自旋锁

.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

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+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/encodings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.wtd</groupId>
+    <artifactId>SpinLock</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>17</maven.compiler.source>
+        <maven.compiler.target>17</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

src/main/java/com/wtd/SpinLockDemo.java

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+package com.wtd;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+/**
+ * @program: SpinLock
+ * @description:
+ * @author: Mr.Wang
+ * @create: 2023-10-29 08:20
+ **/
+public class SpinLockDemo {
+    AtomicReference<Thread> atomicReference= new AtomicReference<>();
+    public void lock(){
+        Thread thread = Thread.currentThread();
+        System.out.println(Thread.currentThread().getName()+"\t"+"进来了");
+        while (!atomicReference.compareAndSet(null, thread)) {
+
+        }
+    }
+    public void unLock(){
+        Thread thread = Thread.currentThread();
+        atomicReference.compareAndSet(thread,null);
+        System.out.println(Thread.currentThread().getName()+"\t"+"走了");
+    }
+
+    public static void main(String[] args) {
+        SpinLockDemo spinLockDemo = new SpinLockDemo();
+        new Thread(()->{
+        spinLockDemo.lock();
+        try {
+            TimeUnit.SECONDS.sleep(5);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        spinLockDemo.unLock();
+        },"A").start();
+        try{
+            TimeUnit.MILLISECONDS.sleep(500);
+        }catch (InterruptedException e){
+            e.printStackTrace();
+        }
+        new Thread(()->{
+            spinLockDemo.lock();
+
+            spinLockDemo.unLock();
+        },"B").start();
+    }
+}