[GHC] #2637: conc032(threaded2) fails with "thread blocked indefinitely"

[GHC]

#2637: conc032(threaded2) fails with "thread blocked indefinitely"
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  simonmar        
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:  6.10.1          
   Component:  Runtime System    |     Version:  6.8.3           
    Severity:  normal            |    Keywords:                  
  Difficulty:  Unknown           |    Testcase:  conc032         
Architecture:  Unknown/Multiple  |          Os:  Unknown/Multiple
---------------------------------+------------------------------------------
 There's a race condition in `throwTo` where the target thread is running
 but just about to complete, so we end up with the source thread blocked on
 a `ThreadFinished` thread, and this is never noticed.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2637>
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