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- =================
- FastCGI Internals
- =================
- ---------------
- Module: fastcgi
- ---------------
- :Author: Jan Kneschke
- :Date: $Date: 2004/08/01 07:01:29 $
- :Revision: $Revision: 1.1 $
- :abstract:
- This is a short summary of the state-engine which is driving the FastCGI
- module. It describes the basic concepts and the way the different parts
- of the module are connected.
- .. meta::
- :keywords: lighttpd, state-engine, fastcgi
- .. contents:: Table of Contents
- Description
- ===========
- States
- ------
- The state-engine is currently made of 6 states which are walk-through on
- the way each connection.
- :init:
- prepare fastcgi-connection
- :connect:
- waiting for a connection
- :prepwrite:
- build the fastcgi-request
- :write:
- write the fastcgi-request to the network
- :read:
- read fastcgi-response from network and push it to the write-queue
- :close:
- terminate the connection
- .. image:: fastcgi-state.png
- Delays
- ------
- connect, write and read may need to wait for an fdevent. That's the reason
- for the loop in the state-diagram.
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