pcntl's use of zend_extension API

Andi or Zeev (Whoever has time for this), I have added an experimental process control module to cvs for fork() signals etc. In order for me to provide asynchronously safe signal handling I need to make sure that I never call the programmers php function during any of php's or Zend's internal updates. I am currently using the zend_extension_statement_handler for this purpose, but I have concerns about the efficiency of this. Since this adds additional op-codes, and was mainly intended for debug extensions, it seems that there should be a better hook more suited to what I am doing. I was thinking of a possible callback that could be placed in Zend's main execute loop. What do you guys think? Thanks, -Jason