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Common sense of thread pool

2022-04-23 06:09:00 【commonBean】

Threads do not distinguish between core and non core , The core is not created first , Beyond the number of core threads, non core threads are created , Which threads are retained eventually , Completely random .

allowCoreThreadTimeout You can set the core thread to recyclable , But it's not recommended .

When to recycle non core threads ？
see getTask() Method ：
When the number of frontline threads is greater than the number of core threads , When the work queue is empty , stay getTask() Call in method compareAndDecrementWorkerCount Method , Reduce the number of threads by one .getTask Method returns null after ,runWorker Method internal while The loop ends , perform processWorkerExit Methods from workers(HashSet) variable remove The worker.

maxPoolSize Is it the number of non core threads or the maximum total number of threads ？
Is the maximum number of threads , Number of non core threads =maxPoolSize-corePoolSize

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Common sense of thread pool

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