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Modify ShmemInitStruct and ShmemInitHash to throw errors internally,
rather than returning NULL for some-but-not-all failures as they used to. Remove now-redundant tests for NULL from call sites. We had to do something about this because many call sites were failing to check for NULL; and changing it like this seems a lot more useful and mistake-proof than adding checks to the call sites without them.
1 parent 5f70a04 commit 77acab7

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12 files changed

+88
-113
lines changed

12 files changed

+88
-113
lines changed

‎contrib/pg_stat_statements/pg_stat_statements.c

Lines changed: 1 addition & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -14,7 +14,7 @@
1414
* Copyright (c) 2008-2010, PostgreSQL Global Development Group
1515
*
1616
* IDENTIFICATION
17-
* $PostgreSQL: pgsql/contrib/pg_stat_statements/pg_stat_statements.c,v 1.13 2010/02/26 02:00:32 momjian Exp $
17+
* $PostgreSQL: pgsql/contrib/pg_stat_statements/pg_stat_statements.c,v 1.14 2010/04/28 16:54:15 tgl Exp $
1818
*
1919
*-------------------------------------------------------------------------
2020
*/
@@ -321,8 +321,6 @@ pgss_shmem_startup(void)
321321
pgss = ShmemInitStruct("pg_stat_statements",
322322
sizeof(pgssSharedState),
323323
&found);
324-
if (!pgss)
325-
elog(ERROR, "out of shared memory");
326324

327325
if (!found)
328326
{
@@ -343,8 +341,6 @@ pgss_shmem_startup(void)
343341
pgss_max, pgss_max,
344342
&info,
345343
HASH_ELEM | HASH_FUNCTION | HASH_COMPARE);
346-
if (!pgss_hash)
347-
elog(ERROR, "out of shared memory");
348344

349345
LWLockRelease(AddinShmemInitLock);
350346

‎doc/src/sgml/xfunc.sgml

Lines changed: 1 addition & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.145 2010/04/03 07:22:56 petere Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/xfunc.sgml,v 1.146 2010/04/28 16:54:15 tgl Exp $ -->
22

33
<sect1 id="xfunc">
44
<title>User-Defined Functions</title>
@@ -3350,8 +3350,6 @@ void RequestAddinLWLocks(int n)
33503350

33513351
LWLockAcquire(AddinShmemInitLock, LW_EXCLUSIVE);
33523352
ptr = ShmemInitStruct("my struct name", size, &amp;found);
3353-
if (!ptr)
3354-
elog(ERROR, "out of shared memory");
33553353
if (!found)
33563354
{
33573355
initialize contents of shmem area;

‎src/backend/access/transam/slru.c

Lines changed: 1 addition & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -41,7 +41,7 @@
4141
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
4242
* Portions Copyright (c) 1994, Regents of the University of California
4343
*
44-
* $PostgreSQL: pgsql/src/backend/access/transam/slru.c,v 1.49 2010/02/16 22:34:43 tgl Exp $
44+
* $PostgreSQL: pgsql/src/backend/access/transam/slru.c,v 1.50 2010/04/28 16:54:15 tgl Exp $
4545
*
4646
*-------------------------------------------------------------------------
4747
*/
@@ -164,8 +164,6 @@ SimpleLruInit(SlruCtl ctl, const char *name, int nslots, int nlsns,
164164
shared = (SlruShared) ShmemInitStruct(name,
165165
SimpleLruShmemSize(nslots, nlsns),
166166
&found);
167-
if (!shared)
168-
elog(ERROR, "out of shared memory");
169167

170168
if (!IsUnderPostmaster)
171169
{

‎src/backend/commands/async.c

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1994, Regents of the University of California
88
*
99
* IDENTIFICATION
10-
* $PostgreSQL: pgsql/src/backend/commands/async.c,v 1.156 2010/04/05 00:42:24 tgl Exp $
10+
* $PostgreSQL: pgsql/src/backend/commands/async.c,v 1.157 2010/04/28 16:54:15 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -464,9 +464,6 @@ AsyncShmemInit(void)
464464
asyncQueueControl = (AsyncQueueControl *)
465465
ShmemInitStruct("Async Queue Control", size, &found);
466466

