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

[GHC]

#4504: "awaitSignal Nothing" does not block thread with -threaded
------------------------------------------+---------------------------------
  Reporter:  adept                        |          Owner:  adept           
      Type:  bug                          |         Status:  closed          
  Priority:  normal                       |      Milestone:  7.2.1           
 Component:  Runtime System               |        Version:  7.0.1           
Resolution:  fixed                        |       Keywords:                  
  Testcase:                               |      Blockedby:                  
Difficulty:                               |             Os:  Unknown/Multiple
  Blocking:                               |   Architecture:  Unknown/Multiple
   Failure:  Incorrect result at runtime  |  
------------------------------------------+---------------------------------

Comment(by simonmar):

 Replying to [comment:15 kazu-yamamoto]:
 > Why are these patch applied only to GHC HEAD? Why don't you apply these
 to ghc-7.0 branch?

 It's an API addition, and we don't normally change APIs on the stable
 branch.  If this is important to you we could make an exception, though.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4504#comment:16>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler