Robust futexes

[Rusty Russell]

Hi Ingo, all,

	Noticed (via LWN, hence the delay) your robust futex work.  Have you
considered the less-perfect, but simpler option of simply having futex
calls which tell the kernel that the u32 value is in fact the holder's
TID?

	In this case, you don't get perfect robustness when TID wrap occurs:
the kernel won't know that the lock holder is dead.  However, it's
simple, and telling the kernel that the lock is the tid allows the
kernel to do prio inheritence etc. in future.

Cheers!
Rusty.
-- 
 ccontrol: http://ozlabs.org/~rusty/ccontrol

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