lukko-0.1.1.3: File locking

# lukko-0.1.1.3: 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 `Handle`s 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

lukko-0.1.1.3

- Lukko
  Submodules
  - Lukko.FLock
  - Lukko.NoOp
  - Lukko.OFD