467-
if (!asyncQueueControl)
468-
elog(ERROR, "out of shared memory");
469-
470467
if (!found)
471468
{
472469
/* First time through, so initialize it */

‎src/backend/postmaster/autovacuum.c

Lines changed: 1 addition & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -55,7 +55,7 @@
5555
*
5656
*
5757
* IDENTIFICATION
58-
* $PostgreSQL: pgsql/src/backend/postmaster/autovacuum.c,v 1.109 2010/02/26 02:00:55 momjian Exp $
58+
* $PostgreSQL: pgsql/src/backend/postmaster/autovacuum.c,v 1.110 2010/04/28 16:54:15 tgl Exp $
5959
*
6060
*-------------------------------------------------------------------------
6161
*/
@@ -2771,10 +2771,6 @@ AutoVacuumShmemInit(void)
27712771
ShmemInitStruct("AutoVacuum Data",
27722772
AutoVacuumShmemSize(),
27732773
&found);
2774-
if (AutoVacuumShmem == NULL)
2775-
ereport(FATAL,
2776-
(errcode(ERRCODE_OUT_OF_MEMORY),
2777-
errmsg("not enough shared memory for autovacuum")));
27782774

27792775
if (!IsUnderPostmaster)
27802776
{

‎src/backend/postmaster/bgwriter.c

Lines changed: 9 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -38,7 +38,7 @@
3838
*
3939
*
4040
* IDENTIFICATION
41-
* $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.67 2010/02/05 23:37:43 momjian Exp $
41+
* $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.68 2010/04/28 16:54:15 tgl Exp $
4242
*
4343
*-------------------------------------------------------------------------
4444
*/
@@ -890,16 +890,14 @@ BgWriterShmemInit(void)
890890
ShmemInitStruct("Background Writer Data",
891891
BgWriterShmemSize(),
892892
&found);
893-
if (BgWriterShmem == NULL)
894-
ereport(FATAL,
895-
(errcode(ERRCODE_OUT_OF_MEMORY),
896-
errmsg("not enough shared memory for background writer")));
897-
if (found)
898-
return; /* already initialized */
899-
900-
MemSet(BgWriterShmem, 0, sizeof(BgWriterShmemStruct));
901-
SpinLockInit(&BgWriterShmem->ckpt_lck);
902-
BgWriterShmem->max_requests = NBuffers;
893+
894+
if (!found)
895+
{
896+
/* First time through, so initialize */
897+
MemSet(BgWriterShmem, 0, sizeof(BgWriterShmemStruct));
898+
SpinLockInit(&BgWriterShmem->ckpt_lck);
899+
BgWriterShmem->max_requests = NBuffers;
900+
}
903901
}
904902

905903
/*

‎src/backend/replication/walreceiverfuncs.c

Lines changed: 8 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -10,7 +10,7 @@
1010
*
1111
*
1212
* IDENTIFICATION
13-
* $PostgreSQL: pgsql/src/backend/replication/walreceiverfuncs.c,v 1.4 2010/02/26 02:00:57 momjian Exp $
13+
* $PostgreSQL: pgsql/src/backend/replication/walreceiverfuncs.c,v 1.5 2010/04/28 16:54:15 tgl Exp $
1414
*
1515
*-------------------------------------------------------------------------
1616
*/
@@ -58,17 +58,13 @@ WalRcvShmemInit(void)
5858
WalRcv = (WalRcvData *)
5959
ShmemInitStruct("Wal Receiver Ctl", WalRcvShmemSize(), &found);
6060

