linux-kernel - Re: [PATCH 2/3] signalfd: add ability to choose a private or shared queue

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Date:	Fri, 8 Feb 2013 01:35:14 +0100
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrey Vagin <avagin@...nvz.org>, linux-kernel@...r.kernel.org,
	criu@...nvz.org, linux-fsdevel@...r.kernel.org,
	linux-api@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH 2/3] signalfd: add ability to choose a private or shared queue

On Thu, Feb 7, 2013 at 7:17 PM, Oleg Nesterov <oleg@...hat.com> wrote:
> AOn 01/22, Andrey Vagin wrote:
>>
>> This patch is added two flags SFD_SHARED_QUEUE and SFD_PER_THREAD_QUEUE
>> SFD_SHARED_QUEUE
>
> I can't believe I am going to blame the naming ;) but these 2 do not look
> "symmetrical"....
>
> SFD_PRIVATE_QUEUE looks a little bit better to me. At least it is simpler
> to type. But I am fine either way.

At the risk of bikeshedding.... The point is that there are two
queues, the process-wide queue or the per-thread queue. "Private" does
not come into. And "Shared" is a little confusing. Adding those two
terms into the mix is just confusing: it doesn't fit with the
user-space view of signals.

I'd greatly prefer names that really say what these things are. Thus:

SFD_PROCESS_QUEUE + SFD_THREAD_QUEUE
or
SFD_PROCESS_WIDE_QUEUE + SFD_PER_THREAD_QUEUE
or
SFD_PROCESS_Q + SFD_THREAD_Q
or
[some consistent variation of the above]

Thanks,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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