This is generally done by selecting one process for execution and letting it run for a short period (called a timeslice), or until it needs to wait for some event, such as IO to complete.
通常的做法是，选择一个要执行的进程，并让它在短时间内运行(这个时间称为时间片)，或者一直运行到它需要等待的一些事件，如要完成的IO等。
Tomcat uses NIO (Non-blocking IO) to keep the connection alive without wasting the waiting threads.
Tomcat使用NIO（无阻塞IO）来保持连接活动，无需浪费等待中的线程。
Tomcat uses NIO (Non-blocking IO) to keep the connection alive without wasting the waiting threads.
Tomcat使用NIO（无阻塞IO）来保持连接活动，无需浪费等待中的线程。
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