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Write a file at C{filename} with the contents of C{value}. See the
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Read the contents of C{filename}. See the above comment block as to why
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�FilesystemLocka
A mutex.
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@ivar name: The name of the file associated with this lock.
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Acquire this lock.
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Release this lock.
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Determine if the lock of the given name is held or not.
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