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‎README.md

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@@ -39,20 +39,18 @@ WeChat:Zed-RD [![Build Status](https://travis-ci.org/Fadezed/concurrency.svg?br
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## 缓存导致的可见性问题
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* 一个线程对共享变量的修改，另外一个线程能够立刻看到，我们称为**可见性**
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/visibility/Visibility.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/visibility/Visibility.java)
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![单核CPU](media/15603316282468/a07e8182819e2b260ce85b2167d446da.png)
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![多核CPU](media/15603316282468/e2aa76928b2bc135e08e7590ca36e0ea.png)
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## 线程切换带来的原子性问题
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* 一个或者多个操作在 CPU 执行的过程中不被中断的特性称为**原子性**
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* **时间片**概念
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* 线程切换 ---〉提升cpu利用率。 tips:Unix系统因支持多进程分时复用而出名。
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* 线程切换[代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/contentSwitch/ContentSwitchTest.java)。
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* 原子问题[代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/atomic/AtomicCounter.java)
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* 线程切换[代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/contentswitch/ContentSwitchTest.java)。
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* 原子问题[代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/atomic/AtomicCounter.java)
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![254b129b145d80e9bb74123d6e620efb](media/15603316282468/254b129b145d80e9bb74123d6e620efb.png)
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* count+=1 操作分析
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## 按需禁用缓存以及编译优化 [代码来源](http://www.cs.umd.edu/~pugh/java/memoryModel/jsr-133-faq.html)
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* ## volatile
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/volatileExample/VolatileExample.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/volatilecase/VolatileExample.java)
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* ## synchronized
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* 偏向锁
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* 轻量级锁
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* 重量级锁
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/synchronizedEx/SynchronizedExample.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/synchronizedcase/SynchronizedExample.java)
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```
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class X {
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## final
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/finalEx/FinalExample.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/finalcase/FinalExample.java)
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* 修饰变量时，初衷是告诉编译器：这个变量生而不变，非immutable，即只能表示对象引用不能被赋值（例如List）；
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* 修饰方法则方法不能被重写
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* 修饰类则不能被扩展继承。
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# 4.JAVA线程的生命周期
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/threadState/ThreadState.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/threadstate/ThreadState.java)
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## 通用的线程生命周期
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* 初始状态
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### 使用方法
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#### 实现互斥
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#### 实现限流器（Semaphore 可以允许多个线程访问一个临界区）
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/semaphore/SemaphoreEx.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/semaphore/SemaphoreEx.java)
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* 只允许一个线程写共享变量
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* 如果一个写线程正在执行写操作，此时禁止读线程读共享变量
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/readWriteLock/CacheByReadWriteLock.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/readwritelock/CacheByReadWriteLock.java)
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## StampedLock 加上乐观读（无锁）
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/readWriteLock/StampedLockEx.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/readwritelock/StampedLockEx.java)
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## CountDownLatch
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/countDownLatchEx/CountDownLatchEx.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/countdownlatch/CountDownLatchEx.java)
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## CyclicBarrier
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/cyclicBarrierEx/CyclicBarrierEx.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/cyclicbarrier/CyclicBarrierEx.java)
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# 11. 原子类
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* 无锁方案实现原理（Compare And Swap）
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/atomic/SimulatedCAS.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/atomic/SimulatedCompareAndSwap.java)
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* 概览图
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![atomi](media/15608379390765/atomic.png)
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* 而创建一个线程，却需要调用操作系统内核的 API，然后操作系统要为线程分配一系列的资源，这个成本就很高了。
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## 线程池是一种生产者-消费者模式（非一般意义池化资源）
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/threadPool/MyThreadPool.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/threadPool/MyThreadPool.java)
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* Java ThreadPoolExecutor
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```
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## FutureTask工具类（实现了RunnableFuture而它继承了Runnable和Future接口）
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/futureTask/FutureTaskEx.java)
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* [代码示例](https://github.com/Fadezed/concurrency/blob/master/src/main/java/com/example/concurrency/features/futuretask/FutureTaskEx.java)
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* 构造函数类似线程池submit
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```

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