From: | Bruce Momjian <bruce(at)momjian(dot)us> |
---|---|
To: | Marc Munro <marc(at)bloodnok(dot)com> |
Cc: | pgsql-patches(at)postgresql(dot)org |
Subject: | Re: New shared memory hooks proposal (was Re: |
Date: | 2006-08-01 19:04:25 |
Message-ID: | 200608011904.k71J4P312093@momjian.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers pgsql-patches |
I updated the style of your patch, and added a little to your comment
block about how to use this capability. I don't think any additional
documentation is necessary.
Thanks.
---------------------------------------------------------------------------
Marc Munro wrote:
-- Start of PGP signed section.
> The attached patch provides add-ins with the means to register for
> shared memory and LWLocks. This greatly improves the ease with which
> shared memory may be used from add-ins, while keeping the accounting and
> management for that shared memory separate.
>
> Specifically it adds named add-in shared memory contexts. From these,
> memory can be allocated without affecting the memory available in other
> contexts.
>
> Usage is as follows:
> from add-in functions called from preload_libraries, you may call
> RegisterAddinContext(const * name, size_t size)
> to register a new (logical) shared memory segment.
>
> and
> RegisterAddinLWLock(LWLockid *lock_ptr);
> to request that a LWLock be allocated, placed into *lock_ptr.
>
> The actual creation of the shared memory segment and lwlocks is
> performed later as part of shared memory initialisation.
>
> To allocate shared memory from a named context you would use
> ShmemAllocFromContext(size_t size, const char *name);
>
> To reset a shared memory context back to its original unused state (from
> which new allocations may be performed), you may use
> ShmemResetContext(const char *name);
>
> This works for me (for Veil) and make check runs fine.
>
> I have not included any documentation updates in the patch as I'm not
> sure where such API changes should be documented.
>
> All comments, questions and suggestions are welcomed.
>
> __
> Marc
[ Attachment, skipping... ]
-- End of PGP section, PGP failed!
--
Bruce Momjian bruce(at)momjian(dot)us
EnterpriseDB http://www.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
Attachment | Content-Type | Size |
---|---|---|
/rtmp/diff | text/x-diff | 12.5 KB |
From | Date | Subject | |
---|---|---|---|
Next Message | Chris Browne | 2006-08-01 20:05:06 | Replication Documentation |
Previous Message | Andrew Dunstan | 2006-08-01 18:31:34 | Re: better support of out parameters in plperl |
From | Date | Subject | |
---|---|---|---|
Next Message | Chris Browne | 2006-08-01 20:05:06 | Replication Documentation |
Previous Message | Andrew Dunstan | 2006-08-01 18:31:34 | Re: better support of out parameters in plperl |