61-
if (WalRcv == NULL)
62-
ereport(FATAL,
63-
(errcode(ERRCODE_OUT_OF_MEMORY),
64-
errmsg("not enough shared memory for walreceiver")));
65-
if (found)
66-
return; /* already initialized */
67-
68-
/* Initialize the data structures */
69-
MemSet(WalRcv, 0, WalRcvShmemSize());
70-
WalRcv->walRcvState = WALRCV_STOPPED;
71-
SpinLockInit(&WalRcv->mutex);
61+
if (!found)
62+
{
63+
/* First time through, so initialize */
64+
MemSet(WalRcv, 0, WalRcvShmemSize());
65+
WalRcv->walRcvState = WALRCV_STOPPED;
66+
SpinLockInit(&WalRcv->mutex);
67+
}
7268
}
7369

7470
/* Is walreceiver in progress (or starting up)? */

‎src/backend/replication/walsender.c

Lines changed: 11 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -30,7 +30,7 @@
3030
*
3131
*
3232
* IDENTIFICATION
33-
* $PostgreSQL: pgsql/src/backend/replication/walsender.c,v 1.18 2010/04/28 16:10:42 heikki Exp $
33+
* $PostgreSQL: pgsql/src/backend/replication/walsender.c,v 1.19 2010/04/28 16:54:15 tgl Exp $
3434
*
3535
*-------------------------------------------------------------------------
3636
*/
@@ -268,8 +268,7 @@ WalSndHandshake(void)
268268
if (wal_level == WAL_LEVEL_MINIMAL)
269269
ereport(FATAL,
270270
(errcode(ERRCODE_CANNOT_CONNECT_NOW),
271-
errmsg("standby connections not allowed because wal_level='minimal'")));
272-
271+
errmsg("standby connections not allowed because wal_level=\"minimal\"")));
273272

274273
/* Send a CopyOutResponse message, and start streaming */
275274
pq_beginmessage(&buf, 'H');
@@ -838,21 +837,17 @@ WalSndShmemInit(void)
838837
WalSndCtl = (WalSndCtlData *)
839838
ShmemInitStruct("Wal Sender Ctl", WalSndShmemSize(), &found);
840839

841-
if (WalSndCtl == NULL)
842-
ereport(FATAL,
843-
(errcode(ERRCODE_OUT_OF_MEMORY),
844-
errmsg("not enough shared memory for walsender")));
845-
if (found)
846-
return; /* already initialized */
847-
848-
/* Initialize the data structures */
849-
MemSet(WalSndCtl, 0, WalSndShmemSize());
850-
851-
for (i = 0; i < max_wal_senders; i++)
840+
if (!found)
852841
{
853-
WalSnd *walsnd = &WalSndCtl->walsnds[i];
842+
/* First time through, so initialize */
843+
MemSet(WalSndCtl, 0, WalSndShmemSize());
844+
845+
for (i = 0; i < max_wal_senders; i++)
846+
{
847+
WalSnd *walsnd = &WalSndCtl->walsnds[i];
854848

855-
SpinLockInit(&walsnd->mutex);
849+
SpinLockInit(&walsnd->mutex);
850+
}
856851
}
857852
}
858853

‎src/backend/storage/buffer/buf_table.c

Lines changed: 1 addition & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,7 @@
1515
*
1616
*
1717
* IDENTIFICATION
18-
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_table.c,v 1.51 2010/01/02 16:57:51 momjian Exp $
18+
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_table.c,v 1.52 2010/04/28 16:54:15 tgl Exp $
1919
*
2020
*-------------------------------------------------------------------------
2121
*/
@@ -66,9 +66,6 @@ InitBufTable(int size)
6666
size, size,
6767
&info,
6868
HASH_ELEM | HASH_FUNCTION | HASH_PARTITION);
69-
70-
if (!SharedBufHash)
71-
elog(FATAL, "could not initialize shared buffer hash table");
7269
}
7370

7471
/*

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