Question: operating systems 2. What is the main difficulty that a programmer must overcome in writing an operating system for a real-time environment? 3. Which of

operating systems operating systems 2. What is the main difficulty that a programmer must

2. What is the main difficulty that a programmer must overcome in writing an operating system for a real-time environment? 3. Which of the following instructions should be privileged? a. Set value of timer. b. Read the clock. c. Clear memory d. Issue a trap instruction. e. Turn off interrupts. f. Modify entries in device-status table. g. Switch from user to kernel mode. h. Access I/O device

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