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Modify ShmemInitStruct and ShmemInitHash to throw errors internally,

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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.
This commit is contained in:
Tom Lane
2010-04-28 16:54:16 +00:00
parent 5f70a04c56
commit 77acab75df
12 changed files with 87 additions and 112 deletions
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20
src/backend/replication/walreceiverfuncs.c
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@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/replication/walreceiverfuncs.c,v 1.4 2010/02/26 02:00:57 momjian Exp $
* $PostgreSQL: pgsql/src/backend/replication/walreceiverfuncs.c,v 1.5 2010/04/28 16:54:15 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -58,17 +58,13 @@ WalRcvShmemInit(void)
WalRcv = (WalRcvData *)
ShmemInitStruct("Wal Receiver Ctl", WalRcvShmemSize(), &found);
if (WalRcv == NULL)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("not enough shared memory for walreceiver")));
if (found)
return; /* already initialized */
/* Initialize the data structures */
MemSet(WalRcv, 0, WalRcvShmemSize());
WalRcv->walRcvState = WALRCV_STOPPED;
SpinLockInit(&WalRcv->mutex);
if (!found)
{
/* First time through, so initialize */
MemSet(WalRcv, 0, WalRcvShmemSize());
WalRcv->walRcvState = WALRCV_STOPPED;
SpinLockInit(&WalRcv->mutex);
}
}
/* Is walreceiver in progress (or starting up)? */