resourcet-1.2.4.3: Deterministic allocation and freeing of scarce resources.
Safe HaskellNone
LanguageHaskell2010

Control.Monad.Trans.Resource.Internal

Synopsis

Documentation

data InvalidAccess #

Indicates either an error in the library, or misuse of it (e.g., a ResourceT's state is accessed after being released).

Since 0.3.0

Constructors

InvalidAccess 

Fields

class MonadIO m => MonadResource m where #

A Monad which allows for safe resource allocation. In theory, any monad transformer stack which includes a ResourceT can be an instance of MonadResource.

Note: runResourceT has a requirement for a MonadUnliftIO m monad, which allows control operations to be lifted. A MonadResource does not have this requirement. This means that transformers such as ContT can be an instance of MonadResource. However, the ContT wrapper will need to be unwrapped before calling runResourceT.

Since 0.3.0

Methods

liftResourceT :: ResourceT IO a -> m a #

Lift a ResourceT IO action into the current Monad.

Since 0.4.0

Instances

Instances details
MonadResource m => MonadResource (MaybeT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> MaybeT m a #

MonadResource m => MonadResource (ListT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> ListT m a #

MonadIO m => MonadResource (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> ResourceT m a #

MonadResource m => MonadResource (ExceptT e m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> ExceptT e m a #

MonadResource m => MonadResource (IdentityT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> IdentityT m a #

MonadResource m => MonadResource (ReaderT r m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> ReaderT r m a #

MonadResource m => MonadResource (StateT s m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> StateT s m a #

MonadResource m => MonadResource (StateT s m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> StateT s m a #

(Monoid w, MonadResource m) => MonadResource (WriterT w m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> WriterT w m a #

(Monoid w, MonadResource m) => MonadResource (WriterT w m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> WriterT w m a #

MonadResource m => MonadResource (ContT r m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> ContT r m a #

(Monoid w, MonadResource m) => MonadResource (RWST r w s m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> RWST r w s m a #

(Monoid w, MonadResource m) => MonadResource (RWST r w s m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> RWST r w s m a #

data ReleaseKey #

A lookup key for a specific release action. This value is returned by register and allocate, and is passed to release.

Since 0.3.0

Constructors

ReleaseKey !(IORef ReleaseMap) !Int 

data ReleaseMap #

Constructors

ReleaseMap !NextKey !RefCount !(IntMap (ReleaseType -> IO ())) 
ReleaseMapClosed 

type ResIO = ResourceT IO #

Convenient alias for ResourceT IO.

newtype ResourceT m a #

The Resource transformer. This transformer keeps track of all registered actions, and calls them upon exit (via runResourceT). Actions may be registered via register, or resources may be allocated atomically via allocate. allocate corresponds closely to bracket.

Releasing may be performed before exit via the release function. This is a highly recommended optimization, as it will ensure that scarce resources are freed early. Note that calling release will deregister the action, so that a release action will only ever be called once.

Since 0.3.0

Constructors

ResourceT 

Fields

Instances

Instances details
MonadTrans ResourceT # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

lift :: Monad m => m a -> ResourceT m a #

MonadRWS r w s m => MonadRWS r w s (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

MonadWriter w m => MonadWriter w (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

writer :: (a, w) -> ResourceT m a #

tell :: w -> ResourceT m () #

listen :: ResourceT m a -> ResourceT m (a, w) #

pass :: ResourceT m (a, w -> w) -> ResourceT m a #

MonadState s m => MonadState s (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

get :: ResourceT m s #

put :: s -> ResourceT m () #

state :: (s -> (a, s)) -> ResourceT m a #

MonadReader r m => MonadReader r (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

ask :: ResourceT m r #

local :: (r -> r) -> ResourceT m a -> ResourceT m a #

reader :: (r -> a) -> ResourceT m a #

MonadError e m => MonadError e (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

