19. The one or more non-transitory, machine-readable storage media of claim 18 , wherein to execute the handler code comprises to: perform a read barrier operation selected from a group consisting of a logging operation to log the first read operation, a lock acquire operation to acquire a lock for the first read operation, and a store operation to update a transaction descriptor associated with the transaction.
18. The one or more non-transitory, machine-readable storage media of claim 12 , wherein the transactional memory access instruction comprises a first read operation and the handler code comprises a read handler.