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Platform-independent file locking module

The lockfile module exports a FileLock class which provides a simple API for locking files.
Unlike the Windows msvcrt.locking function, the Unix fcntl.flock, fcntl.lockf and the
deprecated posixfile module, the API is identical across both Unix (including Linux and
Mac) and Windows platforms. The lock mechanism relies on the atomic nature of the link
(on Unix) and mkdir (on Windows) system calls.

Author:
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    Skip Montanaro <skip@pobox.com>

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