That's clear. But I just changed my mind 8)
Because if you're going to demux the syscall, it might be worth
looking at FUTEX_FD: an "expected val" arg there might be worthwhile,
because to use it currently I think NPTL does:
try to get futex
fd = sys_futex(FUTEX_FD...)
try to get futex again because of race
Have the futex_fd act like futex_wait, ie. return -EWOULDBLOCK if the
value != expected value.
> all that is needed now is some actual review of the new APIs from the
> conceptual angle (i've done that and i think they are okay, but more eyes
> see more), so that we make sure these are good and we wont need to discard
> any aspect of them anytime soon.
Sorry, I didn't comment because I thought your explanation, concept,
analysis and code were all very neat.
Thanks,
Rusty.
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