[GHC] #4363: openFile sharing permissions are inconsistent across platforms

[GHC]

#4363: openFile sharing permissions are inconsistent across platforms
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    Reporter:  jystic            |        Owner:                             
        Type:  bug               |       Status:  new                        
    Priority:  normal            |    Milestone:                             
   Component:  libraries/base    |      Version:  6.12.3                     
    Keywords:                    |     Testcase:                             
   Blockedby:                    |   Difficulty:                             
          Os:  Windows           |     Blocking:                             
Architecture:  Unknown/Multiple  |      Failure:  Incorrect result at runtime
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Comment(by simonmar):

 The Haskell standard requires us to implement single-writer/multiple-
 reader locking, which is what the above code is doing.  Unfortunately the
 locking extends outside the process, which is unfortunate (but is in the
 spirit of the Haskell locking requirement).

 One reason for the locking is so that you can't open a file for writing
 that you also have open for lazy I/O.  However, there are other ways to
 achieve unexpected results with lazy I/O.  My personal view is that this
 locking has caused more trouble and surprising behaviour than it saves,
 and we should just default to whatever locking semantics the OS provides.
 I'd be interested to hear what others think about this.  Maybe we could do
 a Haskell 2011/2012 proposal to get it changed, and in the meantime we
 could change it in GHC too.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4363#comment:4>
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