c
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@@ -16,7 +16,7 @@
*
* Copyright (c) 2001, PostgreSQL Global Development Group
*
* $Header: /cvsroot/pgsql/src/backend/postmaster/pgstat.c,v 1.31 2002/10/24 23:19:13 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/postmaster/pgstat.c,v 1.31.2.1 2003/07/22 19:00:36 tgl Exp $
* ----------
*/
#include "postgres.h"
@@ -75,13 +75,15 @@ static int pgStatPid;
static long pgStatNumMessages = 0;
static bool pgStatRunningInCollector = FALSE;
static int pgStatTabstatAlloc = 0;
static int pgStatTabstatUsed = 0;
static PgStat_MsgTabstat **pgStatTabstatMessages = NULL;
#define TABSTAT_QUANTUM 4 /* we alloc this many at a time */
static int pgStatXactCommit = 0;
static int pgStatXactRollback = 0;
static TransactionId pgStatDBHashXact = InvalidTransactionId;
static HTAB *pgStatDBHash = NULL;
static HTAB *pgStatBeDead = NULL;
@@ -752,32 +754,37 @@ pgstat_initstats(PgStat_Info *stats, Relation rel)
}
/*
* On the first of all calls initialize the message buffers.
* On the first of all calls create some message buffers.
*/
if (pgStatTabstatAlloc == 0)
if (pgStatTabstatMessages == NULL)
{
pgStatTabstatAlloc = 4;
pgStatTabstatMessages = (PgStat_MsgTabstat **)
malloc(sizeof(PgStat_MsgTabstat *) * pgStatTabstatAlloc);
if (pgStatTabstatMessages == NULL)
PgStat_MsgTabstat *newMessages;
PgStat_MsgTabstat **msgArray;
newMessages = (PgStat_MsgTabstat *)
malloc(sizeof(PgStat_MsgTabstat) * TABSTAT_QUANTUM);
if (newMessages == NULL)
{
elog(LOG, "PGSTATBE: malloc() failed");
elog(LOG, "out of memory");
return;
}
for (i = 0; i < pgStatTabstatAlloc; i++)
msgArray = (PgStat_MsgTabstat **)
malloc(sizeof(PgStat_MsgTabstat *) * TABSTAT_QUANTUM);
if (msgArray == NULL)
{
pgStatTabstatMessages[i] = (PgStat_MsgTabstat *)
malloc(sizeof(PgStat_MsgTabstat));
if (pgStatTabstatMessages[i] == NULL)
{
elog(LOG, "PGSTATBE: malloc() failed");
return;
}
free(newMessages);
elog(LOG, "out of memory");
return;
}
MemSet(newMessages, 0, sizeof(PgStat_MsgTabstat) * TABSTAT_QUANTUM);
for (i = 0; i < TABSTAT_QUANTUM; i++)
msgArray[i] = newMessages++;
pgStatTabstatMessages = msgArray;
pgStatTabstatAlloc = TABSTAT_QUANTUM;
}
/*
* Lookup the so far used table slots for this relation.
* Search the already-used message slots for this relation.
*/
for (mb = 0; mb < pgStatTabstatUsed; mb++)
{
@@ -799,7 +806,6 @@ pgstat_initstats(PgStat_Info *stats, Relation rel)
*/
i = pgStatTabstatMessages[mb]->m_nentries++;
useent = &pgStatTabstatMessages[mb]->m_entry[i];
memset(useent, 0, sizeof(PgStat_TableEntry));
useent->t_id = rel_id;
stats->tabentry = (void *) useent;
return;
@@ -810,27 +816,31 @@ pgstat_initstats(PgStat_Info *stats, Relation rel)
*/
if (pgStatTabstatUsed >= pgStatTabstatAlloc)
{
pgStatTabstatAlloc += 4;
pgStatTabstatMessages = (PgStat_MsgTabstat **)
realloc(pgStatTabstatMessages,
sizeof(PgStat_MsgTabstat *) * pgStatTabstatAlloc);
if (pgStatTabstatMessages == NULL)
int newAlloc = pgStatTabstatAlloc + TABSTAT_QUANTUM;
PgStat_MsgTabstat *newMessages;
PgStat_MsgTabstat **msgArray;
newMessages = (PgStat_MsgTabstat *)
malloc(sizeof(PgStat_MsgTabstat) * TABSTAT_QUANTUM);
if (newMessages == NULL)
{
pgStatTabstatAlloc -= 4;
elog(LOG, "PGSTATBE: malloc() failed");
elog(LOG, "out of memory");
return;
}
for (i = pgStatTabstatUsed; i < pgStatTabstatAlloc; i++)
msgArray = (PgStat_MsgTabstat **)
realloc(pgStatTabstatMessages,
sizeof(PgStat_MsgTabstat *) * newAlloc);
if (msgArray == NULL)
{
pgStatTabstatMessages[i] = (PgStat_MsgTabstat *)
malloc(sizeof(PgStat_MsgTabstat));
if (pgStatTabstatMessages[i] == NULL)
{
pgStatTabstatAlloc -= 4;
elog(LOG, "PGSTATBE: malloc() failed");
return;
}
free(newMessages);
elog(LOG, "out of memory");
return;
}
MemSet(newMessages, 0, sizeof(PgStat_MsgTabstat) * TABSTAT_QUANTUM);
for (i = 0; i < TABSTAT_QUANTUM; i++)
msgArray[pgStatTabstatAlloc + i] = newMessages++;
pgStatTabstatMessages = msgArray;
pgStatTabstatAlloc = newAlloc;
}
/*
@@ -839,10 +849,8 @@ pgstat_initstats(PgStat_Info *stats, Relation rel)
mb = pgStatTabstatUsed++;
pgStatTabstatMessages[mb]->m_nentries = 1;
useent = &pgStatTabstatMessages[mb]->m_entry[0];
memset(useent, 0, sizeof(PgStat_TableEntry));
useent->t_id = rel_id;
stats->tabentry = (void *) useent;
return;
}