Name
relay_switch_subbuf — 
     switch to a new sub-buffer
 
Synopsis
| size_t relay_switch_subbuf ( | struct rchan_buf * buf, | 
|  | size_t length ); | 
 
Arguments
- buf
- 
     channel buffer
     
- length
- 
     size of current event
     
Description
   Returns either the length passed in or 0 if full.
   
   Performs sub-buffer-switch tasks such as invoking callbacks,
   updating padding counts, waking up readers, etc.