#5902: Cannot tell from an exception handler whether the exception was asynchronous -------------------------------------+------------------------------------ Reporter: simonmar | Owner: simonmar Type: bug | Status: new Priority: high | Milestone: 7.8.1 Component: Compiler | Version: 7.4.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by exbb2): Replying to [comment:19 simonmar]:
Every innocuous catch or try anywhere at any time in any library can make a thread unintentionally uncancelable I'm not sure what you mean here. The issue in this ticket only arises when using `unsafePerformIO`.
{{{ tryNTimes n | n <= 0 = return () | otherwise = forever (return ()) `catch` \(_::SomeException) -> tryNTimes (n - 1) }}} or {{{ try something :: IO (Either SomeException x) }}} Catching SomeException is sometimes reasonable, but it's unreasonable not to provide ability to discriminate against irrelevant asynchronous exceptions which do not directly follow from handled code. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/5902#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler