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Filesystem-based interprocess mutex.
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Write a file at C{filename} with the contents of C{value}. See the
above comment block as to why this is needed.
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Read the contents of C{filename}. See the above comment block as to why
this is needed.
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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 OSError: Any exception L{os.symlink()} may raise,
other than L{errno.EEXIST}.
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Release this lock.
This deletes the directory with the given name.
@raise OSError: Any exception L{os.readlink()} may raise.
@raise ValueError: If the lock is not owned by this process.
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Determine if the lock of the given name is held or not.
@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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