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Filesystem-based interprocess mutex.
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A mutex.
This relies on the filesystem property that creating
a symlink is an atomic operation and that it will
fail if the symlink already exists. Deleting the
symlink will release the lock.
@ivar name: The name of the file associated with this lock.
@ivar clean: Indicates whether this lock was released cleanly by its
last owner. Only meaningful after C{lock} has been called and
returns True.
@ivar locked: Indicates whether the lock is currently held by this
object.
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Acquire this lock.
@rtype: C{bool}
@return: True if the lock is acquired, false otherwise.
@raise: Any exception os.symlink() may raise, other than
EEXIST.
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Release this lock.
This deletes the directory with the given name.
@raise: Any exception os.readlink() may raise, or
ValueError if the lock is not owned by this process.
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@type name: C{str}
@param name: The filesystem path to the lock to test
@rtype: C{bool}
@return: True if the lock is held, False otherwise.
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