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多线程-并发并行-线程进程
2022-06-28 09:21:00 【用户9857551】
多线程
并发:两个或多个事件在同一个时间段发生。 并行:两个或多个事件在同一时刻发生(同时发生)。
进程:一个正在运行的应用程序就是一个进程。 线程:是进程的一个执行单元。一个进程至少有一个线程,可以有多个线程,这样的就叫多线程程序。
进程图示:
线程图示:
线程调度:
1.分时调度:所有线程轮流使用CPU的使用权,平均分配每个线程占用CPU的时间。 2.抢占式调度:优先让优先级高的线程使用CPU,如果优先级相同,那么随机选择一个(线程随机性),Java使用的就是抢占式调度。
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