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The author reviews the free online textbook 'Is Parallel Programming Hard, And, If So, What Can You Do About It?' by Paul E. McKenney, discussing its focus on lock-free concurrency and CPU cache effects, and shares personal context about reading it during a vacation.
Paul McKenney discusses unconventional and corner-case RCU (Read-Copy-Update) implementations, including timed-wait RCU approaches used in early Unix systems and fixed-buffer RCU concepts related to memory quarantining, illustrating creative but potentially dangerous synchronization techniques in kernel development.