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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<maintainer type="project">
<email>haskell@gentoo.org</email>
<name>Gentoo Haskell</name>
</maintainer>
<use>
<flag name="ofd-locking">Enable open file descriptor locking. Available on Linux (kernel 3.15, released Jun 8, 2014).</flag>
</use>
<longdescription>
This package provides access to platform dependent file locking APIs:
* Open file descriptor locking on Linux ("Lukko.OFD")
* @flock@ locking on unix platforms ("Lukko.FLock")
* Windows locking @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 'Handle's so these locks cannot be used for intra-process locking.
(You should use e.g. 'MVar' in addition).
* <https://hackage.haskell.org/package/filelock 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.
</longdescription>
</pkgmetadata>
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