mirror/postgresql
2
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2024-12-21 08:29:39 +08:00
Code Issues Packages Projects Releases Wiki Activity

Make NOTIFY_PAYLOAD_MAX_LENGTH depend explicitly on BLCKSZ and

Browse Source 
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.
This commit is contained in:
Tom Lane 2010-02-17 00:52:09 +00:00
parent d1e027221d
commit ee678fe30c
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/backend/commands/async.c
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * 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 * Maximum size of a NOTIFY payload, including terminating NULL. This
* must be kept small enough so that a notification message fits on one * 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 * Struct representing an entry in the global notify queue