[GHC] #2808: createDirectoryIfMissing should be atomic

[GHC]

#2808: createDirectoryIfMissing should be atomic
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    Reporter:  EricKow           |       Owner:                     
        Type:  bug               |      Status:  new                
    Priority:  normal            |   Component:  libraries/directory
     Version:  6.10.1            |    Severity:  normal             
    Keywords:                    |    Testcase:                     
Architecture:  Unknown/Multiple  |          Os:  Unknown/Multiple   
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 If I run createDirectoryIfMissing many times in parallel, it sometimes
 fails because (presumably) somewhere between the check if the directory
 exists, and between the actual creation, something else creates the
 directory.

 Right now my workaround is to catch exceptions with isAlreadyExistsErrors

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