What is the significance of the lock files when different workers are started with different local directories?

I'm creating different runtime directories for each worker. And I noticed that each worker creates a `global.lock` and `purge.lock` files.

Are these files meant to be coordinated between all invocations of `dask-worker` workers?

Or are they only used for a single `dask-worker` where it has multiple processes/threads using the same directory.

Can there be a problem with multiple invocations of `dask-worker` are using different local directories or the same local directory?