io-classes
Safe HaskellNone
LanguageHaskell2010

Control.Monad.Class.MonadSTM

Description

This module corresponds to Control.Monad.STM in "stm" package

Synopsis

Documentation

class (Monad m, Monad (STM m)) => MonadSTM (m :: Type -> Type) where Source #

The STM primitives parametrised by a monad m.

Associated Types

type STM (m :: Type -> Type) = (stm :: Type -> Type) | stm -> m Source #

The STM monad.

Methods

atomically :: HasCallStack => STM m a -> m a Source #

Atomically run an STM computation.

See atomically.

retry :: STM m a Source #

See retry.

orElse :: STM m a -> STM m a -> STM m a Source #

See orElse.

check :: Bool -> STM m () Source #

See check.

Instances

Instances details
MonadSTM IO Source # 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

Associated Types

type STM IO 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type STM IO = STM
type TVar IO 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TVar IO = TVar
type TMVar IO 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TMVar IO = TMVar
type TQueue IO 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TBQueue IO 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TArray IO 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TSem IO 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TSem IO = TSem
type TChan IO 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TChan IO = TChan

Methods

atomically :: HasCallStack => STM IO a -> IO a Source #

newTVar :: a -> STM IO (TVar IO a) Source #

readTVar :: TVar IO a -> STM IO a Source #

writeTVar :: TVar IO a -> a -> STM IO () Source #

retry :: STM IO a Source #

orElse :: STM IO a -> STM IO a -> STM IO a Source #

modifyTVar :: TVar IO a -> (a -> a) -> STM IO () Source #

modifyTVar' :: TVar IO a -> (a -> a) -> STM IO () Source #

stateTVar :: TVar IO s -> (s -> (a, s)) -> STM IO a Source #

swapTVar :: TVar IO a -> a -> STM IO a Source #

check :: Bool -> STM IO () Source #

newTMVar :: a -> STM IO (TMVar IO a) Source #

newEmptyTMVar :: STM IO (TMVar IO a) Source #

takeTMVar :: TMVar IO a -> STM IO a Source #

tryTakeTMVar :: TMVar IO a -> STM IO (Maybe a) Source #

putTMVar :: TMVar IO a -> a -> STM IO () Source #

tryPutTMVar :: TMVar IO a -> a -> STM IO Bool Source #

readTMVar :: TMVar IO a -> STM IO a Source #

tryReadTMVar :: TMVar IO a -> STM IO (Maybe a) Source #

swapTMVar :: TMVar IO a -> a -> STM IO a Source #

writeTMVar :: TMVar IO a -> a -> STM IO () Source #

isEmptyTMVar :: TMVar IO a -> STM IO Bool Source #

newTQueue :: STM IO (TQueue IO a) Source #

readTQueue :: TQueue IO a -> STM IO a Source #

tryReadTQueue :: TQueue IO a -> STM IO (Maybe a) Source #

peekTQueue :: TQueue IO a -> STM IO a Source #

tryPeekTQueue :: TQueue IO a -> STM IO (Maybe a) Source #

flushTQueue :: TQueue IO a -> STM IO [a] Source #

writeTQueue :: TQueue IO a -> a -> STM IO () Source #

isEmptyTQueue :: TQueue IO a -> STM IO Bool Source #

unGetTQueue :: TQueue IO a -> a -> STM IO () Source #

newTBQueue :: Natural -> STM IO (TBQueue IO a) Source #

readTBQueue :: TBQueue IO a -> STM IO a Source #

tryReadTBQueue :: TBQueue IO a -> STM IO (Maybe a) Source #

peekTBQueue :: TBQueue IO a -> STM IO a Source #

