怎么用CAS写一个锁
本篇内容介绍了“怎么用CAS写一个锁”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
/** * @author mqgao * @version 1.0 * @date 2021/4/12 20:04 */public class MyLock { private static final Unsafe unsafe; private static final long valueOffset; static { try { Class<Unsafe> unsafeClass = Unsafe.class; Field theUnsafe = unsafeClass.getDeclaredField("theUnsafe"); theUnsafe.setAccessible(true); unsafe = (Unsafe) theUnsafe.get(null); valueOffset = unsafe.objectFieldOffset((AtomicInteger.class.getDeclaredField("value"))); }catch (Exception ex) { throw new Error(ex); } } private volatile int value = 0; public void lock() { for ( ; ; ) { if (unsafe.compareAndSwapInt(this, valueOffset, 0 , 1)) {return; } } } public void unlock() { value = 0; }
“怎么用CAS写一个锁”的内容就介绍到这里了,感谢大家的阅读。如果想了解更多行业相关的知识可以关注网站,小编将为大家输出更多高质量的实用文章!