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It creates a single-use, fixed-size queue in which empty locations are not reused Thus, the queue eventually becomes exhausted and must be discarded While such queues are quite limited, they are occasionally very useful For example, such a queue might hold a list of data produced by one process and consumed by another In this situation, neither the producer nor the consumer would want to reuse a queue When more data is generated, a new queue is created The previous queue is simply discarded and eventually garbage-collected Of course, much more sophisticated queues are possible Later in this book, you will see another way to implement a queue, called a circular queue, that reuses empty locations in the underlying array when elements are removed Thus, a circular queue can continue to have elements put in as long as elements are also being taken out.

4:

You will also see how to create a dynamic queue, which will automatically expand to hold more elements But for now, a simple queue will do..

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Thus, a final call to Pulse( ) is required in order for the waiting method to run As an experiment, try removing this call to Pulse( ) inside Tick( ) and watch what happens As you will see, the program will hang, and you will need to press ctrl-c to exit The reason for this is that when the final call to Tock( ) calls Wait( ), there is no corresponding call to Pulse( ) that lets Tock( ) conclude Thus, Tock( ) just sits there, waiting forever Before moving on, if you have any doubt that the calls to Wait( ) and Pulse( ) are actually needed to make the clock run right, substitute this version of TickTock into the preceding program It has all calls to Wait( ) and Pulse( ) removed..

C# defines one special class called object that is an implicit base class of all other classes and for all other types (including the value types). In other words, all other types are derived from object. This means that a reference variable of type object can refer to an object of any

3

Here, the local variables sum and count are both declared as static and initialized to 0. Remember, for static variables, the initialization occurs only once not each time the function is entered. The program uses r_avg( ) to compute and report the current average of the numbers entered by the user. Because both sum and count are static, they will maintain their values between calls, causing the program to work properly. To prove to yourself that the static modifier is necessary, try removing it and running the program. As you can see, the program no longer works correctly, because the running total is lost each time r_avg( ) returns.

static int k; void f1() { k = 99; // OK }

Selecting a Redundancy Solution The redundancy recommendations and requirements for the logon agent are identical to that of the web server. As with the web server, use Microsoft Network load balancing or a hardware load balancer. The logon agent is also completely stateless. When using multiple logon agents with a hardware load balancer, new users, as well as currently logged-on users, are unaffected if a logon agent fails.

Network Termination (NT) Equipment. Network Termination (NT) equipment handles communication between the ISDN exchange and the customer premises. NT equipment typically is the demarcation point ( demarc ) between the customer premises and the network administration. There are two types of NT equipment, NT1 and NT2. NT1 devices provide functions equivalent to the Physical layer (layer 1) of the OSI model. These functions include signal conversion, timing, maintenance of the physical transmission line, and the physical and electrical termination of the network at the user end. Sometimes the NT1 is built into another piece of equipment and therefore might not exist physically as a separate device. The functionality of the NT1 must be present in an ISDN network, however. NT2 devices are more intelligent than NT1 devices. NT2 devices perform Data Link layer (layer 2) as well as Network layer (layer 3) functions. Whenever the NT2 does not provide layer 3 capability, then the NT2 will pass the original layer 2 and layer 3 data received from NT1 to the Terminal Equipment. NT2 equipment provides local premises distribution functions, like controlling multiple BRIs feeding into a

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