tryPeekTBQueue :: TBQueue IO a -> STM IO (Maybe a) Source #

flushTBQueue :: TBQueue IO a -> STM IO [a] Source #

writeTBQueue :: TBQueue IO a -> a -> STM IO () Source #

lengthTBQueue :: TBQueue IO a -> STM IO Natural Source #

isEmptyTBQueue :: TBQueue IO a -> STM IO Bool Source #

isFullTBQueue :: TBQueue IO a -> STM IO Bool Source #

unGetTBQueue :: TBQueue IO a -> a -> STM IO () Source #

newTSem :: Integer -> STM IO (TSem IO) Source #

waitTSem :: TSem IO -> STM IO () Source #

signalTSem :: TSem IO -> STM IO () Source #

signalTSemN :: Natural -> TSem IO -> STM IO () Source #

newTChan :: STM IO (TChan IO a) Source #

newBroadcastTChan :: STM IO (TChan IO a) Source #

dupTChan :: TChan IO a -> STM IO (TChan IO a) Source #

cloneTChan :: TChan IO a -> STM IO (TChan IO a) Source #

readTChan :: TChan IO a -> STM IO a Source #

tryReadTChan :: TChan IO a -> STM IO (Maybe a) Source #

peekTChan :: TChan IO a -> STM IO a Source #

tryPeekTChan :: TChan IO a -> STM IO (Maybe a) Source #

writeTChan :: TChan IO a -> a -> STM IO () Source #

unGetTChan :: TChan IO a -> a -> STM IO () Source #

isEmptyTChan :: TChan IO a -> STM IO Bool Source #

newTVarIO :: a -> IO (TVar IO a) Source #

readTVarIO :: TVar IO a -> IO a Source #

newTMVarIO :: a -> IO (TMVar IO a) Source #

newEmptyTMVarIO :: IO (TMVar IO a) Source #

newTQueueIO :: IO (TQueue IO a) Source #

newTBQueueIO :: Natural -> IO (TBQueue IO a) Source #

newTChanIO :: IO (TChan IO a) Source #

newBroadcastTChanIO :: IO (TChan IO a) Source #

MonadSTM m => MonadSTM (ReaderT r m) Source #

The underlying stm monad is also transformed.

Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

Associated Types

type STM (ReaderT r m) 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type STM (ReaderT r m) = ReaderT r (STM m)
type TVar (ReaderT r m) 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TVar (ReaderT r m) = TVar m
type TMVar (ReaderT r m) 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TMVar (ReaderT r m) = TMVar m
type TQueue (ReaderT r m) 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TQueue (ReaderT r m) = TQueue m
type TBQueue (ReaderT r m) 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TBQueue (ReaderT r m) = TBQueue m
type TArray (ReaderT r m) 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TArray (ReaderT r m) = TArray m
type TSem (ReaderT r m) 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TSem (ReaderT r m) = TSem m
type TChan (ReaderT r m) 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

type TChan (ReaderT r m) = TChan m

Methods

atomically :: HasCallStack => STM (ReaderT r m) a -> ReaderT r m a Source #

newTVar :: a -> STM (ReaderT r m) (TVar (ReaderT r m) a) Source #

readTVar :: TVar (ReaderT r m) a -> STM (ReaderT r m) a Source #

writeTVar :: TVar (ReaderT r m) a -> a -> STM (ReaderT r m) () Source #

retry :: STM (ReaderT r m) a Source #

orElse :: STM (ReaderT r m) a -> STM (ReaderT r m) a -> STM (ReaderT r m) a Source #

modifyTVar :: TVar (ReaderT r m) a -> (a -> a) -> STM (ReaderT r m) () Source #

modifyTVar' :: TVar (ReaderT r m) a -> (a -> a) -> STM (ReaderT r m) () Source #

stateTVar :: TVar (ReaderT r m) s -> (s -> (a, s)) -> STM (ReaderT r m) a Source #

