ExecutorService waitTermination 卡住了
我使用 Executors.newFixedThreadPool(2) 创建了一个固定大小的线程池，并执行了 10 个 Runnable 对象。我设置断点并跟踪执行过程。但是，即使所有任务都已完成，fixedSizeThreadPool.awaitTermination() 也不允许我继续。
基本上：
ExecutorService fixedThreadPool = Executors.newFixedThreadPool(2);
for (int i = 0; i < 10; ++i) {
fixedSizeThreadPool.execute(myRunables[i]);
}
try {
fixedSizeThreadPool.awaitTermination(timeout, timeoutUnits);
} catch (Exception e) { }
System.out.println("done!");
但这总是卡在 awaitTermination 上。怎么了？
I made a fixed size thread pool with Executors.newFixedThreadPool(2), and I executed 10 Runnable objects. I set breakpoints and traced through the execution. However, fixedSizeThreadPool.awaitTermination() does not allow me to continue even though all the tasks are done.
Basically:
ExecutorService fixedThreadPool = Executors.newFixedThreadPool(2);
for (int i = 0; i < 10; ++i) {
fixedSizeThreadPool.execute(myRunables[i]);
}
try {
fixedSizeThreadPool.awaitTermination(timeout, timeoutUnits);
} catch (Exception e) { }
System.out.println("done!");
But this always gets stuck on awaitTermination. What's wrong?
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评论（2）
您还可以使用 ExecutorService#invokeAll。它会阻塞，直到所有任务完成或达到超时。如果您的 ExecutorService 包含其他任务以及特别是计划任务，那么它比使用 shutdown 更干净一些。这些也会受到调用
shutdown的影响。You could also use ExecutorService#invokeAll. It blocks until all tasks are done or the timeout is reached. It's a little cleaner than using
shutdown, if your ExecutorService contains other tasks as well especially scheduled tasks. These would also be affected by a call toshutdown.正如 Peter 指出的，必须首先调用
shutdown()。来源： javadoc
As Peter pointed out,
shutdown()must be called first.source: javadoc