Under what circumstances is a FIFO necessary in an I/O environment?
What will be an ideal response?
The previous question explains that double?buffering is necessary when two inputs arrive so close together that the first input is not read before the second arrives. In the general case, where a burst of data may be received, it is necessary to buffer the data before it is processed. A FIFO (first?in?first?out) queue is necessary. This can be implemented in hardware or software and is essentially a memory that queues incoming data. FIFOs are necessary when the data rate being received is not constant and is bursty; that is, groups of input values arrive in a short interval. Such a circumstance might occur with communication networks or data from a device such as a disk drive.
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What is the output of this code segment?
``` for (k = 5; k > 0; k = k - 1) { for (i = 1; i <= 5 - k; i = i + 1) printf("."); for (j = 1; j <= 2 * k - 1; j = j + 1) printf("B"); printf("\n"); } ```
Sending a message to a variable before the corresponding object has been instantiated causes a(n) ____ exception.
A. no such method B. syntax C. desk checking D. null pointer
At periodic time intervals, ____ technology downloads updated, personalized information on your screen.
A. search engine B. push C. spider D. wizard
Which of the following devices is BEST suited for servers that need to store private keys?
A. Hardware security module B. Hardened network firewall C. Solid state disk drive D. Hardened host firewall