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Issue No. 02 - February (2012 vol. 23)
ISSN: 1045-9219
pp: 375-382
Mathieu Desnoyers , EfficiOS Inc., Montréal
Paul E. McKenney , IBM Linux Technology Center, Beaverton
Alan S. Stern , Rowland Institute at Harvard, Cambridge
Michel R. Dagenais , Ecole Polytechnique de Montréal, Montréal
Jonathan Walpole , Portland State University, Portland
Read-copy update (RCU) is a synchronization technique that often replaces reader-writer locking because RCU's read-side primitives are both wait-free and an order of magnitude faster than uncontended locking. Although RCU updates are relatively heavy weight, the importance of read-side performance is increasing as computing systems become more responsive to changes in their environments. RCU is heavily used in several kernel-level environments. Unfortunately, kernel-level implementations use facilities that are often unavailable to user applications. The few prior user-level RCU implementations either provided inefficient read-side primitives or restricted the application architecture. This paper fills this gap by describing efficient and flexible RCU implementations based on primitives commonly available to user-level applications. Finally, this paper compares these RCU implementations with each other and with standard locking, which enables choosing the best mechanism for a given workload. This work opens the door to widespread user-application use of RCU.
Synchronization, process management, operating systems, software/software engineering, threads, concurrency.

M. Desnoyers, M. R. Dagenais, J. Walpole, P. E. McKenney and A. S. Stern, "User-Level Implementations of Read-Copy Update," in IEEE Transactions on Parallel & Distributed Systems, vol. 23, no. , pp. 375-382, 2011.
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