I'm pretty convinced transactional memory is a bunch of crap, frankly.
Update: I'm no longer convinced... Dank 21:53, 13 October 2009 (UTC)
GCC supports x86 transactional memory as of November 2011 via the -fgnu-tm command line option.
- Intel Transactional Memory ABI document
- James Reinders' "Coarse-grained locks and Transactional Synchronization explained"
- Greg Pfister's "Memory in Intel Haswell: The Good, and a Possible Ugly"