From 44f0966f15f50fc6d979909c225c4409cacbbce3 Mon Sep 17 00:00:00 2001
From: Wtd <1658714322@qq.com>
Date: Sun, 29 Oct 2023 09:05:34 +0800
Subject: [PATCH] =?UTF-8?q?=E8=87=AA=E6=97=8B=E9=94=81?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .gitignore                              | 38 +++++++++++++++++++
 .idea/.gitignore                        |  8 ++++
 .idea/encodings.xml                     |  7 ++++
 .idea/misc.xml                          | 14 +++++++
 pom.xml                                 | 17 +++++++++
 src/main/java/com/wtd/SpinLockDemo.java | 49 +++++++++++++++++++++++++
 6 files changed, 133 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .idea/.gitignore
 create mode 100644 .idea/encodings.xml
 create mode 100644 .idea/misc.xml
 create mode 100644 pom.xml
 create mode 100644 src/main/java/com/wtd/SpinLockDemo.java

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5ff6309
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,38 @@
+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
\ No newline at end of file
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..35410ca
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,8 @@
+# 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
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
new file mode 100644
index 0000000..aa00ffa
--- /dev/null
+++ b/.idea/encodings.xml
@@ -0,0 +1,7 @@
+<?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>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..82dbec8
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,14 @@
+<?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>
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000..d9a414b
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,17 @@
+<?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>
diff --git a/src/main/java/com/wtd/SpinLockDemo.java b/src/main/java/com/wtd/SpinLockDemo.java
new file mode 100644
index 0000000..a746daf
--- /dev/null
+++ b/src/main/java/com/wtd/SpinLockDemo.java
@@ -0,0 +1,49 @@
+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();
+    }
+}