linux-kernel - Re: [PATCH] ptrace: add ability to get clear_tid

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Message-ID: <4F31848A.9070406@redhat.com>
Date:	Tue, 07 Feb 2012 20:07:38 +0000
From:	Pedro Alves <palves@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Pavel Emelyanov <xemul@...allels.com>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	Tejun Heo <tj@...nel.org>, Andrew Vagin <avagin@...nvz.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH] ptrace: add ability to get clear_tid_address

On 02/03/2012 04:51 PM, Oleg Nesterov wrote:
> On 02/03, Pavel Emelyanov wrote:

>> Because there's no need for current to get this value of himself, but can
>> be useful for e.g. gdb.
> 
> OK, perhaps this makes sense, I do not know.
> 
> Jan, Pedro, do you think gdb can use PTRACE_GET_TID_ADDRESS (returns
> tracee->clear_child_tid) ?

Off hand, I'm not picturing a use.  But that may well just mean I'm lacking
imagination.  Andrew, Pavel, did you have a particular idea in mind when you
said it may be useful for debugging a multithreading program / gdb?

-- 
Pedro Alves
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