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copied!<p>This is something i've wanted to write for some time, but there's always some more pressing thing to do...</p> <p>still, for most of the usecases of a shared key-data RAM store, <a href="http://www.danga.com/memcached/" rel="nofollow noreferrer">memcached</a> would be the simplest answer.</p> <p>In your case, it looks like it's lower-level, so it memcached, fast as it is, might not be the best answer. I'd try <a href="http://judy.sourceforge.net/" rel="nofollow noreferrer">Judy Arrays</a> on a <code>shmem</code> block. They're really fast, so even if you wrap the access with a simplistic lock, you'd still get high performance access.</p> <p>For more complex tasks, I'd search about lock-free structures (some links: <a href="http://www.erdani.org/publications/cuj-2004-10.pdf" rel="nofollow noreferrer">1</a>, <a href="http://research.microsoft.com/en-us/um/people/simonpj/Papers/stm/lock-free-flops06.pdf" rel="nofollow noreferrer">2</a>, <a href="http://www.audiomulch.com/~rossb/code/lockfree/liblfds/index.htm" rel="nofollow noreferrer">3</a>,<a href="http://udrepper.livejournal.com/14249.html" rel="nofollow noreferrer">4</a>). I even wrote <a href="http://javier.guerrag.com/2008/06/compiles-ship-it.html" rel="nofollow noreferrer">one</a> some time ago, with <a href="http://javier.guerrag.com/2008/05/lock-free-concurrent-lua.html" rel="nofollow noreferrer">hopes</a> of integrating it in a <a href="http://www.lua.org/" rel="nofollow noreferrer">Lua</a> kernel, but it proved really hard to keep with the existing implementation. Still, it might interest you.</p>

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