[GHC] #10317: Event manager: Multishot registrations only fire once

[GHC]

#10317: Event manager: Multishot registrations only fire once
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              Reporter:  bgamari     |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:  7.10.2
             Component:  Compiler    |           Version:  7.10.1
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  Incorrect result
  Unknown/Multiple                   |  at runtime
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
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 Since D347 the event manager has had support for multishot event
 registration semantics, allowing the user to receive multiple events on an
 fd without requiring re-registration.

 Unfortunately the implementation drops the registration after it fires,
 resulting in only one callback invocation.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10317>
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