From: Namhyung Kim <namhyung@gmail.com>
To: Balachandar <bala1486@gmail.com>
Cc: kernelnewbies@nl.linux.org, linux-c-programming@vger.kernel.org
Subject: Re: Use of double pointer in linux kernel Hash list implementation
Date: Thu, 17 Jun 2010 12:32:25 +0900 [thread overview]
Message-ID: <1276745545.1712.8.camel@leonhard> (raw)
In-Reply-To: <AANLkTilGln3yZRl1muugML4Qg_1rcTXTf3UeAIzLTOJT@mail.gmail.com>
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2010-06-16 (수), 22:50 -0400, Balachandar:
> Hi,
> I am trying to understand Linux Kernel implementation of linked list
> and hash table. A link to the implementation is here. I understood the
> linked list implementation. But i am little confused of why double
> pointers is being used in hlist (**pprev). Link for hlist is here. I
> understand that hlist is used in implementation of hash table since
> head of the list requires only one pointer and it saves space. Why
> cant it be done using single pointer (just *prev like the linked
> list)? Please help me.
>
>
> Thanks,
> Bala
IMHO **pprev is only needed for fast deletion and/or insertion.
--
Regards,
Namhyung Kim
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next prev parent reply other threads:[~2010-06-17 3:32 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-17 2:50 Use of double pointer in linux kernel Hash list implementation Balachandar
2010-06-17 3:32 ` Namhyung Kim [this message]
2010-06-17 14:34 ` Balachandar
2010-06-18 2:10 ` Namhyung Kim
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