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copied!<p><a href="http://lua.org" rel="nofollow noreferrer">Lua</a> is a scripting language that integrates very nicely with C within the same process. It uses a stack model to bridge the impedance mismatch between the two languages / run-times. The Lua implementation is open-source and relatively compact; so it may be good candidate for studying.</p> <p><a href="http://www.freedesktop.org/wiki/Software/dbus" rel="nofollow noreferrer">D-Bus</a> is an example of using IPC. It can be used to integrate separate processes implemented in different languages. It supports asynchronous messaging as well as synchronous method invocation. There are D-Bus implementations for Gtk, Qt, python etc...</p> <p>The <a href="http://en.wikipedia.org/wiki/Parrot_virtual_machine" rel="nofollow noreferrer">Parrot Virtual Machine</a> is a VM that is aiming for language inter-operation.</p> <p>Yet another approach is the one taken by GLib (used by Gtk). From the <a href="http://library.gnome.org/devel/gobject/unstable/ch01s02.html" rel="nofollow noreferrer">GObject manual</a>:</p> <blockquote> <p>The solution used by GLib is to use the GType library which holds at runtime a description of all the objects manipulated by the programmer. This so-called dynamic type <a href="http://lua.org" rel="nofollow noreferrer">1</a> library is then used by special generic glue code to automatically convert function parameters and function calling conventions between different runtime domains.</p> </blockquote>

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