[GHC] #4934: threadWaitRead works incorrectly on nonthreaded RTS

[GHC]

#4934: threadWaitRead works incorrectly on nonthreaded RTS
------------------------------------------------+--------------------------
        Reporter:  slyfox                       |            Owner:
            Type:  bug                          |           Status:  patch
        Priority:  normal                       |        Milestone:  ⊥
       Component:  Runtime System               |          Version:  7.0.1
      Resolution:                               |         Keywords:
Operating System:  Linux                        |     Architecture:  x86_64
 Type of failure:  Incorrect result at runtime  |  (amd64)
       Test Case:                               |       Difficulty:
        Blocking:                               |  Unknown
                                                |       Blocked By:
                                                |  Related Tickets:
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Changes (by slyfox):

 * status:  new => patch


Comment:

 Now even with non-threaded RTS error is reported as expected:

 {{{
 $ inplace/bin/ghc-stage2 --make -fforce-recomp a.hs -o a -debug && ./a
 a: awaitEvent: invalid argument (Bad file descriptor)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4934#comment:20>
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