On Wed, Aug 18, 2010 at 12:15:09PM -0700, Peter W Schultz wrote: > How would I go about modifying the qemu source to implement SWP > atomically? I have been studying the source for a few days now, and I > am at a loss as to what all needs to be done.
You should look at how the load/store-exclusive instructions work and see if you can use a similar mechanism. It should be fairly straightforward. > I feel it would be most desirable to add a TCG_SWAP instruction that > is guaranteed to be an atomic compare-and-swap, and implement that as > needed. I believe there was an thread several months ago discussing doing this or something similar and it was decided that mechanism was not the way to go. -Nathan
