摘要 : Read-copy update (RCU) is a shared memory synchronization mechanism with scalable synchronization-free reads that nevertheless execute correctly with concurrent updates. To guarantee the consistency of such reads, an RCU update tr... 展开 Read-copy update (RCU) is a shared memory synchronization mechanism with scalable synchronization-free reads that nevertheless execute correctly with concurrent updates. To guarantee the consistency of such reads, an RCU update transitioning the data structure between certain states must wait for the completion of all existing reads. Unfortunately, these waiting periods quickly become a bottleneck, and thus RCU remains unused in data structures that require scalable, fine-grained, update operations. 收起