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Four commonly used Java thread lock characteristics and use scenarios and performance comparison, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can get something.

The characteristics of four commonly used Java thread locks, performance comparison and reasons for multithreading in use scenarios

After the emergence of the process, the performance of the operating system has been greatly improved. Although the emergence of processes has solved the concurrency problem of the operating system, people are still not satisfied, and people gradually have requirements for real-time performance.

One of the reasons for using multithreading is that it is a very inexpensive, fast switching, and more "frugal" multitasking operation than a process.

In Linux system, starting a new process must be assigned an independent address space, and a large number of data tables are established to maintain its code segment, stack segment and data segment, which is an "expensive" multitasking mode. While running multiple threads in a process at the same time, they use the same address space with each other, share most of the data, and the space it takes to start a thread is much less than the space it takes to start a process, and the time it takes for threads to switch from one to another is also much less than the time it takes to switch between processes.

Problems faced by multithreading concurrency

Because multiple threads share the resources and address space of their processes, there is a problem:

What if multiple threads want to access a resource at the same time?

In Java concurrent programming, it is often encountered that multiple threads access the same shared resource. At this time, developers must consider how to maintain data consistency, which is the source of Java locking mechanism (synchronization problem).

Java provides a variety of ways to implement multithreaded locking mechanisms, including:

Synchronized

ReentrantLock

Semaphore

AtomicInteger et al.

Each mechanism has its own advantages and disadvantages and its own applicable scenarios, and their characteristics must be skillfully mastered in order to be handy in the development of Java multithreaded applications.

4 Java thread locks (thread synchronization)

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