随笔分类 - 源码
摘要：Semaphore https://www.bilibili.com/video/BV1Ae411C7xr/ public class Semaphore implements java.io.Serializable 同Reetrantlock在Sync 继承AQS abstract static
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摘要：public class ThreadPoolExecutor extends AbstractExecutorService private final AtomicInteger ctl = new AtomicInteger(ctlOf(RUNNING, 0)); ctl int32位 高3位
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摘要：ThreadLocal set public void set(T value) { Thread t = Thread.currentThread(); ThreadLocalMap map = getMap(t); if (map != null) //map不为null,之前设置过情况 map
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