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java線程池prestartCoreThread prestartAllCoreThreads的預(yù)熱源碼解讀

 更新時間：2023年10月24日 09:30:08   作者：codecraft  
這篇文章主要介紹了java線程池prestartCoreThread prestartAllCoreThreads的預(yù)熱源碼解讀,有需要的朋友可以借鑒參考下,希望能夠有所幫助,祝大家多多進步,早日升職加薪

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本文主要研究一下線程池的預(yù)熱

prestartCoreThread

java/util/concurrent/ThreadPoolExecutor.java

/**
     * Starts a core thread, causing it to idly wait for work. This
     * overrides the default policy of starting core threads only when
     * new tasks are executed. This method will return {@code false}
     * if all core threads have already been started.
     *
     * @return {@code true} if a thread was started
     */
    public boolean prestartCoreThread() {
        return workerCountOf(ctl.get()) < corePoolSize &&
            addWorker(null, true);
    }
ThreadPoolExecutor定義了prestartCoreThread，用于啟動一個核心線程

prestartAllCoreThreads

java/util/concurrent/ThreadPoolExecutor.java

/**
     * Starts all core threads, causing them to idly wait for work. This
     * overrides the default policy of starting core threads only when
     * new tasks are executed.
     *
     * @return the number of threads started
     */
    public int prestartAllCoreThreads() {
        int n = 0;
        while (addWorker(null, true))
            ++n;
        return n;
    }
prestartAllCoreThreads用于啟動所有的核心線程

小結(jié)

ThreadPoolExecutor提供了prestartCoreThread方法，用于啟動一個核心線程，提供了prestartAllCoreThreads方法用于啟動所有的核心線程。

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