linux-kernel - Request for documentation of PID handling functions

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Message-ID: <21590.1217285986@redhat.com>
Date:	Mon, 28 Jul 2008 23:59:46 +0100
From:	David Howells <dhowells@...hat.com>
To:	Pavel Emelyanov <xemul@...nvz.org>
cc:	dhowells@...hat.com, jmorris@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Request for documentation of PID handling functions


Hi Pavel,

Can you please provide documentation for the PID handling functions you
supplied in commit:

	7af5729474b5b8ad385adadab78d6e723e7655a3

In particular I'd like to know what locks are required when.  I'm trying to
determine if in this piece of code:

		read_lock(&tasklist_lock);
		ret = 0;
		if (pid != task_pid_vnr(current))
			ret = -EPERM;
		read_unlock(&tasklist_lock);

the lock of tasklist_lock is necessary.

David
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