darcs patch: Fix semaphore implementation to *not* sh... (and 1 more)

[Tony Garnock-Jones]

Wed May  3 20:10:02 BST 2006  Tony Garnock-Jones <tonyg at kcbbs.gen.nz>
  * Fix semaphore implementation to *not* share a global waiters queue. Sigh.
  
  Mutable state considered harmful? :-( This bug has been present since
  my first submission of the semaphore code. All the hypothetical faults with
  ensure: and friends were red herrings!

Wed May  3 20:16:25 BST 2006  Tony Garnock-Jones <tonyg at kcbbs.gen.nz>
  * Remove debugging print statements from sharedqueue.
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