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Added extra explanation from Felipe

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Michael Snoyman 2012-11-07 14:49:11 +02:00
parent a144b56928
commit ae8168ede5
1 changed files with 4 additions and 0 deletions
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yesod-core/Yesod/Handler.hs
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@ -1038,6 +1038,10 @@ instance MonadBase IO (GHandler sub master) where
-- @fork@ function is incompatible with the underlying @ResourceT@ system. -- @fork@ function is incompatible with the underlying @ResourceT@ system.
-- Instead, if you must fork a separate thread, you should use -- Instead, if you must fork a separate thread, you should use
-- @resourceForkIO@. -- @resourceForkIO@.
--
-- Using fork usually leads to an exception that says
-- \"Control.Monad.Trans.Resource.register\': The mutable state is being accessed
-- after cleanup. Please contact the maintainers.\"
instance MonadBaseControl IO (GHandler sub master) where instance MonadBaseControl IO (GHandler sub master) where
data StM (GHandler sub master) a = StH (StM (ResourceT IO) a) data StM (GHandler sub master) a = StH (StM (ResourceT IO) a)
liftBaseWith f = GHandler $ \reader -> liftBaseWith f = GHandler $ \reader ->