启动一个线程两次会怎样呢

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罗罗的1024 2021-08-27 10:15:39 博主文章分类：多线程与并发 ©著作权

文章标签 多线程 java 并发编程 sed 线程状态 文章分类 代码人生

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多次启动一个线程会是怎么样呢，我们看看源码是怎么说的

/**
     * It is never legal to start a thread more than once.
     * In particular, a thread may not be restarted once it has completed execution.
     启动一个线程不止一次是不合法的。特别是，线程一旦完成执行就不能重新启动
     * @exception  IllegalThreadStateException  if the thread was already started.
     */
    public synchronized void start() {
        /**
         * A zero status value corresponds to state "NEW"
         * 0的状态表示新建(new)
         */
        if (threadStatus != 0)
            throw new IllegalThreadStateException();

        group.add(this);

        boolean started = false;
        try {
            start0();//这是一个本地方法
            started = true;
        } finally {
            try {
                if (!started) {
                    group.threadStartFailed(this);
                }
            } catch (Throwable ignore) {
                /* do nothing. If start0 threw a Throwable then it will be passed up the call stack */
            }
        }
    }