Undo previous lwp.h change.

Split __lwp_getprivate_fast and __lwp_*tcb from mcontext.h into a separate
lwp.h file.

make _lwp_park return the remaining time to sleep in the "ts" argument
if it is a relative timestamp, as discussed in tech-kern.
XXX: pullup-8

__lwp_park60

merge christos-time_t

Remove clause 3 and 4 from TNF licenses

Add _lwp_ctl() - sorry, I thought I had checked this in yesterday along
with makelintstub.

Add _lwp_setname, _lwp_getname.

Change the signature of _lwp_park() to accept an lwpid_t and second
hint pointer, but do so in a way that remains compatible with older
pthread libraries. This can be used to wake another thread befo

Change the signature of _lwp_park() to accept an lwpid_t and second
hint pointer, but do so in a way that remains compatible with older
pthread libraries. This can be used to wake another thread before the
calling thread goes asleep, saving at least one syscall + involuntary
context switch. This turns out to be a fairly large win on the condvar
benchmarks that I have tried.

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Change _lwp_unpark_all() to return a 'ssize_t'.

Add: _lwp_kill, _lwp_detach, _lwp_park, lwp_unpark, _lwp_unpark_all.

de-__P -- the hack is long since useless. Discussed with christos,
matt, kleink, others. Approved by christos.

correct the return value type of _lwp_self()

Merge the nathanw_sa branch.