[GHC] #15768: Using oneshot kqueue() on macOS

[GHC]

#15768: Using oneshot kqueue() on macOS
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        Reporter:  kazu-yamamoto     |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  highest           |            Milestone:  8.8.1
       Component:  Core Libraries    |              Version:  8.6.1
      Resolution:                    |             Keywords:  KQueue,
                                     |  oneshot, parallel build
Operating System:  MacOS X           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by kazu-yamamoto):

 kqueue() is used on MacOS and BSD variants. But when we implemented Mio,
 we only tested it on MacOS and Linux.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15768#comment:3>
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