GHC.IO.SubSystem

The IoSubSystem control interface. These methods can be used to disambiguate between the two operations.

The API of this module is unstable and not meant to be consumed by the general public. If you absolutely must depend on it, make sure to use a tight upper bound, e.g., base < 4.X rather than base < 5, because the interface can change rapidly without much warning.

Documentation

withIoSubSystem :: (IoSubSystem -> IO a) -> IO a

withIoSubSystem' :: (IoSubSystem -> a) -> a

whenIoSubSystem :: IoSubSystem -> IO () -> IO ()

ioSubSystem :: IoSubSystem

data IoSubSystem

The I/O SubSystem to use in the program.

Since: base-4.9.0.0

Constructors

IoPOSIX

Use a POSIX I/O Sub-System

IoNative

Use platform native Sub-System. For unix OSes this is the same as IoPOSIX, but on Windows this means use the Windows native APIs for I/O, including IOCP and RIO.

Instances

Enum IoSubSystem

Since: base-4.9.0.0

Defined in GHC.Internal.RTS.Flags

Methods

succ :: IoSubSystem -> IoSubSystem

pred :: IoSubSystem -> IoSubSystem

toEnum :: Int -> IoSubSystem

fromEnum :: IoSubSystem -> Int

enumFrom :: IoSubSystem -> [IoSubSystem]

enumFromThen :: IoSubSystem -> IoSubSystem -> [IoSubSystem]

enumFromTo :: IoSubSystem -> IoSubSystem -> [IoSubSystem]

enumFromThenTo :: IoSubSystem -> IoSubSystem -> IoSubSystem -> [IoSubSystem]

Storable IoSubSystem

Since: base-4.9.0.0

Defined in GHC.Internal.RTS.Flags

Methods

sizeOf :: IoSubSystem -> Int

alignment :: IoSubSystem -> Int

peekElemOff :: Ptr IoSubSystem -> Int -> IO IoSubSystem

pokeElemOff :: Ptr IoSubSystem -> Int -> IoSubSystem -> IO ()

peekByteOff :: Ptr b -> Int -> IO IoSubSystem

pokeByteOff :: Ptr b -> Int -> IoSubSystem -> IO ()

peek :: Ptr IoSubSystem -> IO IoSubSystem

poke :: Ptr IoSubSystem -> IoSubSystem -> IO ()

Show IoSubSystem

Defined in GHC.Internal.RTS.Flags

Methods

showsPrec :: Int -> IoSubSystem -> ShowS

show :: IoSubSystem -> String

showList :: [IoSubSystem] -> ShowS

Eq IoSubSystem

Defined in GHC.Internal.RTS.Flags

Methods

(==) :: IoSubSystem -> IoSubSystem -> Bool

(/=) :: IoSubSystem -> IoSubSystem -> Bool

conditional :: a -> a -> a

Conditionally execute an action depending on the configured I/O subsystem. On POSIX systems always execute the first action. On Windows execute the second action if WINIO as active, otherwise fall back to the first action.

(<!>) :: a -> a -> a infixl 7

Infix version of conditional. posix ! windows == conditional posix windows

isWindowsNativeIO :: Bool