These might allow you to write code: * That does more interesting things in signal handlers. * Makes more effective use of multiprocessors by allowing you to write clever lock-free code. Note that such code is very difficult to get right, and will unavoidably be less portable than lock-based code. It is also not always faster than lock-based code. But it may occasionally be a large performance win. * To experiment with new and much better thread programming paradigms, etc.

Includes: * Object-based software transactional memory * Multi-word compare-and-swap * Range of search structures (skip lists, binary search trees, red-black trees).