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    1: =================
    2: FastCGI Internals
    3: =================
    4: 
    5: ---------------
    6: Module: fastcgi
    7: ---------------
    8: 
    9: :Author: Jan Kneschke
   10: :Date: $Date: 2013/10/14 10:32:48 $
   11: :Revision: $Revision: 1.1.1.1 $
   12: 
   13: :abstract:
   14:   This is a short summary of the state-engine which is driving the FastCGI
   15:   module. It describes the basic concepts and the way the different parts
   16:   of the module are connected.
   17: 
   18: .. meta::
   19:   :keywords: lighttpd, state-engine, fastcgi
   20: 
   21: .. contents:: Table of Contents
   22: 
   23: Description
   24: ===========
   25: 
   26: States
   27: ------
   28: 
   29: The state-engine is currently made of 6 states which are walk-through on
   30: the way each connection.
   31: 
   32: :init:
   33:   prepare fastcgi-connection
   34: :connect:
   35:   waiting for a connection
   36: :prepwrite:
   37:   build the fastcgi-request
   38: :write:
   39:   write the fastcgi-request to the network
   40: :read:
   41:   read fastcgi-response from network and push it to the write-queue
   42: :close:
   43:   terminate the connection
   44: 
   45: .. image:: fastcgi-state.png
   46: 
   47: Delays
   48: ------
   49: 
   50: connect, write and read may need to wait for an fdevent. That's the reason
   51: for the loop in the state-diagram.