commit 507f7c7275ee989792980653a4c23372e77189de
Author: life <1733802689@qq.com>
Date: Sat Oct 28 14:57:21 2023 +0800
手写自旋锁
diff --git a/.gitignore b/.gitignore
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--- /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
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diff --git a/.idea/.gitignore b/.idea/.gitignore
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--- /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
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index 0000000..aa00ffa
--- /dev/null
+++ b/.idea/encodings.xml
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+
+
+
+
+
+
+
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diff --git a/.idea/misc.xml b/.idea/misc.xml
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index 0000000..82dbec8
--- /dev/null
+++ b/.idea/misc.xml
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+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
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index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
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+
+
+
+
+
+
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diff --git a/pom.xml b/pom.xml
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--- /dev/null
+++ b/pom.xml
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+
+
+ 4.0.0
+
+ org.example
+ weekly
+ 1.0-SNAPSHOT
+
+
+ 17
+ 17
+ UTF-8
+
+
+
diff --git a/src/main/java/org/example/Main.java b/src/main/java/org/example/Main.java
new file mode 100644
index 0000000..cf9f6fc
--- /dev/null
+++ b/src/main/java/org/example/Main.java
@@ -0,0 +1,45 @@
+package org.example;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+public class Main {
+ AtomicReference atomicReference = new AtomicReference<>();
+
+ public void lock() {
+ Thread threadA = Thread.currentThread();
+ //假如线程A先进入锁
+ System.out.printf(Thread.currentThread().getName() + "\t" + "----------come in"+"\n");
+ while (!atomicReference.compareAndSet(null, threadA)) {
+ //期望值为null 更新值为线程A自己
+ //线程A持有锁成功
+ }
+ }
+
+ public void unlock() {
+ Thread threadA = Thread.currentThread();
+ //线程A肯定希望出来的是自己，线程A一走锁就空了
+ //使用期望值为线程A自己 更新值为null
+ atomicReference.compareAndSet(threadA, null);
+ System.out.printf(Thread.currentThread().getName() + "\t" + "----------task over,unlock"+"\n");
+
+
+ }
+
+ public static void main(String[] args) {
+ Main main = new Main();
+ new Thread(() -> {
+ main.lock();
+ //暂停几秒钟线程
+ try {TimeUnit.SECONDS.sleep(5);} catch (InterruptedException e) {e.printStackTrace();}
+ main.unlock();
+ }, "A").start();
+ //线程A先于线程B启动
+ try {TimeUnit.MILLISECONDS.sleep(500);} catch (InterruptedException e) {e.printStackTrace();}
+ new Thread(() -> {
+ main.lock();
+ main.unlock();
+ }, "B").start();
+
+ }
+}