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本文主要研究一下线程池的预热
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定义了prestartCoreThread，用于启动一个核心线程
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用于启动所有的核心线程文章来源：https://www.toymoban.com/news/detail-721439.html
小结
ThreadPoolExecutor提供了prestartCoreThread方法，用于启动一个核心线程，提供了prestartAllCoreThreads方法用于启动所有的核心线程。文章来源地址https://www.toymoban.com/news/detail-721439.html
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