swapTVar :: TVar (ReaderT r m) a -> a -> STM (ReaderT r m) a Source #

check :: Bool -> STM (ReaderT r m) () Source #

newTMVar :: a -> STM (ReaderT r m) (TMVar (ReaderT r m) a) Source #

newEmptyTMVar :: STM (ReaderT r m) (TMVar (ReaderT r m) a) Source #

takeTMVar :: TMVar (ReaderT r m) a -> STM (ReaderT r m) a Source #

tryTakeTMVar :: TMVar (ReaderT r m) a -> STM (ReaderT r m) (Maybe a) Source #

putTMVar :: TMVar (ReaderT r m) a -> a -> STM (ReaderT r m) () Source #

tryPutTMVar :: TMVar (ReaderT r m) a -> a -> STM (ReaderT r m) Bool Source #

readTMVar :: TMVar (ReaderT r m) a -> STM (ReaderT r m) a Source #

tryReadTMVar :: TMVar (ReaderT r m) a -> STM (ReaderT r m) (Maybe a) Source #

swapTMVar :: TMVar (ReaderT r m) a -> a -> STM (ReaderT r m) a Source #

writeTMVar :: TMVar (ReaderT r m) a -> a -> STM (ReaderT r m) () Source #

isEmptyTMVar :: TMVar (ReaderT r m) a -> STM (ReaderT r m) Bool Source #

newTQueue :: STM (ReaderT r m) (TQueue (ReaderT r m) a) Source #

readTQueue :: TQueue (ReaderT r m) a -> STM (ReaderT r m) a Source #

tryReadTQueue :: TQueue (ReaderT r m) a -> STM (ReaderT r m) (Maybe a) Source #

peekTQueue :: TQueue (ReaderT r m) a -> STM (ReaderT r m) a Source #

tryPeekTQueue :: TQueue (ReaderT r m) a -> STM (ReaderT r m) (Maybe a) Source #

flushTQueue :: TQueue (ReaderT r m) a -> STM (ReaderT r m) [a] Source #

writeTQueue :: TQueue (ReaderT r m) a -> a -> STM (ReaderT r m) () Source #

isEmptyTQueue :: TQueue (ReaderT r m) a -> STM (ReaderT r m) Bool Source #

unGetTQueue :: TQueue (ReaderT r m) a -> a -> STM (ReaderT r m) () Source #

newTBQueue :: Natural -> STM (ReaderT r m) (TBQueue (ReaderT r m) a) Source #

readTBQueue :: TBQueue (ReaderT r m) a -> STM (ReaderT r m) a Source #

tryReadTBQueue :: TBQueue (ReaderT r m) a -> STM (ReaderT r m) (Maybe a) Source #

peekTBQueue :: TBQueue (ReaderT r m) a -> STM (ReaderT r m) a Source #

tryPeekTBQueue :: TBQueue (ReaderT r m) a -> STM (ReaderT r m) (Maybe a) Source #

flushTBQueue :: TBQueue (ReaderT r m) a -> STM (ReaderT r m) [a] Source #

writeTBQueue :: TBQueue (ReaderT r m) a -> a -> STM (ReaderT r m) () Source #

lengthTBQueue :: TBQueue (ReaderT r m) a -> STM (ReaderT r m) Natural Source #

isEmptyTBQueue :: TBQueue (ReaderT r m) a -> STM (ReaderT r m) Bool Source #

isFullTBQueue :: TBQueue (ReaderT r m) a -> STM (ReaderT r m) Bool Source #

unGetTBQueue :: TBQueue (ReaderT r m) a -> a -> STM (ReaderT r m) () Source #

newTSem :: Integer -> STM (ReaderT r m) (TSem (ReaderT r m)) Source #

waitTSem :: TSem (ReaderT r m) -> STM (ReaderT r m) () Source #

signalTSem :: TSem (ReaderT r m) -> STM (ReaderT r m) () Source #

signalTSemN :: Natural -> TSem (ReaderT r m) -> STM (ReaderT r m) () Source #

newTChan :: STM (ReaderT r m) (TChan (ReaderT r m) a) Source #

newBroadcastTChan :: STM (ReaderT r m) (TChan (ReaderT r m) a) Source #

dupTChan :: TChan (ReaderT r m) a -> STM (ReaderT r m) (TChan (ReaderT r m) a) Source #

