main loop & asynchronous queues

[Thomas Stover <thomas wsinnovations com>]

Does glib allow for things like a two threaded program with inter-thread 
communication via async queues while each thread has a separate main 
loop waiting for both external stimulus and new queue messages to 
arrive? In other words, a) can a main loop be made to run a callback 
when a queue message arrives without polling (possibly futex based on 
linux), and b) can two threads each have a main loop?