lukko: File locking

[ concurrency, library, system ] [ Propose Tags ]

This package provides access to platform dependent file locking APIs:

There are alternative file locking packages:

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.

Versions [faq] 0.1, 0.1.1,,
Change log
Dependencies base (>=4.5 && <4.15) [details]
License GPL-2.0-or-later AND BSD-3-Clause[multiple license files]
Maintainer Oleg Grenrus <>
Category System, Concurrency
Source repo head: git clone
Uploaded by phadej at 2020-03-25T22:23:19Z
Distributions Arch:, Fedora:, NixOS:, openSUSE:
Downloads 6318 total (457 in the last 30 days)
Rating (no votes yet) [estimated by Bayesian average]
Your Rating
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2020-03-25 [all 1 reports]


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Enable open file descriptor locking. Available on Linux (kernel 3.15, released Jun 8, 2014).


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


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