[GHC] #9656: Process and thread init/deinit hooks for C libraries

[GHC]

#9656: Process and thread init/deinit hooks for C libraries
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              Reporter:  3noch       |            Owner:
                  Type:  feature     |           Status:  closed
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.8.3
             Component:  Compiler    |         Keywords:  FFI
            Resolution:  invalid     |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by 3noch):

 The mysql package punts on this issue because it uses the single-threaded
 lib, so it can get away without calling most of the init/deinit functions
 manually. One issue is that the main library init function is not thread
 safe so must be called before any threads are created (or mutex
 protected). In a C program, this is easily done by adding a few calls in
 main. The trouble when connecting Haskell apps to these libraries is that
 we don't have that kind of access to "main" and thus have to come up with
 awkward APIs and monads, etc. to make sure everything happens properly. Of
 course, as I said, it's possible to do this in user-land, its just painful
 and makes Haskell less friendly in real-world scenarios where you want to
 interop with stuff like this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9656#comment:2>
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