To borrow words from Java concurrent programming practice; it is not easy to write correct programs, and even harder to write normal concurrent programs; the thread safety issue of multithreading is subtle and unexpected compared to the case of sequential execution, because The order of operations in multiple threads is unpredictable without proper synchronization.
Compared with other knowledge points in Java, concurrent programming has a relatively high threshold for learning, and it is more laborious to learn, which leads to many people being discouraged; however, both workplace interviews and the implementation of high-concurrency and high-traffic systems are inseparable from concurrent programming. As a result, talents who can truly master concurrent programming have become an urgent need in the market.
This Chat, as a necessary basic upgrade of concurrent programming in the beauty of Java concurrent programming series, will talk to you about the advanced basic knowledge involved in multi-threaded concurrent programming in an easy-to-understand way (it is recommended to read the beauty of concurrent programming in Java: thread related basic knowledge
), as follows:
- What is multithreaded concurrency and parallelism.
- What is thread safety issue.
- What is the memory visibility problem of shared variables.
- What is atomic operation in Java, AtomicLong implementation principle.
- What is CAS operation in Java.
- What is Java instruction reordering.
- What are the memory semantics of the Synchronized keyword in Java.
- What are the memory semantics of the Volatile keyword in Java.
- What is false sharing, why it happens, and how to avoid it
- What are reentrant locks, optimistic locks, pessimistic locks, fair locks, unfair locks, exclusive locks, and shared locks.
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