[GHC] #1047: Increase gurantees of semantics of block/unblock/throwTo

[GHC]

#1047: Increase gurantees of semantics of block/unblock/throwTo
------------------------------+---------------------------------------------
 Reporter:  ChrisKuklewicz    |          Owner:  igloo   
     Type:  merge             |         Status:  new     
 Priority:  normal            |      Milestone:  6.6.1   
Component:  Runtime System    |        Version:  6.6     
 Severity:  normal            |     Resolution:          
 Keywords:  concurrency       |     Difficulty:  Unknown 
 Testcase:  conc065, conc066  |   Architecture:  Multiple
       Os:  Multiple          |  
------------------------------+---------------------------------------------
Changes (by simonmar):

  * status:  reopened => new
  * owner:  simonmar => igloo

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1047>
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