性能计数器指示操作系统、应用程序或者服务执行得有多好。
Performance counters indicate how well the operating system, an application or service is performing.
完成此任务后，对全局计数器进行递减操作（该计数器对活动事件处理程序实例进行计数）。
Once that’s done, decrement the global counter that counts the number of active event handler instances.
作为延迟装置的计数器，延迟时间内允许执行一个程序以外的操作。
A counter for inserting a deliberate time delay allowing an operation external to the program to occur.
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