From: | Julien Rouhaud <julien(dot)rouhaud(at)dalibo(dot)com> |
---|---|
To: | hariprasath nallasamy <hariprasathnallasamy(at)gmail(dot)com>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: Difficult while acquiring LWLocks |
Date: | 2017-05-03 12:43:37 |
Message-ID: | 46c8d952-48e5-719f-364c-e1a311817d3f@dalibo.com |
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Lists: | pgsql-general |
On 03/05/2017 13:08, hariprasath nallasamy wrote:
> Hi all
> There is an use case, where i want some 10 LightWeight Locks and
> after 9.6 LW locks api's (LWLockAssign) are changed a bit and i am
> confused too.
>
> Only reference i cant get was from pg_stat_statement :(
>
> Since GetNamedLWLockTranche method will return the base address of the
> specified tranche.
>
> From pg_init
> *" RequestNamedLWLockTranche("Some_10_LWLocks", 10); "
>
>
> *For getting those locks which were requested from pg_init
> *" LWLockPadded *lwLockPadded = GetNamedLWLockTranche("Some_10_LWLocks");
> LWLock *lock = &(lwLockPadded[index in 0 to 9]).lock; "*
>
> Is the above code snippet a valid for requesting some 10 LWLocks?
>
>
AFAIK yes this is the correct way to use multiple lwlocks.
--
Julien Rouhaud
http://dalibo.com - http://dalibo.org
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