[flintlock]

Unfortunately, SH4 isn't multithreaded (in the true sense of the term). SH4's code would require significant re-engineering to implement multithreading correctly, and that just likely wasn't in the cards with the accelerated development schedule this time around. Perhaps down the road some future version of SHx may be multithreaded.

As multi-core processors become more popular by the day, I would be surprised if the next incarnation of SHx wasn't designed from the ground up as a multithreaded app.