1. Protecting a two-register interface. Explain how a malicious thread can tie up a network using a two-register interface indefinitely.Write a small code fragment illustrating the problem. Suggest a...

1. Protecting a two-register interface. Explain how a malicious thread can tie up a network using a two-register interface indefinitely.Write a small code fragment illustrating the problem. Suggest a method to prevent this problem from occurring.

2. Long messages with register-mapped interface. Suppose you have a processor that has 64 general purpose registers and a register-mapped interface as described in Section 20.1.2 and you need to send a 1,024-word message from a buffer in memory. Write a short code fragment that performs this message send. Suggest a way to reduce the overhead of sending long messages.