lukko: File locking

This package provides access to platform dependent file locking APIs:

• Open file descriptor locking on Linux (Lukko.OFD)

• BSD-style flock(2) locks on UNIX platforms (Lukko.FLock)

• Windows locking via LockFileEx (Lukko.Windows)

• No-op locking, which throws exceptions (Lukko.NoOp)

• Lukko module exports the best option for the target platform with uniform API.

There are alternative file locking packages:

• GHC.IO.Handle.Lock in base >= 4.10 is good enough for most use cases. However, uses only Handles so these locks cannot be used for intra-process locking. (You should use e.g. MVar in addition).

• filelock doesn't support OFD locking.

Lukko means lock in Finnish.

Submodules Lukko.OFD, Lukko.Windows etc are available based on following conditions.

if os(windows)
  cpp-options: -DHAS_WINDOWS_LOCK

elif (os(linux) && flag(ofd-locking))
  cpp-options: -DHAS_OFD_LOCKING
  cpp-options: -DHAS_FLOCK

elif !(os(solaris) || os(aix))
  cpp-options: -DHAS_FLOCK

Lukko.FLock is available on not (Windows or Solaris or AIX). Lukko.NoOp is always available.

Modules

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Flags

Manual Flags

Name	Description	Default
ofd-locking	Enable open file descriptor locking. Available on Linux (kernel 3.15, released Jun 8, 2014).	Enabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

Downloads

• lukko-0.1.2.tar.gz [browse] (Cabal source package)
• Package description (as included in the package)

Maintainer's Corner

Package maintainers

• phadej

For package maintainers and hackage trustees

• edit package information

Candidates

• 0.1, 0.1.1, 0.1.1.1, 0.1.1.2, 0.1.1.3