Lukko.FLock

File locking via BSD-style flock(2).

Types

data FileLockingNotSupported

Exception thrown by hLock on non-Windows platforms that don't support flock.

Constructors

FileLockingNotSupported

Instances

Show FileLockingNotSupported

Defined in Lukko.Internal.Types

Methods

showsPrec :: Int -> FileLockingNotSupported -> ShowS

show :: FileLockingNotSupported -> String

showList :: [FileLockingNotSupported] -> ShowS

Exception FileLockingNotSupported

Defined in Lukko.Internal.Types

Methods

toException :: FileLockingNotSupported -> SomeException

fromException :: SomeException -> Maybe FileLockingNotSupported

displayException :: FileLockingNotSupported -> String

fileLockingSupported :: Bool

A constants specifying whether file locking is supported.

type FileLockingSupported = True

A type level fileLockingSupported.

data FileLockingMethod

Potentially availble lock methods.

Constructors

MethodOFD

open file descriptor locking

MethodFLock

BSD flock

MethodWindows

Windows locking

MethodNoOp

No-Op (throws FileLockingNotSupported)

Instances

Bounded FileLockingMethod

Defined in Lukko.Internal.Types

Methods

minBound :: FileLockingMethod

maxBound :: FileLockingMethod

Enum FileLockingMethod

Defined in Lukko.Internal.Types

Methods

succ :: FileLockingMethod -> FileLockingMethod

pred :: FileLockingMethod -> FileLockingMethod

toEnum :: Int -> FileLockingMethod

fromEnum :: FileLockingMethod -> Int

enumFrom :: FileLockingMethod -> [FileLockingMethod]

enumFromThen :: FileLockingMethod -> FileLockingMethod -> [FileLockingMethod]

enumFromTo :: FileLockingMethod -> FileLockingMethod -> [FileLockingMethod]

enumFromThenTo :: FileLockingMethod -> FileLockingMethod -> FileLockingMethod -> [FileLockingMethod]

Eq FileLockingMethod

Defined in Lukko.Internal.Types

Methods

(==) :: FileLockingMethod -> FileLockingMethod -> Bool

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

Ord FileLockingMethod

Defined in Lukko.Internal.Types

Methods

compare :: FileLockingMethod -> FileLockingMethod -> Ordering

(<) :: FileLockingMethod -> FileLockingMethod -> Bool

(<=) :: FileLockingMethod -> FileLockingMethod -> Bool

(>) :: FileLockingMethod -> FileLockingMethod -> Bool

(>=) :: FileLockingMethod -> FileLockingMethod -> Bool

max :: FileLockingMethod -> FileLockingMethod -> FileLockingMethod

min :: FileLockingMethod -> FileLockingMethod -> FileLockingMethod

Show FileLockingMethod

Defined in Lukko.Internal.Types

Methods

showsPrec :: Int -> FileLockingMethod -> ShowS

show :: FileLockingMethod -> String

showList :: [FileLockingMethod] -> ShowS

fileLockingMethod :: FileLockingMethod

A constant specifying this method

data LockMode

Indicates a mode in which a file should be locked.

Constructors

SharedLock

ExclusiveLock

File descriptors

data FD

Opaque file descriptor

This is a wrapper over CInt

fdOpen :: FilePath -> IO FD

Open file to be used for locking.

open(path, O_RDWR | O_CREAT);

fdClose :: FD -> IO ()

Close lock file.

close(fd);

fdLock :: FD -> LockMode -> IO ()

Lock using BSD-style locks.

fdTryLock :: FD -> LockMode -> IO Bool

Try to lock using BSD-style locks.

fdUnlock :: FD -> IO ()

Unlock using BSD-style locks.

Handles

hLock :: Handle -> LockMode -> IO ()

Lock using BSD-style locks.

hTryLock :: Handle -> LockMode -> IO Bool

Try to lock using BSD-style locks.

hUnlock :: Handle -> IO ()

Unlock using BSD-style locks.