From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: David Howells <dhowells@redhat.com>,
linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
mingo@redhat.com, akpm@osdl.org, torvalds@osdl.org
Subject: Re: [PATCH 1/12]: MUTEX: Implement mutexes
Date: Sat, 17 Dec 2005 18:55:13 +1100 [thread overview]
Message-ID: <43A3C461.2030900@yahoo.com.au> (raw)
In-Reply-To: <1134791914.13138.167.camel@localhost.localdomain>
Steven Rostedt wrote:
> On Fri, 2005-12-16 at 23:13 +0000, David Howells wrote:
>>This patch set does the following:
>>
>> (1) Renames DECLARE_MUTEX and DECLARE_MUTEX_LOCKED to be DECLARE_SEM_MUTEX and
>> DECLARE_SEM_MUTEX_LOCKED for counting semaphores.
>>
>
>
> Could we really get rid of that "MUTEX" part. A counting semaphore is
> _not_ a mutex, although a mutex _is_ a counting semaphore. As is a Jack
> Russell is a dog, but a dog is not a Jack Russell.
>
Really?
A Jack Russell is a dog because anything you say about a dog can
also be said about a Jack Russell.
A counting semaphore is a mutex for the same reason (and observe
that 99% of users use the semaphore as a mutex). A mutex definitely
is not a counting semaphore. David's implementation of mutexes
don't count at all.
If you want to use a semaphore as a mutex, DECLARE_SEM_MUTEX isn't
a terrible name.
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2005-12-17 7:55 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-16 23:13 [PATCH 0/12]: MUTEX: Introduce mutex implementation David Howells
2005-12-16 23:13 ` [PATCH 1/12]: MUTEX: Implement mutexes David Howells
2005-12-17 3:58 ` Steven Rostedt
2005-12-17 7:35 ` Linus Torvalds
2005-12-17 19:21 ` David Howells
2005-12-17 20:11 ` Linus Torvalds
2005-12-17 21:44 ` Russell King
2005-12-18 1:29 ` Nicolas Pitre
2005-12-18 2:34 ` Linus Torvalds
2005-12-18 4:07 ` Nicolas Pitre
2005-12-18 4:18 ` Steven Rostedt
2005-12-18 6:30 ` Linus Torvalds
2005-12-18 9:26 ` Russell King
2005-12-18 18:42 ` Linus Torvalds
2005-12-18 19:41 ` James Bottomley
2005-12-18 19:54 ` Linus Torvalds
2005-12-19 1:48 ` Nicolas Pitre
2005-12-19 9:27 ` Russell King
2005-12-19 13:54 ` Matthew Wilcox
2005-12-19 15:49 ` Nicolas Pitre
2005-12-19 15:45 ` Nicolas Pitre
2005-12-18 17:29 ` Nicolas Pitre
2005-12-18 13:38 ` Alan Cox
2005-12-18 17:21 ` Nicolas Pitre
2005-12-17 7:55 ` Nick Piggin [this message]
2005-12-17 12:36 ` Steven Rostedt
2005-12-16 23:13 ` [PATCH 3/12]: MUTEX: Rename DECLARE_MUTEX for arch/ dir David Howells
2005-12-16 23:13 ` [PATCH 2/12]: MUTEX: Provide SWAP-based mutex for FRV David Howells
2005-12-16 23:13 ` [PATCH 6/12]: MUTEX: Rename DECLARE_MUTEX for fs/ dir David Howells
2005-12-16 23:13 ` [PATCH 7/12]: MUTEX: Rename DECLARE_MUTEX for include/asm-*/ dirs David Howells
2005-12-16 23:13 ` [PATCH 10/12]: MUTEX: Rename DECLARE_MUTEX for sound/ dir David Howells
2005-12-16 23:13 ` [PATCH 9/12]: MUTEX: Rename DECLARE_MUTEX for net/ dir David Howells
2005-12-16 23:13 ` [PATCH 5/12]: MUTEX: Rename DECLARE_MUTEX for drivers/ dir, N thru Z David Howells
2005-12-16 23:13 ` [PATCH 8/12]: MUTEX: Rename DECLARE_MUTEX for kernel/ dir David Howells
2005-12-16 23:13 ` [PATCH 11/12]: MUTEX: Rename DECLARE_MUTEX for miscellaneous directories David Howells
2005-12-16 23:13 ` [PATCH 4/12]: MUTEX: Rename DECLARE_MUTEX for drivers/ dir, A thru M David Howells
2005-12-16 23:13 ` [PATCH 12/12]: MUTEX: Provide synchronisation primitive testing module David Howells
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