select(2) converted to use a condition variable, and optimised

[Seigo Tanimura]

As conversion of select(2) from msleep(9) to a condition variable is
in the SMPng TODO list, I have done that task.

Also, we do not have to lock a process in order to evaluate the result
of {sel,poll}scan() and the remaining time of {select,poll}(2). It
should be enough to do those pieces of work first, followed by locking
a process and wait for a condition variable or selwakeup().

Those changes are in the patch at:

http://people.FreeBSD.org/~tanimura/patches/selectopt.diff

-- 
Seigo Tanimura <[EMAIL PROTECTED]> <[EMAIL PROTECTED]>

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