Being able to send certain jobs to certain threads

[GoogleCodeExporter]

I think it would be very useful if the job manager could have an array of 
different queues, and each thread could choose which queues it can get 
jobs from. That way it is possible to

1. create jobs that go to a specific thread (useful if all access to a 
certain resource (like a DirectX device) have to come from the same 
thread.)
2. create jobs that stay away from a specific thread (if you are running a 
game that needs to execute threads, but is doing background loading and 
decompression, you can allow maybe half of the threads to do loading 
tasks, but make sure that half of the threads are reserved for main game 
loop.

3. create multiple task priorities

Original issue reported on code.google.com by Shanni...@gmail.com on 5 Mar 2009 at 4:25