linux-kernel - Re: [RFC][PATCH 0/4] Object creation with a specified id

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Message-ID: <480483C2.3030509@bull.net>
Date:	Tue, 15 Apr 2008 12:30:26 +0200
From:	Nadia Derbey <Nadia.Derbey@...l.net>
To:	Nick Andrew <nick@...k-andrew.net>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, orenl@...columbia.edu
Subject: Re: [RFC][PATCH 0/4] Object creation with a specified id

Nick Andrew wrote:
> On Fri, Apr 04, 2008 at 04:51:29PM +0200, Nadia.Derbey@...l.net wrote:
> 
>>   . echo "LONG XX" > /proc/self/next_id
>>     next object to be created will have an id set to XX
>>   . echo "LONG<n> X0 ... X<n-1>" > /proc/self/next_id
>>     next object to be created will have its ids set to XX0, ... X<n-1>
>>     This is particularly useful for processes that may have several ids if
>>     they belong to nested namespaces.
> 
> 
> How do you handle race conditions, i.e. you specify the ID for the
> next object to be created, and then some other thread goes and creates
> an object before your thread creates one?
> 
> Nick.


Sorry for not answering earlier, I just saw your e-mail!

It's true that the way I've done things, the "create_with_id" doesn't 
take into account multi-threaded apps, since "self" is related to the 
thread group leader.

May be using something like /proc/self/task/<my_tid>/next_id would be 
better, but I have to think more about it...

Regards,
Nadia
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