Grand Central

[David Chisnall]

In case anyone hasn't seen this, Apple have published a few more  
details about Grand Central:

http://images.apple.com/macosx/technology/docs/GrandCentral_TB_brief_20090608.pdf

There is no API documentation yet, but it seems that it basically  
spawns a set of threads at different priorities and uses them to run  
blocks from various queues.  Lots of hype, but it doesn't seem to give  
anything that we can't already do with EtoileThread and clang (we  
already have an implementation of blocks and an efficient way of  
passing objects between threads - see ETThread and MKObjectPipe).

The most important improvement is hidden right at the bottom of the  
document; there is now a queue associated with the main thread, so  
there is a standard way of running arbitrary code at the end of the  
next run loop.

David