[GHC] #4154: Deadlock in Chan module

[GHC]

#4154: Deadlock in Chan module
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  Reporter:  NeilMitchell                 |          Owner:                  
      Type:  bug                          |         Status:  closed          
  Priority:  high                         |      Milestone:  7.0.1           
 Component:  libraries/base               |        Version:  6.12.3          
Resolution:  fixed                        |       Keywords:                  
  Testcase:                               |      Blockedby:                  
Difficulty:                               |             Os:  Unknown/Multiple
  Blocking:                               |   Architecture:  Unknown/Multiple
   Failure:  Incorrect result at runtime  |  
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Changes (by mitar):

 * cc: mmitar@… (added)


Comment:

 The only case where I have been using `isEmptyChan` was in my version of
 non-blocking `readChan`, returning Maybe. Is it possible to define instead
 of `isEmptyChan` some non-blocking version of `readChan` with
 `tryTakeMVar` and `tryPutMVar`?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4154#comment:5>
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