Linearizable libraries provide operations that appear to execute atomically. Clients, however, may need to execute a sequence of operations (a composite operation) atomically. We consider the problem of extending a linearizable library to support arbitrary atomic composite operations by clients. We introduce a novel approach in which the concurrent library ensures atomicity of composite operations by exploiting information (foresight) provided by its clients. We use a correctness condition, based on a notion of dynamic rightmovers, that guarantees that composite operations execute atomically without deadlocks, and without using rollbacks. We present a static analysis to infer the foresight information required by our approach, allowing a compiler to automatically insert the foresight information into the client. This relieves the client programmer of this burden and simplifies writing client code. We present a generic technique for extending the library implementation to realize foresight-based synchronization. This technique is used to implement a general-purpose Java library for Map data structures \u2014 the library permits composite operations to simultaneously work with multiple instances of Map data structures. We use the Maps library and the static analysis to enforce atomicity of a wide selection of real-life Java composite operations. Our experiments indicate that our approach enables realizing efficient and scalable synchronization for real-life composite operations.<\/p>\n","protected":false},"excerpt":{"rendered":"
Linearizable libraries provide operations that appear to execute atomically. Clients, however, may need to execute a sequence of operations (a composite operation) atomically. We consider the problem of extending a linearizable library to support arbitrary atomic composite operations by clients. We introduce a novel approach in which the concurrent library ensures atomicity of composite operations […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":[{"type":"text","value":"Guy Golan-Gueta"},{"type":"text","value":"G. 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