[GHC] #8972: Investigate adding fast compare-and-swap Int type/primops

[GHC]

#8972: Investigate adding fast compare-and-swap Int type/primops
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        Reporter:  tibbe             |            Owner:  tibbe
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:  7.10.1
       Component:  Compiler          |          Version:  7.9
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #8157, #7883
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Comment (by jberryman):

 Replying to [comment:10 nominolo]:

 > For GHC, I think it could be useful to have both mechanisms available.
 Marking a thread as non-interruptable could be exported from a "Here be
 dragons" module for using when you know that a thread will hold a
 lock/MVar only for a very short time.
 >

 Would this be something like `mask` but for scheduling? If so I want. From
 a library-writers point of view this would be a really easy way to get rid
 of a lot of bad scheduling effects, e.g. in probably every use of
 `modifyMVar`. Sorry if I'm not understanding.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8972#comment:12>
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