Message-ID: <414EC805.8070105@sw.ru>
Date: Mon, 20 Sep 2004 16:07:33 +0400
From: Kirill Korotaev <dev@sw.ru>
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To: William Lee Irwin III <wli@holomorphy.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: [Q] why switch_exec_pids() changes thread group leader pid?
References: <414EBF2B.5090909@sw.ru> <20040920114616.GT9106@holomorphy.com>
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William Lee Irwin III wrote:
> On Mon, Sep 20, 2004 at 03:29:47PM +0400, Kirill Korotaev wrote:
> 
>>I've been looking through switch_exec_pids() function and found that it 
>>changes thread group leader PID/TGID. Is it really a good idea to change 
>> pid of the process during it's lifetime? I could understand if it was 
>>happenning in the context of that process, but pid changes everytime a 
>>thread calls do_execve().
>>As far as I can see, leader doesn't have to do any of detach_pid()'s. 
>>Instead thread should change it's PID/TGID.
> 
> 
> It's only done when a thread that is not a thread group leader
> execve()'s. This is actually pretty rare and confined to threaded
> applications, so it should be almost never called.
Heh, rare doesn't mean correct, yeah? :)

Kirill

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