Take a look at POE. It's basically user-space threading, with an application kernel that allows you to do exactly what you're talking about, without the messiness of forking and shared memory...

A bit of a steep learning curve, but one you won't look back from!

In reply to Re: using hashes (or hash values) across FORKED processes by ozone
in thread using hashes (or hash values) across FORKED processes by Anonymous Monk

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