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This article mainly introduces the java how to achieve reentrant spin lock related knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that after reading this java how to achieve reentrant spin lock article will have a harvest, let's take a look.

Description

1. It means that the thread trying to acquire the lock will not be blocked, but will acquire the lock through a loop.

2. Advantages: reduce the consumption of context switching.

Cons: cycle consumption of CPU.

Example

Public class ReentrantSpinLock {private AtomicReference owner = new AtomicReference (); / / number of reentrants private int count = 0; / / Lock public void lock () {Thread current = Thread.currentThread (); if (owner.get () = = current) {count++; return } while (! owner.compareAndSet (null, current)) {System.out.println ("--I'm spinning--");}} / / unlock public void unLock () {Thread current = Thread.currentThread () / / only threads holding locks can unlock if (owner.get () = = current) {if (count > 0) {count--;} else {/ / there is no CAS operation here, because there is no competition, because only thread holders can unlock owner.set (null). } public static void main (String [] args) {ReentrantSpinLock spinLock = new ReentrantSpinLock (); Runnable runnable = ()-> {System.out.println (Thread.currentThread (). GetName () + "start trying to acquire spin lock"); spinLock.lock () Try {System.out.println (Thread.currentThread (). GetName () + "spin lock acquired"); Thread.sleep (4000);} catch (InterruptedException e) {e.printStackTrace ();} finally {spinLock.unLock () System.out.println (Thread.currentThread (). GetName () + "spin lock released");}}; Thread thread1 = new Thread (runnable); Thread thread2 = new Thread (runnable); thread1.start (); thread2.start () }} this is the end of the article on "how to implement reentrant spin locks in java". Thank you for reading! I believe you all have a certain understanding of the knowledge of "how to achieve reentrant spin locks in java". If you want to learn more, you are welcome to follow the industry information channel.

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