darcs patch: Add "Scheduler criticalSection:". (and 2 more)

[Tony Garnock-Jones]

Tue Jan  3 17:00:25 GMT 2006  Tony Garnock-Jones <tonyg at lshift.net>
  * Add "Scheduler criticalSection:".

Tue Jan  3 17:00:41 GMT 2006  Tony Garnock-Jones <tonyg at lshift.net>
  * Simple counting-Semaphore implementation.

Tue Jan  3 17:06:02 GMT 2006  Tony Garnock-Jones <tonyg at lshift.net>
  * Simple example of Semaphore usage.
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