#15312: getChanContents exception behavior seems a bit odd -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Core Libraries | Version: 8.4.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): The basic problem seems to be that `readChan` uses `modifyMVar`, which uses `onException`, which catches arbitrary exceptions and rethrows them as synchronous exceptions: {{{#!hs onException :: IO a -> IO b -> IO a onException io what = io `catch` \e -> do _ <- what throwIO (e :: SomeException) }}} I don't think `readChan` can throw any synchronous exceptions, so perhaps it should rethrow any exceptions it receives asynchronously and retry. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15312#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler