Question

(Operating Systems Question) During the life time of a process, it operates in one of the two modes, user mode and supervisor mode. For the following segment of a high-level language program, briefly describe what happens during its execution, as far as interrupt, trap and execution mode are concerned.

Int i,j;

…

i = i + 1;

WriteToScreen(i);

ReadFromKeyboard(j);

i = j+1;

Answer 1

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ANSWER:

EXPLANATION:

As per the question given solution below please let me know if you have any doubts

The two modes in which process operates are user mode and supervisor mode. Supervisor mode is unrestricted mode sometimes also termed as kernel mode whereas User mode is restricted mode.

In user mode memory access is limited and access of peripherals is also restricted so when readfromKeyboard is called an interrupt occurs.

In supervisor it can access peripherals,but if syscal occurs it will be a trap like in the given question.

1.UserMode

2.Supervisor mode (trap)

3.UserMode (interrupt)

hope it helps you

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