Blocking Plugins

[Martin Atkins]

Brad Fitzpatrick wrote:
> They'll be transparently run in a child process if you declare it
> blocking.  I was gonna try to finish that today, but keep getting
> interrupted.
> 

Perhaps it would be better to have this flag set at the hook level 
rather than the plugin level? It's quite likely that there'll be a 
plugin that has a few blocking operations but also a some really simple 
ones that would get dwarfed by the overhead of all of this forking and 
socket communication.

Could maybe just be a flag passed in to VHost->register_hook?