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Within a lock-based critical section, it is perfectly legal to manipulate variables that are concurrently accessed or even modified outside that lock's critical section, with one common example being statistical counters. The same thing is possible within RCU read-side critical sections, and is in fact the common case.

Given mechanisms like the so-called “dirty reads” that are prevalent in production database systems, it is not surprising that extra-transactional accesses have received serious attention from the proponents of TM, with the concepts of weak and strong atomicity being but one case in point.

So what can TM do about extra-transactional accesses?