[GHC] #1036: Asynchronous exceptions improvements

[GHC]

#1036: Asynchronous exceptions improvements
---------------------------------+------------------------------------------
    Reporter:  simonmar          |       Owner:  simonmar
        Type:  task              |      Status:  new     
    Priority:  normal            |   Milestone:  _|_     
   Component:  Compiler          |     Version:  6.6     
    Severity:  normal            |    Keywords:          
  Difficulty:  Moderate (1 day)  |    Testcase:          
Architecture:  Unknown           |          Os:  Unknown 
---------------------------------+------------------------------------------
There was some discussion about asynchronous exceptions on the haskell-
 prime list, eg.

  * [http://www.haskell.org/pipermail/haskell-prime/2006-April/001280.html]
  * [http://www.haskell.org/pipermail/haskell-prime/2006-April/001290.html]

 We might want to consider adding

 {{{
 blockAll :: IO () -> IO ()
 }}}

 and perhaps making `block`/`unblock` count nesting.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1036>
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