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Warning about fork vs resourceForkIO

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Michael Snoyman 2012-11-07 14:35:31 +02:00
parent ed5e65ae95
commit a144b56928
1 changed files with 4 additions and 0 deletions
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yesod-core/Yesod/Handler.hs
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@ -1034,6 +1034,10 @@ instance MonadIO (GHandler sub master) where
liftIO = GHandler . const . lift liftIO = GHandler . const . lift
instance MonadBase IO (GHandler sub master) where instance MonadBase IO (GHandler sub master) where
liftBase = GHandler . const . lift liftBase = GHandler . const . lift
-- | Note: although we provide a @MonadBaseControl@ instance, @lifted-base@'s
-- @fork@ function is incompatible with the underlying @ResourceT@ system.
-- Instead, if you must fork a separate thread, you should use
-- @resourceForkIO@.
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 ->