[GHC] #13452: Lock .tix file

[GHC]

#13452: Lock .tix file
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Code Coverage     |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ramirez7):

 A related question: If I have multiple Haskell green threads (in the same
 process) in my tests, are the updates to the {{{tix}}} files thread-safe?
 I couldn't find any statement on the matter in the documentation.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13452#comment:5>
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