Hi,
I've got data stored in multiple files on a shared file system. I wish to have multiple processes/hosts read and write to these files simultaneously. When a process wish to write to a file no other processes may write to nor read from the file. If no process is writing to the file, any number of processes may read from it. ...and the solution should be very simple and work automagically in the background (no/minimal setup required by the user).
The above can be achieved via file locking mechanism where writers need to require a write lock before writing, and readers need to require a read lock before reading. Any number of read locks can be handed out, but only if no write lock is already in place. Write locks can only be obtained if no other locks (read or write) are handed out. The locking mechanism is per file.
I am locking for a cross platform solution in R that works on any file system, i.e. I am not in control of the operating systems of the hosts nor the file system where the data files are stored. I've been suggested to use, for instance, RSQLite database since it provides atomic transactions (and is available on Windows, *nix & OSX). I can image to have a table where each entry is indexed by a file and it keeps track of how many read and write locks are active.
Does anyone know of existing solution for this, or has ideas how this could be implemented? I appreciate any references/comments.
/Henrik
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