single thread

基本解释

It's easy to see what to do with a single thread: exit when the user says to quit.
对于单线程程序来说，我们很容易知道是如何终止的：当用户退出时程序就退出了。
But a task can be larger than the time/size one would want to spend inside a single thread context.
但是，任务花费的时间／大小可能比我们希望在单独线程上下文中使用的要多／大。
Even when a program contains only a single thread running on a single processor, a synchronized method call is still slower than an unsynchronized method call.
即使一个程序只包括一个在单一处理器上运行的单线程，一个同步的方法调用仍要比非同步的方法调用慢。

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