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Make NOTIFY_PAYLOAD_MAX_LENGTH depend explicitly on BLCKSZ and

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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
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9
src/backend/commands/async.c
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@ -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