[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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Comment(by adept):

 Well, apart from THREADED_RTS everything else will be available via Rts.h
 -> MachDeps.h -> ghcautoconf.h, is it not?

 Contents of the dist-install/build/System/Posix/Signals.hs support my
 theory: note that in the absence of needed defines, the whole {{{#if ..
 #endif}}} block would evaluate to empty. However, on my notebook, it
 evaluates to the (proper) value of {{{virtualTimerExpired}}}.

 However, I agree that at the very least, check for
 {{{defined(THREADED_RTS)}}} should be removed. Modified patch will be
 attached after this comment.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4504#comment:7>
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