Modular transactions - bounding mixed races in space and time.

We define local transactional race freedom (LTRF), which provides a programmer model for software transactional memory. LTRF programs satisfy the SC-LTRF property, thus allowing the programmer to focus on sequential executions in which transactions execute atomically. Unlike previous results, SC-LTRF does not require global race freedom. We also provide a lower-level implementation model to reason about quiescence fences and validate numerous compiler optimizations.