} else if (mark->has_locker() && THREAD->is_lock_owned((address)mark->locker())) { assert(lock != mark->locker(), "must not re-lock the same lock"); assert(lock != (BasicLock*)obj->mark(), "don't relock with sam
AI代码解释 publicclassDemo{publicstaticint count;publicstaticvoidmain(String[]args){Object locker=newObject();Thread t1=newThread(()->{synchronized(locker){for(int i=0;i<50000;i++){synchronized(locker){synchronized(locker){count++;}}}System.out.println("t1 结束");});t1.start();}} 不可...
synchronized(syncLocker){ // 第二重判断 if (instance == null){ instance = new LoadBalancer(); } } } return instance; } 二、volatile关键字虽然不具备synchronized关键字的原子性(同步)但其主要作用就是使变量在多个线程中可见。也就是可见性。用法很简单,直接用来修饰变量。因为其不具备原子性。 volati...
JavaThread* biased_thread = mark->biased_locker(); if (biased_thread == NULL) { // 匿名偏向。当调用锁对象的hashcode()方法可能会导致走到这个逻辑 // 如果不允许重偏向,则将对象的mark word设置为无锁模式 if (!allow_rebias) { obj->set_mark(unbiased_prototype); } ... return BiasedLocking...
synchronized (locker2){ try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } synchronized (locker1){ System.out.println("t2获取到了两把锁"); } } }); t1.start(); t2.start(); } } 1. 2. 3. ...
{// 锁升级失败,也就是不需要升级锁,表示当前线程已经获取锁了// 不需要再获取相同的锁,相当于重入锁/锁消除,直接设置对应的线程栈帧的displaced_mark_word为nullassert(lock!=mark.locker(),"must not re-lock the same lock");assert(lock!=(BasicLock*)obj->mark().value(),"don't relock with ...
synchronized (locker) { System.out.println(new Date() + " 开始休眠" + Thread.currentThread().getName()); count++; try { Thread.sleep(10000); System.out.println(new Date() + " 结束休眠" + Thread.currentThread().getName());
public class ThreadDemo1 {public static void main(String[] args) {Object locker = new Object();Thread t1 = new Thread(() -> {synchronized(locker) {synchronized (locker) {System.out.println("hello");}}});t1.start();}} 看到这段代码,同一个线程用同一个对象加锁两次,我们的第一反应是不...
private static Object locker = new Object();public static void main(String[] args) {synchronized (locker) {synchronized (locker) {}}} 形如这样的代码,就是一个线程连续对一把锁加锁两次 加锁的时候判定一下看当前申请锁的线程是不是锁的拥有者(第一次加锁的线程) ...
synchronized (locker) {System.out.println(newDate() +" 开始休眠"+Thread.currentThread().getName()); count++;try{Thread.sleep(10000);System.out.println(newDate() +" 结束休眠"+Thread.currentThread().getName()); }catch(InterruptedExceptione) { ...