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.. There are five flavors of RCU available from liburcu, each of which can be selected on a per-compilation-unit basis as described below. QSBR provides the highest performance, but requires that all reader threads periodically indicate quiescent states via either rcuquiescentstate() for a momentary quiescent state or using rcuthreadoffline()/rcuthreadonline() pairs for extended quiescent states. The core API (Application Programming Interface) is quite small:. RCU is also the topic of one claim in the SCO v. This overview starts by showing how data can be safely inserted into and deleted from linked structures despite concurrent readers.
Please help by spinning off or relocating any relevant information, and removing excessive detail that may be against Wikipedia's inclusion policy. "Experience distributing objects in an SMMP OS". URCU library API The URCU library's API is surprisingly large, and will therefore be discussed in the following pieces: Atomic-operation and utility API Details of atomic-operation and utility API focused on memory barriers The URCU API RCU-Protected Lists Using URCU The following sections give some advice on the use of RCU: When is URCU useful? Application quiescent states Mixing and matching URCU flavors Building URCU When is URCU useful? RCU is a specialized synchronization mechanism, and its performance, scalability, and real-time response advantages are due to this specialization. doi:10.1145/1400097.1400099. ISBN1-59593-577-0. It allows extremely low overhead, wait-free reads. However, this approach requires that all threads, including those created by library functions, invoke rcuregisterthread() before entering their first RCU read-side critical section. In the second state, old readers might still be accessing elementB, but new readers have no path to it, hence the yellow color. A thread wishing to do this uses the following steps:. Lehman described use of garbage collectors to implement RCU-like access to a binary search tree. Udi Manber and Richard Ladner extended Kung's and Lehman's work to non-garbage-collected environments by deferring reclamation until all threads running at removal time have terminated, which works in environments that do not have long-lived threads. Richard Rashid et al.
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