throwError :: e -> ResourceT m a #

catchError :: ResourceT m a -> (e -> ResourceT m a) -> ResourceT m a #

Monad m => Monad (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

(>>=) :: ResourceT m a -> (a -> ResourceT m b) -> ResourceT m b #

(>>) :: ResourceT m a -> ResourceT m b -> ResourceT m b #

return :: a -> ResourceT m a #

Functor m => Functor (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

fmap :: (a -> b) -> ResourceT m a -> ResourceT m b #

(<$) :: a -> ResourceT m b -> ResourceT m a #

MonadFix m => MonadFix (ResourceT m) #

Since: 1.1.8

Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

mfix :: (a -> ResourceT m a) -> ResourceT m a #

MonadFail m => MonadFail (ResourceT m) #

Since: 1.2.2

Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

fail :: String -> ResourceT m a #

Applicative m => Applicative (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

pure :: a -> ResourceT m a #

(<*>) :: ResourceT m (a -> b) -> ResourceT m a -> ResourceT m b #

liftA2 :: (a -> b -> c) -> ResourceT m a -> ResourceT m b -> ResourceT m c #

(*>) :: ResourceT m a -> ResourceT m b -> ResourceT m b #

(<*) :: ResourceT m a -> ResourceT m b -> ResourceT m a #

MonadIO m => MonadIO (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftIO :: IO a -> ResourceT m a #

Alternative m => Alternative (ResourceT m) #

Since 1.1.5

Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

empty :: ResourceT m a #

(<|>) :: ResourceT m a -> ResourceT m a -> ResourceT m a #

some :: ResourceT m a -> ResourceT m [a] #

many :: ResourceT m a -> ResourceT m [a] #

MonadPlus m => MonadPlus (ResourceT m) #

Since 1.1.5

Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

mzero :: ResourceT m a #

mplus :: ResourceT m a -> ResourceT m a -> ResourceT m a #

MonadThrow m => MonadThrow (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

throwM :: Exception e => e -> ResourceT m a #

MonadCatch m => MonadCatch (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

catch :: Exception e => ResourceT m a -> (e -> ResourceT m a) -> ResourceT m a #

MonadMask m => MonadMask (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

mask :: ((forall a. ResourceT m a -> ResourceT m a) -> ResourceT m b) -> ResourceT m b #

uninterruptibleMask :: ((forall a. ResourceT m a -> ResourceT m a) -> ResourceT m b) -> ResourceT m b #

generalBracket :: ResourceT m a -> (a -> ExitCase b -> ResourceT m c) -> (a -> ResourceT m b) -> ResourceT m (b, c) #

MonadCont m => MonadCont (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

callCC :: ((a -> ResourceT m b) -> ResourceT m a) -> ResourceT m a #

PrimMonad m => PrimMonad (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Associated Types

type PrimState (ResourceT m) #

Methods

primitive :: (State# (PrimState (ResourceT m)) -> (# State# (PrimState (ResourceT m)), a #)) -> ResourceT m a #

MonadUnliftIO m => MonadUnliftIO (ResourceT m) #

Since: 1.1.10

Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

withRunInIO :: ((forall a. ResourceT m a -> IO a) -> IO b) -> ResourceT m b #

MonadIO m => MonadResource (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

Methods

liftResourceT :: ResourceT IO a -> ResourceT m a #

type PrimState (ResourceT m) # 
Instance details

Defined in Control.Monad.Trans.Resource.Internal

transResourceT :: (m a -> n b) -> ResourceT m a -> ResourceT n b #

Transform the monad a ResourceT lives in. This is most often used to strip or add new transformers to a stack, e.g. to run a ReaderT.

Note that this function is a slight generalization of hoist.

Since 0.3.0

data ResourceCleanupException #

Thrown when one or more cleanup functions themselves throw an exception during cleanup.

Since: 1.1.11

Constructors

ResourceCleanupException 

Fields

stateCleanupChecked #

Arguments

:: Maybe SomeException

exception that killed the ResourceT, if present

-> IORef ReleaseMap 
-> IO () 

Clean up a release map, but throw a ResourceCleanupException if anything goes wrong in the cleanup handlers.

Since: 1.1.11