Computer Systems: A Programmer's Perspective Plus Mastering Engineering With Pearson Etext -- Access Card Package (3rd Edition)
Computer Systems: A Programmer's Perspective Plus Mastering Engineering With Pearson Etext -- Access Card Package (3rd Edition)
3rd Edition
ISBN: 9780134123837
Author: Randal E. Bryant, David R. O'Hallaron
Publisher: PEARSON
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Chapter 9, Problem 9.16HW
Program Plan Intro

Dynamic allocator:

Dynamic allocator keeps the heap as a group of several size blocks; each block is an attached portion of virtual memory which is allocated or free.

  • An allocated block has been clearly kept for use by the application.
  • A free block is offered to be allocated.

Two types of allocators:

  1. 1. Explicit allocators
  2. 2. Implicit allocators

Explicit allocators:

Explicit allocators need the application to explicitly free any allocated blocks.

Implicit allocators:

Implicit allocators is the method of automatically releasing vacant allocated blocks. This is also known as garbage collection.

Explicit free list:

In this method, a block contains one word header, payload and additional padding. The header encrypts the block size which contains header and padding; and also check the block is allocated or free.

  • The heap can be organized doubly linked list by including predecessor and successor pointer in each free block.
  • This method reduces the allocation time when compared to implicit free list.
  • If the arrangement is single-word, the block size is constantly a multiple of “4” and the low-order bits of the block size are always zero.
  • If the arrangement is double-word, the block size is constantly a multiple of “8” and the low-order bits of the block size are always zero.

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Programming Problems 9.28 Assume that a system has a 32-bit virtual address with a 4-KB page size. Write a C program that is passed a virtual address (in decimal) on the command line and have it output the page number and offset for the given address. As an example, your program would run as follows: ./addresses 19986 Your program would output: The address 19986 contains: page number = 4 offset = 3602 Writing this program will require using the appropriate data type to store 32 bits. We encourage you to use unsigned data types as well. Programming Projects Contiguous Memory Allocation In Section 9.2, we presented different algorithms for contiguous memory allo- cation. This project will involve managing a contiguous region of memory of size MAX where addresses may range from 0 ... MAX - 1. Your program must respond to four different requests: 1. Request for a contiguous block of memory 2. Release of a contiguous block of memory 3. Compact unused holes of memory into one single block 4.…
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