jdk线程池的核心代码

ThreadPoolExecutor的核心部分主要有以下几点：

1 线程池中工作线程的数量，源码的execute方法中有如下记载：

         * Proceed in 3 steps:
         *
         * 1. If fewer than corePoolSize threads are running, try to
         * start a new thread with the given command as its first
         * task.  The call to addWorker atomically checks runState and
         * workerCount, and so prevents false alarms that would add
         * threads when it shouldn't, by returning false.
         *
         * 2. If a task can be successfully queued, then we still need
         * to double-check whether we should have added a thread
         * (because existing ones died since last checking) or that
         * the pool shut down since entry into this method. So we
         * recheck state and if necessary roll back the enqueuing if
         * stopped, or start a new thread if there are none.
         *
         * 3. If we cannot queue task, then we try to add a new
         * thread.  If it fails, we know we are shut down or saturated
         * and so reject the task.
         */

2 任务队列，线程池维护的是一个阻塞队列，BlockingQueue<Runnable> workQueue，用来保存task，这个阻塞很重要。

补充：综合编程 , 其他综合 ,

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