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Re: Storing a dynahash for an entire connection or

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: Neil Conway <neilc(at)samurai(dot)com>
Cc: Tom Dunstan <pgsql(at)tomd(dot)cc>, Volkan YAZICI <yazicivo(at)ttnet(dot)net(dot)tr>, Greg Mitchell <gmitchell(at)atdesk(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Storing a dynahash for an entire connection or
Date: 2006-11-27 22:04:22
Message-ID: 456B60E6.5010307@dunslane.net (view raw or flat)
Thread:
Lists: pgsql-hackers
Neil Conway wrote:
> On Mon, 2006-11-27 at 20:11 +0000, Tom Dunstan wrote:
>   
>> That's the obvious solution (or perhaps in CurTransactionContext), but 
>> when the function is called in a subsequent transaction, how does it 
>> determine that the static pointer was allocated from a context which has 
>> since vanished?
>>     
>
> If you're content with your allocations never being automatically
> released for the duration of the session (which sounds like the behavior
> Greg would like, I'm guessing), you can just allocate the hash table in
> TopMemoryContext, in which case you wouldn't need to worry about the
> context of allocation vanishing beneath your feet.
>
>   

Maybe I have misunderstood, but I don't see in this case how to 
determine that the cached data is still valid.

cheers

andrew

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