Re: Add pselect, ppoll system calls.

[Mattias Engdegård]

> I think passing const struct timeval * or const struct timespec *
> (depending if you want micro or nanoseconds) is better and what
> other functions use for timeouts, then passing int64_t.

If we can design ppoll() any way we like, which seems likely, I would
prefer having the timeout given as an absolute timestamp. It would
save some gettimeofday() (or clock_gettime()) syscalls and simplify
user code in common cases.

If I'm not mistaken, sem_timedwait() and pthread_cond_timedwait() were
designed to take an absolute timeout for this reason.
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