If a function needs to maintain the state of some data over successive calls, such as a working buffer or a pointer, the caller should provide this data.
如果函数需要在一系列调用期间维持某些数据的状态，比如工作缓存或指针，那么调用者应该提供此数据。
Working in conjunction with our stack, we'll have a pointer that identifies our current position in the stack.
与堆栈在一起的还有一个指针，指示我们在堆栈中的当前位置。
Messages on the Hold Queues may be a pointer that some of the runtime components of Process Server are not available or are not working correctly.
保留队列上的消息可以作为Process Server的某些运行时组件不可用或无法正常工作的指示器。
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