Acpu with interrupt driven i/o is busy servicing a disk request. while the cpu is midway through the disk-service routine, another i/o interrupt occurs.
a. what happens next?
b. is it a problem?
c. if not, why not? if so, what can be done about it?

When a CPU is working with interrupt driven I/O scheme, it will control the I/O interrupt on the basis of priority. This means that interrupts with higher priority will be processed first and others will be processed later.

When the CPU is busy servicing a disk request and another I/O interrupt occurs, the CPU will check the priority line (assigned during design phase) of both the interrupts and then decides the precedence from both of them.  

When the CPU gets ready to process the interrupt, an Interrupt Acknowledge signal (INTA) is sent back in return to interrupt signal (INT).

Occurring of interrupts while the CPU is midway through the disk-service is not a problem. It can happen normally.

Occurring of interrupts while the CPU is midway through the disk-service is not a problem, the CPU just picks the multiple interrupts checks the priority line and processes one of the multiple interrupts based on the highest priority matter.

i hope it will help you!

a variable of array type holds a reference of object

array are commonly used in computer program to organize data so that a related set of values

array are using zero base indexing it start with 0.

all component of array have same type, two different types doesn't use in single array

if array are store 10 quantities its index value varies from 0 to 9.

it stores 1st quantity value in index value 0 and this process will same till index value 9.

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