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Message: [QUOTE="Axel Boldt, post: 4758857"] Hello, I want to share a hash variable among several forked processes. Ideally I would use threads and threads::shared, but I need LWP which is not thread-safe. So I thought about using DB_FILE and a hash variable tied to the same file in each of the processes. If one process changes the hash variable, all others should see the change immediately. I.e. I want that the change is immediately flushed to disk, and that every access to the hash variable takes its value directly from disk, not from some internal cache. Is that possible? I have tried the O_SYNC flag for db_open and also the $db->sync() method to no avail. If it's not possible, what do people usually do to keep a set of cooperating processes informed about the results that the other processes have already computed? Thanks, Axel [/QUOTE]