cloneTChan :: TChan (ReaderT r m) a -> STM (ReaderT r m) (TChan (ReaderT r m) a) Source #

readTChan :: TChan (ReaderT r m) a -> STM (ReaderT r m) a Source #

tryReadTChan :: TChan (ReaderT r m) a -> STM (ReaderT r m) (Maybe a) Source #

peekTChan :: TChan (ReaderT r m) a -> STM (ReaderT r m) a Source #

tryPeekTChan :: TChan (ReaderT r m) a -> STM (ReaderT r m) (Maybe a) Source #

writeTChan :: TChan (ReaderT r m) a -> a -> STM (ReaderT r m) () Source #

unGetTChan :: TChan (ReaderT r m) a -> a -> STM (ReaderT r m) () Source #

isEmptyTChan :: TChan (ReaderT r m) a -> STM (ReaderT r m) Bool Source #

newTVarIO :: a -> ReaderT r m (TVar (ReaderT r m) a) Source #

readTVarIO :: TVar (ReaderT r m) a -> ReaderT r m a Source #

newTMVarIO :: a -> ReaderT r m (TMVar (ReaderT r m) a) Source #

newEmptyTMVarIO :: ReaderT r m (TMVar (ReaderT r m) a) Source #

newTQueueIO :: ReaderT r m (TQueue (ReaderT r m) a) Source #

newTBQueueIO :: Natural -> ReaderT r m (TBQueue (ReaderT r m) a) Source #

newTChanIO :: ReaderT r m (TChan (ReaderT r m) a) Source #

newBroadcastTChanIO :: ReaderT r m (TChan (ReaderT r m) a) Source #

throwSTM :: forall (m :: Type -> Type) e a. (MonadSTM m, MonadThrow (STM m), Exception e) => e -> STM m a Source #

throwIO specialised to stm monad.

non standard extensions

The non standard extensions include MonadLabelledSTM and MonadTraceSTM / MonadInspectSTM. For IO these are all no-op, however they greatly enhance IOSim capabilities. They are not only useful for debugging concurrency issues, but also to write testable properties.

class MonadSTM m => MonadLabelledSTM (m :: Type -> Type) Source #

Labelled TVars & friends.

The IO instances is no-op, the IOSim instance enhances simulation trace. This is very useful when analysing low lever concurrency issues (e.g. deadlocks, livelocks etc).

Minimal complete definition

labelTVar

Instances

Instances details
MonadLabelledSTM IO Source #

noop instance

Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

class MonadInspectSTM m => MonadTraceSTM (m :: Type -> Type) where Source #

MonadTraceSTM allows to trace values of stm variables when stm transaction is committed. This allows to verify invariants when a variable is committed.

Minimal complete definition

traceTVar, traceTQueue, traceTBQueue

Methods

traceTVar Source #

Arguments

:: proxy m 
-> TVar m a 
-> (Maybe a -> a -> InspectMonad m TraceValue)

callback which receives initial value or Nothing (if it is a newly created TVar), and the committed value.

-> STM m () 

Construct a trace output out of previous & new value of a TVar. The callback is called whenever an stm transaction which modifies the TVar is committed.

This is supported by IOSim (and IOSimPOR); IO has a trivial instance.

The simplest example is:

traceTVar (Proxy @m) tvar (\_ -> TraceString . show)

Note that the interpretation of TraceValue depends on the monad m itself (see TraceValue).

