Question

In: Computer Science

Describe the items shared by all threads in a process. What are the items which are...

  1. Describe the items shared by all threads in a process. What are the items which are private to each thread.

  2. On all current computers, at least part of the interrupt handlers are written in assembly language. Why?

Solutions

Expert Solution

ANS 1)

The items that are shared by all threads in a process are:-

  1. Global Variables:- Since they are of the same process, they all share the global variables.
  2. Heap:- Since global variables are stored in heap, the heap is shared among threads.
  3. Address Space:- A process has an address space that has program text and data and other resources as well. these include Child Processes, Open Files, Pending Alarms, Signal Handlers, and more.

Items that are private to each thread are:-

  1. Program Counter
  2. Registers
  3. Stack
  4. State

ANS 2)

When the interrupts start, they save the registers in the process table entry for the current ongoing process. The information pushed onto the stack by the interrupt is then removed and the stack pointer is then set to point at a temporary stack which is being used by the process handler. These actions like saving registers, setting the stack pointer can't be written/expressed in HLL such as C++,C, Java, so these are performed by assembly-language routine which is usually the same for all interrupts as the work of saving registers is identical.

venereology answered 6 months ago
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