[Patch] C1X threading support

[Poul-Henning Kamp]

In message <86vcp8sfld.fsf at ds4.des.no>, =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= wr
ites:

>There is no such thing as a kernel in the C standard.  All it knows
>about is the implementation and the program.  The best solution would
>probably have been a timescale that counts the time elapsed since the
>start of the program.

That is requiring far more than necessary:  All that is needed is
a monotonic timescale, such as the, precisely named, CLOCK_MONOTONIC
timescale POSIX introduced to solve the exact same kind of issues.

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