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 files changed, 8 insertions, 12 deletions

diff --git a/src/backend/replication/walreceiverfuncs.c b/src/backend/replication/walreceiverfuncs.c
index be305790fd3..78ee7fb9f7e 100644
--- a/src/backend/replication/walreceiverfuncs.c
+++ b/src/backend/replication/walreceiverfuncs.c
@@ -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)? */