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NSDistributedLock can be used to to restrict access to a shared resource, such as a file.

Why does NSDistributedLock use a directory instead of a file? (I know this implementation detail isn’t documented, but in practice both Foundation and GNUStep use a directory.) —-

My guess would be that it’s more efficient to create a directory node in the file system than a file, since a directory requires no actual space allocating to it. But I’m only guessing. –GC