Date: Mon, 20 Sep 2004 04:46:16 -0700
From: William Lee Irwin III <wli@holomorphy.com>
To: Kirill Korotaev <dev@sw.ru>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [Q] why switch_exec_pids() changes thread group leader pid?
Message-ID: <20040920114616.GT9106@holomorphy.com>
References: <414EBF2B.5090909@sw.ru>
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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.


-- wli
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