2.10 Consider the following program: int x = 0, y = 0; co x = x + 1; x = x + 2; // x = x + 2; y = y X; ос (a) Suppose each assignment statement is implemented by a single machine instruction and hence is atomic. How many possible histories are there? What are the possible final values of x and y? (b) Suppose each assignment statement is implemented by three atomic actions that load a register, add or subtract a value from that register, then store the result. How many possible histories are there now? What are the possible final values of x and y?

2.10 Consider the following program: int x = 0, y = 0; co x = x + 1; x = x + 2; // x = x + 2; y = y X; ос (a) Suppose each assignment statement is implemented by a single machine instruction and hence is atomic. How many possible histories are there? What are the possible final values of x and y? (b) Suppose each assignment statement is implemented by three atomic actions that load a register, add or subtract a value from that register, then store the result. How many possible histories are there now? What are the possible final values of x and y?

Name: 2.10 Consider the following program:int x = 0, y = 0;co x = x + 1; x
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Description: 2.10 Consider the following program:int x = 0, y = 0;co x = x + 1; x = x + 2;// x = x + 2; y = y = x;ос(a) Suppose each assignment statement is implemented by a single machineinstruction and hence is atomic. How many possible histories are there? Wh

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

2.10 Consider the following program:
int x = 0, y = 0;
co x = x + 1; x = x + 2;
// x = x + 2; y = y = x;
ос
(a) Suppose each assignment statement is implemented by a single machine
instruction and hence is atomic. How many possible histories are there? What
are the possible final values of x and y?
(b) Suppose each assignment statement is implemented by three atomic actions
that load a register, add or subtract a value from that register, then store the result.
How many possible histories are there now? What are the possible final values of
x and y?

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