[GHC] #2808: createDirectoryIfMissing should be atomic

[GHC]

#2808: createDirectoryIfMissing should be atomic
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    Reporter:  EricKow              |        Owner:  simonmar        
        Type:  bug                  |       Status:  new             
    Priority:  normal               |    Milestone:  6.10.2          
   Component:  libraries/directory  |      Version:  6.10.1          
    Severity:  normal               |   Resolution:                  
    Keywords:                       |   Difficulty:  Unknown         
    Testcase:                       |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple     |  
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Changes (by igloo):

  * milestone:  => 6.10.2

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2808#comment:4>
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