Request for documentation of PID handling functions

[David Howells]

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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