05 2021 档案

CyclieBarrier::dowait 代码笔记
摘要：private final ReentrantLock lock = new ReentrantLock(); private static class Generation { Generation() {} boolean broken; } private Generation generat 阅读全文
posted @ 2021-05-28 10:52 榆木脑袋0v0 阅读(115) 评论(0) 推荐(0)
ReentrantReadWriteLock.Sync::tryReadLock 源码学习
摘要：@ReservedStackAccess final boolean tryReadLock() { Thread current = Thread.currentThread(); // 死循环 for (;;) { int c = getState(); // 当前有别的线程持有写锁，此时尝试获 阅读全文
posted @ 2021-05-20 21:01 榆木脑袋0v0 阅读(68) 评论(0) 推荐(0)
ReentrantReadWriteLock.Sync::tryAcquireShared 源码笔记
摘要：static final class ThreadLocalHoldCounter extends ThreadLocal<HoldCounter> { public HoldCounter initialValue() { return new HoldCounter(); } } private 阅读全文
posted @ 2021-05-19 13:28 榆木脑袋0v0 阅读(375) 评论(0) 推荐(0)
ReentrantReadWriteLock.Sync::tryReleaseShared 源码笔记
摘要：static final class ThreadLocalHoldCounter extends ThreadLocal<HoldCounter> { public HoldCounter initialValue() { return new HoldCounter(); } } private 阅读全文
posted @ 2021-05-18 14:05 榆木脑袋0v0 阅读(173) 评论(0) 推荐(0)
ReentrantReadWriteLock.Sync::tryAcquire
摘要：// 尝试获取写锁 protected final boolean tryAcquire(int acquires) { Thread current = Thread.currentThread(); int c = getState(); // 全状态 int w = exclusiveCoun 阅读全文
posted @ 2021-05-17 17:09 榆木脑袋0v0 阅读(71) 评论(0) 推荐(0)
ReentrantReadWriteLock.Sync 的状态表示方法
摘要：ReentrantReadWriteLock.Sync的状态为一个32位整数。分为两部分，每部分16位，1~16位为写锁的重入次数，17~32位为读锁的获取次数。 阅读全文
posted @ 2021-05-17 16:50 榆木脑袋0v0 阅读(66) 评论(0) 推荐(0)
ReentrantLock.FairSync::initialTryLock源码笔记
摘要：// ReentrantLock.FairSync::initialTryLock final boolean initialTryLock() { Thread current = Thread.currentThread(); int c = getState(); // c==0说明当前锁无人 阅读全文
posted @ 2021-05-06 14:38 榆木脑袋0v0 阅读(85) 评论(0) 推荐(0)
ReentrantLock.Sync::tryRelease源码阅读
摘要：// 尝试释放锁 protected final boolean tryRelease(int releases) { // c:释放锁后的新state int c = getState() - releases; if (getExclusiveOwnerThread() != Thread.cu 阅读全文
posted @ 2021-05-06 14:25 榆木脑袋0v0 阅读(69) 评论(0) 推荐(0)