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    <p>As already noted, there are several issues with the script that prevent you from getting what you want:</p> <ul> <li><code>os.execute("...")</code> is blocked until the command is completed and in your case it doesn't complete (as it runs an infinite loop). <strong>Solution:</strong> you need to detach that process from yours by using something like <code>io.popen()</code> instead of <code>os.execute()</code></li> <li><code>co = coroutine.create( startServer() )</code> doesn't create a coroutine in your case. <code>coroutine.create</code> call accepts a function reference and you pass it the result of <code>startServer</code> call, which is <code>nil</code>. <strong>Solution:</strong> use <code>co = coroutine.create( startServer )</code> (note that parenthesis are dropped, so it's not a function call anymore).</li> <li>You are not yielding from your coroutines; if you want several coroutines to work together, they need to be cooperating by giving control to each other when appropriate. That's what <code>yield</code> command is for and that's why it's called <a href="http://www.lua.org/pil/9.4.html" rel="nofollow">non-preemptive multithreading</a>. <strong>Solution:</strong> you need to use a combination of <code>resume</code> and <code>yield</code> calls after you <code>create</code> your coroutine.</li> <li><code>startServer</code> doesn't need to be a coroutine as you are not giving control back to it; its only purpose is to start the server.</li> </ul> <p>In your case, the solution may not even need coroutines as all you need to do is: (1) start the server and let it detach from your process (for example, using <code>popen</code>) and (2) work with your process using whatever communication protocol it requires (pipes, sockets, etc.).</p> <p>There are more complex and complete solutions (like <a href="https://github.com/LuaLanes/lanes" rel="nofollow">LuaLanes</a>) and also several good descriptions on creating <a href="http://williamaadams.wordpress.com/2013/01/30/lua-coroutines-getting-started/" rel="nofollow">simple coroutine dispatchers</a>.</p>
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