I am looking for a way to have one R session lock a file for
read/write access, while being updated/modified by another R session.
This will provide me with a-poor-mans parallelization method. It is
ok to have so called advisory looking (as in Unix), which are
non-mandatory to follow. If not available, I'll use lock files, but
there are some potential problems in creating such in an atomic way.
Ideally I wish to have this working on all platforms.
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