public class PollQueueThread extends Thread { private Queue queue; public PollQueueThread(Queue queue){ this.queue = queue; } @Override public void run() { while(true){ try { Object el = queue.poll(); if(null ==
/** Lock held by take, poll, etc */privatefinalReentrantLock takeLock = newReentrantLock();/** Wait queue for waiting takes */privatefinalCondition not...
System.nanoTime() + nanos : 0L;//获取当前线程Thread w =Thread.currentThread();intspins = -1;//initialized after first item and cancel checksThreadLocalRandom randomYields =null;//bound if neededfor(;;) {//等待节点的当前数据Object item =s.item;//如果是take和timed poll方法,e为null。也...
Future<Integer> returnedElement = executorService.submit(pollTask); assertThat(returnedElement.get().intValue(), is(equalTo(element))); The first task,offerTask, adds an element to the queue, and the second task,pollTask,retrieve an element from the queue. The poll task additionallychecks the...
首先,ConcurrentLinkedQueue相对阻塞队列来说,采用的是CAS无锁操作,没有take和put方法,主用poll与offer,无界。有人说,既然此队列内部进队和出队操作采用的是无锁,那性能肯定比有锁的BlockingQueue强,那BlockingQueue还有啥用武之地,其实不然,有些时候我们就需要线程进入阻塞状态而非不断自旋消耗CPU,我们可以归类以下...