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BUG #2406: Not all systems support SHM_SHARE_MMU

From: "Paul van der Zwan" <paul(dot)vanderzwan(at)sun(dot)com>
To: pgsql-bugs(at)postgresql(dot)org
Subject: BUG #2406: Not all systems support SHM_SHARE_MMU
Date: 2006-04-24 20:18:29
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Lists: pgsql-bugs
The following bug has been logged online:

Bug reference:      2406
Logged by:          Paul van der Zwan
Email address:      paul(dot)vanderzwan(at)sun(dot)com
PostgreSQL version: 8.1.3
Operating system:   Solaris
Description:        Not all systems support SHM_SHARE_MMU

Only systems with large pagesizes support ISM, so always defining 
#define PG_SHMAT_FLAGS                  SHM_SHARE_MMU
in src/backend/port/sysv_shmem.c  will cause all calls to shmat to fail with
EINVAL on systems that do not support large pages.
The following may be a better check:
#define PG_SHMAT_FLAGS ((getpagesizes(0,NULL)>1)?SHM_SHARE_MMU:0)
#define PG_SHMAT_FLAGS 0

This problem manifested itself on a VIA Mini ITX system and Solaris Nevada (
build 36) 

 Paul van der Zwan


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