Synchronized lock degradation method and device based on JVM Markword and medium

Abstract

A Synchronized lock degradation method based on JVM Markword comprises the steps that object header information of an object is obtained, and an object header data structure of the object is constructed in JVM according to the object header information of the object; in response to completion of construction of the object header data structure, establishing a lock record information table of the object according to the object header data structure; updating the locking times of the thread in a lock record information table of the object according to the locking type access times of the thread to the object; and degrading the object lock of the object into a lightweight lock in response to the condition that the object lock of the object is a weight lock and the number of locking times of the thread in the lock record information table of the object reaches a preset number of times. Through the method provided by the invention, the problem that the lock of the object cannot be degraded in the prior art can be effectively solved, the running efficiency of the Java program is improved, and the method does not depend on the compatibility of a third-party library, and is efficient and convenient.

Description

technical field [0001] The invention belongs to the field of computers, and in particular relates to a JVM Markword-based Synchronized lock downgrade method, equipment and media. Background technique [0002] The artificial intelligence platform is built using Java as the basic development language. In multi-threaded concurrent business scenarios, the R&D team uses the synchronized keyword in Java to achieve thread synchronization and ensure the correctness of business data. JDK itself has made a lot of optimizations for synchronized, including lock upgrades (lock-free---biased lock---lightweight lock---heavyweight lock), but it does not support lock downgrade, which leads to high concurrency scenarios In this case, the platform service is obviously stuck, which seriously affects the user experience. The third-party framework and the display lock of Java itself can solve the above problems to a certain extent, but the cost of modification is relatively high, and it needs to...

AI Technical Summary

Problems solved by technology

JDK itself has made a lot of optimizations for synchronized, including lock upgrades (lock-free---biased lock---lightweight lock---heavyweight lock), but it does not support lock downgrade, which leads to high concurrency scenarios In this case, the platform service is obviously stuck, which seriously affects the user experience

The third-party framework and the display lock of Java itself can solve the above problems to a certain extent, but the cost of modification is relatively high, and it needs to be reset every time the code is written, and the scope of automatic testing is relatively large

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