CLONE_DETACHED and exit notification (was user-vm-unlock-2.5.31-A2)

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Ingo Molnar wrote:
> Why is CLONE_DETACHED such a big problem for you, why do you want to force
> a more expensive notification method?

Eh? I _like_ CLONE_DETACHED, and I want notification cheaper, not
more expensive.

You've said that pthread_exit() _always_ notifies a sibling thread using
a futex.

Well, can we please move the futex wakeup into the kernel? That is all
I ask. It will make pthread_exit() _faster_, and me happy because
all exits are notified.

-- Jamie
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