1. Before processing
- if list_in is empty
- Add all requests in list_out to list_in, empty list_out
- for each request in list_in
- set hooks'in_progress flag to TRUE
1. Before processing
- if list_in is empty
- Add all requests in list_out to list_in, empty list_out
- for each request in list_in
- set hooks'in_progress flag to TRUE