From: | Julien Rouhaud <julien(dot)rouhaud(at)dalibo(dot)com> |
---|---|
To: | Attila Soki <atiware(at)gmx(dot)net>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: plugin dev, oid to pointer map |
Date: | 2016-05-30 00:43:16 |
Message-ID: | a411524a-fd29-9ef2-b2cc-9dcf3756bc42@dalibo.com |
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Lists: | pgsql-general |
On 29/05/2016 22:10, Attila Soki wrote:
> Hi all,
>
Hello,
> i am about to begin with postgresql plugin development.
>H Currently i'm trying to become somewhat familiar with the postgresql sources.
>
> Without going too deep into details about the plugin, i want to use
> many Oid to pointer relations.
> The pointer is a pointer to my own struct (allocated with palloc).
> There will be approx. 1000 unique oid/pointer pairs.
>
> Basically, what i want is, to be able to get the pointer to my struct by Oid.
>
> Is there is a suitable hashmap or key-value storage solution in the pg code?
> if so, please point me to the right part of the source.
>
Yes, there's an hashtable implementation, see dynahash.c
If you want to use that in shared memory in your extension, you can look
at the pg_stat_statements extension (look for pgss_hash) for an example.
Regards.
--
Julien Rouhaud
http://dalibo.com - http://dalibo.org
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