On Wed, Jun 27, 2012 at 9:52 AM, Stephen Frost <sfr...@snowman.net> wrote: > What this all boils down to is- can you have a shm segment that goes > away when no one is still attached to it, but actually give it a name > and then detect if it already exists atomically on startup on > Linux/Unixes? If so, perhaps we could use the same mechanism on both..
As I understand it, no. You can either have anonymous shared mappings, which go away when no longer in use but do not have a name. Or you can have POSIX or sysv shm, which have a name but do not automatically go away when no longer in use. There seems to be no method for setting up a segment that both has a name and goes away automatically. POSIX shm in particular tries to "look like a file", whereas anonymous memory tries to look more like malloc (except that you can share the mapping with child processes). -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
