Lock reservation using cooperative multithreading and lightweight single reader reserved locks

Abstract

A method for lock reservation using cooperative multithreading is provided. The method includes analyzing code containing async points to support cooperative multithreading. The method also includes identifying a class of code as a candidate for reservation via determining locking properties within the code as a function of locations of async points within the code, and generating reserving code that reserves the shared object when code performing the reservation is considered hot code. The method further includes performing runtime monitoring of reservation performance to detect a contention level for the shared object, and removing the reservation when the runtime monitoring determines that a low level of contention exists. A method for lightweight single reader reserved locks is also provided, including identifying a candidate for reservation containing a read-only locking sequence, conditionally marling the sequence, and generating code using an artificial dependency to control execution order of out-of-line code.

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