communication between worker processes

[Leo P.]

How might I be able to send a message or (custom) event to some given 
worker process? I am storing pointers to requests (and the workers that 
processed them) in shared memory for a module ( 
http://github.com/slact/nginx_http_push_module ), and need to alert said 
workers to respond to said requests, from the context of a location 
request handler in a module. (maybe using ngx_channel stuff?)
I'd really appreciate any suggestions.

Thanque,
  - Leo

(PS: for reference, here was my original question: 
http://forum.nginx.org/read.php?2,14802 )