[GHC] #4001: Implement an atomic readMVar

[GHC]

#4001: Implement an atomic readMVar
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    Reporter:  simonmar          |        Owner:                            
        Type:  task              |       Status:  new                       
    Priority:  normal            |    Milestone:  7.0.1                     
   Component:  Runtime System    |      Version:  6.12.2                    
    Keywords:                    |     Testcase:                            
   Blockedby:                    |   Difficulty:  Moderate (less than a day)
          Os:  Unknown/Multiple  |     Blocking:                            
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown              
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Comment(by ezyang):

 Some relevant discussion here:

 http://www.mail-archive.com/haskell-cafe@haskell.org/msg04677.html
 http://www.mail-archive.com/glasgow-haskell-
 users at haskell.org/msg15389.html
 http://www.mail-archive.com/haskell-cafe@haskell.org/msg02127.html

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4001#comment:3>
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