[GHC] #4504: "awaitSignal Nothing" does not block thread with -threaded

[GHC]

#4504: "awaitSignal Nothing" does not block thread with -threaded
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    Reporter:  adept             |       Owner:                             
        Type:  bug               |      Status:  new                        
    Priority:  normal            |   Component:  Runtime System             
     Version:  7.0.1             |    Keywords:                             
    Testcase:                    |   Blockedby:                             
          Os:  Unknown/Multiple  |    Blocking:                             
Architecture:  Unknown/Multiple  |     Failure:  Incorrect result at runtime
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Changes (by kazu-yamamoto):

 * cc: kazu@… (added)


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4504#comment:2>
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