Async I/O support attempt for Chromium

I think I can get the SDP layer kicked over to Asynchronous I/O (AIO), 
but I only know how to do this for Linux.  Does anyone out there know 
how to get documentation on AIO for other Unix systems?  In theory, this 
should also work for tcp and allow a cleaner way to handle non-blocking 
i/o without resulting to threads.

Setting the sockets to O_NONBLOCK doesn't seem to help as the sockets 
run out of buffer space quickly and revert back to blocking.  e.g. write 
returns E_WOULDBLOCK.

Once I can get crserver to stop segfaulting, I can continue to work on 
this in my spare time.

-Mike


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