Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Chapter 9.9, Problem 9.7PP
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. Explicit allocators
- 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.
Implicit 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 check the block is allocated or free.
- 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.
- Thus, essential to store only the high-order “29 bits” of the block size, freeing the remaining “3 bits” to encrypt other information.
- Here, smallest significant bits is using to represent the block is allocated or free.
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Problem Statement: Consider an input string TAM of letters ‘A’, ‘M’, and ‘T’. This string, which is given by the user, ends with ‘#’. It should be stored in a table (or array), called TAMUK. The number of each of these letters is unknown. We have a function, called SWAP(TAM,i,j), which places the ith letter in the jth entry of string TAM and the jth letter in the ith entry of TAM. Note that SWAP(TAM,i,j) is defined for all integers i and j between 0 and length(TAM)–1, wherelength(TAM) is the number of letters of TAM.
Using our algorithmic language, write an algorithm, called Sort_TAM, which sorts the letters in the array TAMUK in a way that all T’s appear first, followed by all A’s, and followed by all M’s. The algorithm Sort_TAM should have one parameter: The array TAMUK. Also, your solution is correct only if the following four constraints are satisfied:
- Constraint 1: Each letter (‘A’, ‘M’, or ‘T’) is evaluated only once.
- Constraint 2: The function SWAP(TAM,i,j) is used…
Problem Statement: Consider an input string TAM of letters ‘A’, ‘M’, and ‘T’. This string, which is given by the user, ends with ‘#’. It should be stored in a table (or array), called TAMUK. The number of each of these letters is unknown. We have a function, called SWAP(TAM,i,j), which places the ith letter in the jth entry of string TAM and the jth letter in the ith entry of TAM. Note that SWAP(TAM,i,j) is defined for all integers i and j between 0 and length(TAM)–1, where length(TAM) is the number of letters of TAM.
1. Using our algorithmic language, write an algorithm, called Sort_TAM, which sorts the letters in the array TAMUK in a way that all T’s appear first, followed by all A’s, and followed by all M’s. The algorithm Sort_TAM should have one parameter: The array TAMUK. Also, your solution is correct only if the following four constraints are satisfied:
- Constraint 1: Each letter (‘A’, ‘M’, or ‘T’) is evaluated only once.
- Constraint 2: The function SWAP(TAM,i,j) is used only…
Chapter 9 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 9.2 - Prob. 9.1PPCh. 9.3 - Prob. 9.2PPCh. 9.6 - Prob. 9.3PPCh. 9.6 - Prob. 9.4PPCh. 9.8 - Practice Problem 9.5 (solution page 882) Write a C...Ch. 9.9 - Prob. 9.6PPCh. 9.9 - Prob. 9.7PPCh. 9.9 - Prob. 9.8PPCh. 9.9 - Prob. 9.9PPCh. 9.9 - Prob. 9.10PP
Ch. 9 - Prob. 9.11HWCh. 9 - Repeat Problem 9.11 for the following address....Ch. 9 - Repeat Problem 9.11 for the following address....Ch. 9 - Given an input file hello.txt that consists of the...Ch. 9 - Determine the block sizes and header values that...Ch. 9 - Prob. 9.16HWCh. 9 - Prob. 9.17HWCh. 9 - Prob. 9.18HWCh. 9 - Prob. 9.19HWCh. 9 - Write your own version of malloc and free, and...
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