[GHC] #1692: GLUT timedCallback fires twice

[GHC]

#1692: GLUT timedCallback fires twice
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    Reporter:  richardg at richardg.name  |        Owner:         
        Type:  bug                     |       Status:  new    
    Priority:  normal                  |    Milestone:         
   Component:  libraries (other)       |      Version:  6.6.1  
    Severity:  normal                  |   Resolution:         
    Keywords:                          |   Difficulty:  Unknown
          Os:  MacOS X                 |     Testcase:         
Architecture:  x86                     |  
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Comment (by richardg at richardg.name):

 The issue only appears when tickLength is ~990 or higher (i.e., the
 callback is scheduled for ~990+ ms into the future).  If the value is
 reduced to 950 or less, the problem doesn't appear.

 The threshold could vary between systems; in particular, slower systems
 may experience the issue at lower values.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1692>
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