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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2010-02-17 00:52:09 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2010-02-17 00:52:09 +0000 |
| commit | ee678fe30c3b9088f0ed956eb33c37f15a429932 (patch) | |
| tree | 5f863171374c15c898bbc8f3749b5cc4ddf26f34 | |
| parent | d1e027221d0243b7b57eabb0e482923dd7d1c8eb (diff) | |
| download | postgresql-ee678fe30c3b9088f0ed956eb33c37f15a429932.tar.gz postgresql-ee678fe30c3b9088f0ed956eb33c37f15a429932.zip | |
Make NOTIFY_PAYLOAD_MAX_LENGTH depend explicitly on BLCKSZ and
NAMEDATALEN, so this code doesn't go nuts with smaller than default
BLCKSZ or larger than default NAMEDATALEN. The standard value is
still exactly 8000.
| -rw-r--r-- | src/backend/commands/async.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c index f5863480f5e..23c57cea044 100644 --- a/src/backend/commands/async.c +++ b/src/backend/commands/async.c @@ -7,7 +7,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/commands/async.c,v 1.151 2010/02/16 22:34:43 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/commands/async.c,v 1.152 2010/02/17 00:52:09 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -137,9 +137,12 @@ /* * Maximum size of a NOTIFY payload, including terminating NULL. This * must be kept small enough so that a notification message fits on one - * SLRU page. + * SLRU page. The magic fudge factor here is noncritical as long as it's + * more than AsyncQueueEntryEmptySize --- we make it significantly bigger + * than that, so changes in that data structure won't affect user-visible + * restrictions. */ -#define NOTIFY_PAYLOAD_MAX_LENGTH 8000 +#define NOTIFY_PAYLOAD_MAX_LENGTH (BLCKSZ - NAMEDATALEN - 128) /* * Struct representing an entry in the global notify queue |