[GHC] #8010: Add forkOSUnmasked (patch)

[GHC]

#8010: Add forkOSUnmasked (patch)
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Reporter:  joeyadams         |          Owner:                  
    Type:  feature request   |         Status:  new             
Priority:  normal            |      Component:  libraries/base  
 Version:  7.7               |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
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 This patch simply adds `forkOSUnmasked` to Control.Concurrent:

 {{{
 -- | Like 'forkIOWithUnmask', but the child thread is a bound thread,
 -- as with 'forkOS'.
 forkOSWithUnmask :: ((forall a . IO a -> IO a) -> IO ()) -> IO ThreadId
 forkOSWithUnmask io = forkOS (io unsafeUnmask)
 }}}

 I ran `sh validate`, and no new failures were introduced.  I'll push it to
 master in a few days, unless someone objects.

 For GHC < 7.8, `forkOSWithUnmask` can be achieved using `forkOS` and
 [http://hackage.haskell.org/packages/archive/base/4.6.0.1/doc/html
 /Control-Exception.html#v:block block], but `block` is removed in GHC 7.8.
 `unsafeUnmask` can still be imported from `GHC.IO`, however.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/8010>
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