darcs patch: Fix to Semaphore newMutex. (and 2 more)

[Tony Garnock-Jones]

Tue Jan  3 17:42:43 GMT 2006  Tony Garnock-Jones <tonyg at lshift.net>
  * Fix to Semaphore newMutex.

Tue Jan  3 17:42:56 GMT 2006  Tony Garnock-Jones <tonyg at lshift.net>
  * Add mutex-controlled critical-section method, critical:.

Tue Jan  3 17:43:21 GMT 2006  Tony Garnock-Jones <tonyg at lshift.net>
  * SharedQueue implementation.
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