traceTMVar :: proxy m -> TMVar m a -> (Maybe (Maybe a) -> Maybe a -> InspectMonad m TraceValue) -> STM m () Source #

default traceTMVar :: TMVar m a ~ TMVarDefault m a => proxy m -> TMVar m a -> (Maybe (Maybe a) -> Maybe a -> InspectMonad m TraceValue) -> STM m () Source #

traceTQueue :: proxy m -> TQueue m a -> (Maybe [a] -> [a] -> InspectMonad m TraceValue) -> STM m () Source #

traceTBQueue :: proxy m -> TBQueue m a -> (Maybe [a] -> [a] -> InspectMonad m TraceValue) -> STM m () Source #

traceTSem :: proxy m -> TSem m -> (Maybe Integer -> Integer -> InspectMonad m TraceValue) -> STM m () Source #

default traceTSem :: TSem m ~ TSemDefault m => proxy m -> TSem m -> (Maybe Integer -> Integer -> InspectMonad m TraceValue) -> STM m () Source #

traceTVarIO :: TVar m a -> (Maybe a -> a -> InspectMonad m TraceValue) -> m () Source #

default traceTVarIO :: TVar m a -> (Maybe a -> a -> InspectMonad m TraceValue) -> m () Source #

traceTMVarIO :: TMVar m a -> (Maybe (Maybe a) -> Maybe a -> InspectMonad m TraceValue) -> m () Source #

default traceTMVarIO :: TMVar m a -> (Maybe (Maybe a) -> Maybe a -> InspectMonad m TraceValue) -> m () Source #

traceTQueueIO :: TQueue m a -> (Maybe [a] -> [a] -> InspectMonad m TraceValue) -> m () Source #

default traceTQueueIO :: TQueue m a -> (Maybe [a] -> [a] -> InspectMonad m TraceValue) -> m () Source #

traceTBQueueIO :: TBQueue m a -> (Maybe [a] -> [a] -> InspectMonad m TraceValue) -> m () Source #

default traceTBQueueIO :: TBQueue m a -> (Maybe [a] -> [a] -> InspectMonad m TraceValue) -> m () Source #

traceTSemIO :: TSem m -> (Maybe Integer -> Integer -> InspectMonad m TraceValue) -> m () Source #

default traceTSemIO :: TSem m -> (Maybe Integer -> Integer -> InspectMonad m TraceValue) -> m () Source #

Instances

Instances details
MonadTraceSTM IO Source #

noop instance

Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

Methods

traceTVar :: proxy IO -> TVar IO a -> (Maybe a -> a -> InspectMonad IO TraceValue) -> STM IO () Source #

traceTMVar :: proxy IO -> TMVar IO a -> (Maybe (Maybe a) -> Maybe a -> InspectMonad IO TraceValue) -> STM IO () Source #

traceTQueue :: proxy IO -> TQueue IO a -> (Maybe [a] -> [a] -> InspectMonad IO TraceValue) -> STM IO () Source #

traceTBQueue :: proxy IO -> TBQueue IO a -> (Maybe [a] -> [a] -> InspectMonad IO TraceValue) -> STM IO () Source #

traceTSem :: proxy IO -> TSem IO -> (Maybe Integer -> Integer -> InspectMonad IO TraceValue) -> STM IO () Source #

traceTVarIO :: TVar IO a -> (Maybe a -> a -> InspectMonad IO TraceValue) -> IO () Source #

traceTMVarIO :: TMVar IO a -> (Maybe (Maybe a) -> Maybe a -> InspectMonad IO TraceValue) -> IO () Source #

traceTQueueIO :: TQueue IO a -> (Maybe [a] -> [a] -> InspectMonad IO TraceValue) -> IO () Source #

traceTBQueueIO :: TBQueue IO a -> (Maybe [a] -> [a] -> InspectMonad IO TraceValue) -> IO () Source #

traceTSemIO :: TSem IO -> (Maybe Integer -> Integer -> InspectMonad IO TraceValue) -> IO () Source #

MonadTraceSTM m => MonadTraceSTM (ReaderT r m) Source # 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

