[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:  adept                      
        Type:  bug               |       Status:  patch                      
    Priority:  normal            |    Milestone:  7.2.1                      
   Component:  Runtime System    |      Version:  7.0.1                      
    Keywords:                    |     Testcase:                             
   Blockedby:                    |   Difficulty:                             
          Os:  Unknown/Multiple  |     Blocking:                             
Architecture:  Unknown/Multiple  |      Failure:  Incorrect result at runtime
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Changes (by adept):

  * status:  new => patch


Comment:

 Attached patch should fix this. Please review.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4504#comment:5>
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