????接上一篇分析《skynet服务之launcher》，本篇我们继续来分析一下lua中的协程如何与服务有机结合的，关于lua中协程的解释参见本文《lua中协程的理解》；
上一篇分析到，当一个lua服务收到消息后，在lua层，最终会执行到raw_dispatch_message函数，代码如下：
localfunction raw_dispatch_message(prototype, msg, sz, session, source)
????-- skynet.PTYPE_RESPONSE = 1, read skynet.h
????if prototype ==1then--回应包
????????local co = session_id_coroutine[session]
????????if co =="BREAK"then
????????????session_id_coroutine[session]=nil
????????elseif co ==nilthen
????????????unknown_response(session, source, msg, sz)
????????else
????????????session_id_coroutine[session]=nil
????????????suspend(co, coroutine_resume(co,true, msg, sz))
????????end
????else
????????local p = proto[prototype]
????????if p ==nilthen
????????????if session ~=0then
????????????????c.send(source, skynet.PTYPE_ERROR, session,"")
????????????else
????????????????unknown_request(session, source, msg, sz, prototype)
????????????end
????????????return
????????end
????????local f = p.dispatch
????????if f then
????????????local ref = watching_service[source]
????????????if ref then
????????????????watching_service[source]= ref +1
????????????else
????????????????watching_service[source]=1
????????????end
????????????local co = co_create(f)
????????????session_coroutine_id[co]= session
????????????session_coroutine_address[co]= source
????????????suspend(co, coroutine_resume(co, session,source, p.unpack(msg,sz)))
????????elseif session ~=0then
????????????c.send(source, skynet.PTYPE_ERROR, session,"")
????????else
????????????unknown_request(session, source, msg, sz, proto[prototype].name)
????????end
????end
end
skynet服务之协程的威力
原文地址：http://www.cnblogs.com/skiing886/p/7761858.html