Methods

traceTVar :: proxy (ReaderT r m) -> TVar (ReaderT r m) a -> (Maybe a -> a -> InspectMonad (ReaderT r m) TraceValue) -> STM (ReaderT r m) () Source #

traceTMVar :: proxy (ReaderT r m) -> TMVar (ReaderT r m) a -> (Maybe (Maybe a) -> Maybe a -> InspectMonad (ReaderT r m) TraceValue) -> STM (ReaderT r m) () Source #

traceTQueue :: proxy (ReaderT r m) -> TQueue (ReaderT r m) a -> (Maybe [a] -> [a] -> InspectMonad (ReaderT r m) TraceValue) -> STM (ReaderT r m) () Source #

traceTBQueue :: proxy (ReaderT r m) -> TBQueue (ReaderT r m) a -> (Maybe [a] -> [a] -> InspectMonad (ReaderT r m) TraceValue) -> STM (ReaderT r m) () Source #

traceTSem :: proxy (ReaderT r m) -> TSem (ReaderT r m) -> (Maybe Integer -> Integer -> InspectMonad (ReaderT r m) TraceValue) -> STM (ReaderT r m) () Source #

traceTVarIO :: TVar (ReaderT r m) a -> (Maybe a -> a -> InspectMonad (ReaderT r m) TraceValue) -> ReaderT r m () Source #

traceTMVarIO :: TMVar (ReaderT r m) a -> (Maybe (Maybe a) -> Maybe a -> InspectMonad (ReaderT r m) TraceValue) -> ReaderT r m () Source #

traceTQueueIO :: TQueue (ReaderT r m) a -> (Maybe [a] -> [a] -> InspectMonad (ReaderT r m) TraceValue) -> ReaderT r m () Source #

traceTBQueueIO :: TBQueue (ReaderT r m) a -> (Maybe [a] -> [a] -> InspectMonad (ReaderT r m) TraceValue) -> ReaderT r m () Source #

traceTSemIO :: TSem (ReaderT r m) -> (Maybe Integer -> Integer -> InspectMonad (ReaderT r m) TraceValue) -> ReaderT r m () Source #

data TraceValue where Source #

A GADT which instructs how to trace the value. The traceDynamic will use dynamic tracing, e.g. "Control.Monad.IOSim.traceM"; while traceString will be traced with EventSay. The IOSims dynamic tracing allows to recover the value from the simulation trace (see "Control.Monad.IOSim.selectTraceEventsDynamic").

Constructors

TraceValue 

Fields

Bundled Patterns

pattern TraceDynamic :: () => Typeable tr => tr -> TraceValue

Use only a dynamic tracer.

pattern TraceString :: String -> TraceValue

Use only string tracing.

pattern DontTrace :: TraceValue

Do not trace the value.

class (MonadSTM m, Monad (InspectMonad m)) => MonadInspectSTM (m :: Type -> Type) where Source #

This type class is indented for 'io-sim', where one might want to access a TVar in the underlying ST monad.

Associated Types

type InspectMonad (m :: Type -> Type) :: Type -> Type Source #

Methods

inspectTVar :: proxy m -> TVar m a -> InspectMonad m a Source #

Return the value of a TVar as an InspectMonad computation.

inspectTVar is useful if the value of a TVar observed by traceTVar contains other TVars.

inspectTMVar :: proxy m -> TMVar m a -> InspectMonad m (Maybe a) Source #

Return the value of a TMVar as an InspectMonad computation.

Instances

Instances details
MonadInspectSTM IO Source # 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

Associated Types

type InspectMonad IO 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

Methods

inspectTVar :: proxy IO -> TVar IO a -> InspectMonad IO a Source #

inspectTMVar :: proxy IO -> TMVar IO a -> InspectMonad IO (Maybe a) Source #

MonadInspectSTM m => MonadInspectSTM (ReaderT r m) Source # 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

Associated Types

type InspectMonad (ReaderT r m) 
Instance details

Defined in Control.Monad.Class.MonadSTM.Internal

Methods

inspectTVar :: proxy (ReaderT r m) -> TVar (ReaderT r m) a -> InspectMonad (ReaderT r m) a Source #

inspectTMVar :: proxy (ReaderT r m) -> TMVar (ReaderT r m) a -> InspectMonad (ReaderT r m) (Maybe a) Source #