#2560: killThread and getChanContents appear to interact strangely
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Reporter: batterseapower | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 6.10.2
Component: Runtime System | Version: 6.9
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by igloo):
OK, I think the problem is that
{{{
readChan = modifyMVar ...
}}}
and
{{{
modifyMVar :: MVar a -> (a -> IO (a,b)) -> IO b
modifyMVar m io =
block $ do
a <- takeMVar m
(a',b) <- unblock (io a) `onException` putMVar m a
putMVar m a'
return b
}}}
so although you are calling `readChan` with exceptions blocked, they are
being unblocked by the library.
I'm not sure what the best solution is.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2560#comment:3>
GHC <http://www.haskell.org/ghc/>
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