diff options
Diffstat (limited to 'libraries/base/GHC/Event/Internal.hs')
| -rw-r--r-- | libraries/base/GHC/Event/Internal.hs | 36 |
1 files changed, 26 insertions, 10 deletions
diff --git a/libraries/base/GHC/Event/Internal.hs b/libraries/base/GHC/Event/Internal.hs index 9b8230c032..5778c6f3fe 100644 --- a/libraries/base/GHC/Event/Internal.hs +++ b/libraries/base/GHC/Event/Internal.hs @@ -36,10 +36,11 @@ import GHC.Base import GHC.Word (Word64) import GHC.Num (Num(..)) import GHC.Show (Show(..)) +import Data.Semigroup.Internal (stimesMonoid) -- | An I\/O event. newtype Event = Event Int - deriving (Eq) + deriving Eq -- ^ @since 4.4.0.0 evtNothing :: Event evtNothing = Event 0 @@ -63,7 +64,7 @@ evtClose = Event 4 eventIs :: Event -> Event -> Bool eventIs (Event a) (Event b) = a .&. b /= 0 --- | @since 4.3.1.0 +-- | @since 4.4.0.0 instance Show Event where show e = '[' : (intercalate "," . filter (not . null) $ [evtRead `so` "evtRead", @@ -72,10 +73,14 @@ instance Show Event where where ev `so` disp | e `eventIs` ev = disp | otherwise = "" --- | @since 4.3.1.0 +-- | @since 4.10.0.0 +instance Semigroup Event where + (<>) = evtCombine + stimes = stimesMonoid + +-- | @since 4.4.0.0 instance Monoid Event where mempty = evtNothing - mappend = evtCombine mconcat = evtConcat evtCombine :: Event -> Event -> Event @@ -92,7 +97,9 @@ evtConcat = foldl' evtCombine evtNothing data Lifetime = OneShot -- ^ the registration will be active for only one -- event | MultiShot -- ^ the registration will trigger multiple times - deriving (Show, Eq) + deriving ( Show -- ^ @since 4.8.1.0 + , Eq -- ^ @since 4.8.1.0 + ) -- | The longer of two lifetimes. elSupremum :: Lifetime -> Lifetime -> Lifetime @@ -100,24 +107,33 @@ elSupremum OneShot OneShot = OneShot elSupremum _ _ = MultiShot {-# INLINE elSupremum #-} +-- | @since 4.10.0.0 +instance Semigroup Lifetime where + (<>) = elSupremum + stimes = stimesMonoid + -- | @mappend@ takes the longer of two lifetimes. -- -- @since 4.8.0.0 instance Monoid Lifetime where mempty = OneShot - mappend = elSupremum -- | A pair of an event and lifetime -- -- Here we encode the event in the bottom three bits and the lifetime -- in the fourth bit. newtype EventLifetime = EL Int - deriving (Show, Eq) + deriving ( Show -- ^ @since 4.8.0.0 + , Eq -- ^ @since 4.8.0.0 + ) + +-- | @since 4.11.0.0 +instance Semigroup EventLifetime where + EL a <> EL b = EL (a .|. b) -- | @since 4.8.0.0 instance Monoid EventLifetime where mempty = EL 0 - EL a `mappend` EL b = EL (a .|. b) eventLifetime :: Event -> Lifetime -> EventLifetime eventLifetime (Event e) l = EL (e .|. lifetimeBit l) @@ -137,7 +153,7 @@ elEvent (EL x) = Event (x .&. 0x7) -- | A type alias for timeouts, specified in nanoseconds. data Timeout = Timeout {-# UNPACK #-} !Word64 | Forever - deriving (Show) + deriving Show -- ^ @since 4.4.0.0 -- | Event notification backend. data Backend = forall a. Backend { @@ -200,7 +216,7 @@ delete :: Backend -> IO () delete (Backend bState _ _ _ bDelete) = bDelete bState {-# INLINE delete #-} --- | Throw an 'IOError' corresponding to the current value of +-- | Throw an 'Prelude.IOError' corresponding to the current value of -- 'getErrno' if the result value of the 'IO' action is -1 and -- 'getErrno' is not 'eINTR'. If the result value is -1 and -- 'getErrno' returns 'eINTR' 0 is returned. Otherwise the result |