[GHC] #13944: Introduce synchronized FFI

[GHC]

#13944: Introduce synchronized FFI
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        Reporter:  winter            |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
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 winter):

 > I'll assume by "it" you mean the thread-state save. I don't believe it
 is possible; afterall, there may be thread state (which may contain
 reference to heap objects) sitting in machine registers.

 Yes, i mean all the thread pause stuff. I want to understand what is the
 minimum preparation before we can make FFI calls which doesn't get in GC's
 way. I believe this helps to reduce GC pause.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13944#comment:9>
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