Ok, good. That means that "sys_set_userpid()" is fine with me.
That still leaves the other part of the patch. I do not think that SETTID
and CLEARTID should be mixed together. There are perfectly valid reasons
why a parent wants SETTID even when it _doesn't_ want CLEARTID.
In fact, SETTID is clearly useful even without threads, and exactly for
the case that Ingo apparently broke with his patch: the parent wants to
atomically save the TID of the child in the _parents_ address space (so
that a immediate SIGCHLD won't be racy with saving off the pid by the
parent).
So Ingo, please send me just the sys_set_userpid() parts, and revert your
broken code that made SETTID do bad things and only work for threads.
There's no reason to make SETTID/CLEARTID be one flag, since they are
clearly different things, and NPTL can just always set both bits if that
is the behaviour glibc wants (and I agree with that behaviour, of course.
I just disagree with not allowing others to do different things).
Linus
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