* This method is not invoked for the main method thread or "system" * group threads created/set up by the VM. Any new functionality added * to this method in the future may have to also be added to the VM. * * A zero status value corresponds to state "NEW". */ if (threadStatus...
}else{try{//(9)blockingQueue.put(eventObject); }catch(InterruptedException e) {//Interruption of current thread when in doAppend method should notbe consumed//by AsyncAppenderThread.currentThread().interrupt(); } } } 如果neverBlock 被设置为false(默认为false)则会调用阻塞队列的put方法,而put 是阻...
ExtThreadPoolExecutor作用是对线程池的增强,如在初始化线程池时、在线程执行前、执行后等处可添加自定义逻辑。 public class ExtThreadPoolExecutor extends ThreadPoolExecutor{ public ExtThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueu...
ArrayBlockingQueue 一旦创建,容量不能改变。其并发控制采用可重入锁来控制,不管是插入操作还是读取操作,都需要获取到锁才能进行操作。当队列容量满时,尝试将元素放入队列将导致操作阻塞;尝试从一个空队列中取一个元素也会同样阻塞。 ArrayBlockingQueue 原理 LinkedBlockingQueue LinkedBlockingQueue 底层基于单向链表实现的...
[JDK] ThreadPoolExecutor 线程池配置 和 阻塞队列BlockingQueue 创建和配置 ExecutorService 执行器服务,它使用可能的几个池线程之一执行每个提交的任务,通常使用Executors工厂方法配置 线程池可以解决两个不同问题:由于减少了每个任务调用的开销,它们通常可以在执行大量异步任务时提供增强的性能,并且还可以提供绑定和管理资...
(3)SynchronousQueue:一个不存储元素的阻塞队列。每个插入操作必须等到另一个线程调用移除操作,否则插入操作一直处于阻塞状态,吞吐量通常要高于LinkedBlockingQueue,静态工厂方法 Executors.newCachedThreadPool() 使用了这个队列。 (4)PriorityBlockingQueue:一个具有优先级的无限阻塞队列。
Producer-consumer before Java 5: using a List with wait/notifyPre Java 5, the common way to implement a producer-consumer pattern was to use a plain old LinkedList with explicit synchronization. When we add a "job" to the list, we call notify(); in another thread, the consumer is ...
static final class QNode { volatile QNode next; // 可以看出来,等待队列是单向链表 volatile Object item; // CAS'ed to or from null volatile Thread waiter; // 将线程对象保存在这里,用于挂起和唤醒 final boolean isData; // 用于判断是写线程节点(isData == true),还是读线程节点 QNode(Object ...
public class SynchronousQueue<E> extends AbstractQueue<E> implements BlockingQueue<E>, java.io.Serializable { // ... static final class TransferQueue<E> extends Transferer<E> { static final class QNode { volatile QNode next; volatile Object item; volatile Thread waiter; final boolean isData...
BlockingQueueimplementations are thread-safe. All queuing methods achieve their effects atomically using internal locks or other forms of concurrency control. However, thebulkCollection operationsaddAll,containsAll,retainAllandremoveAllarenotnecessarily performed atomically unless specified otherwise in an implemen...