4. Program A and Program B, below, are running at the same time. Each is three instructions long, and each instruction happens one time in the appropriate order for that program; however, the programs might be interleaved, Le. swap back and forth between the next A instruction and the next B instruction. Initially, the value of Carole's balance in the database is 300. Show a way to interleave the two programs so that each program executes its three instructions once each, in the correct order, but in the end Carole's balance is 425. Program A Program B A1 Ask database for Carole's balance and save it in 81 Ask database for Carole's balance and save it in y A2=-=+125 A3 Tell database to set Carole's balance to z 82y-y+75 83 Tell database to set Carole's balance to g
4. Program A and Program B, below, are running at the same time. Each is three instructions long, and each instruction happens one time in the appropriate order for that program; however, the programs might be interleaved, Le. swap back and forth between the next A instruction and the next B instruction. Initially, the value of Carole's balance in the database is 300. Show a way to interleave the two programs so that each program executes its three instructions once each, in the correct order, but in the end Carole's balance is 425. Program A Program B A1 Ask database for Carole's balance and save it in 81 Ask database for Carole's balance and save it in y A2=-=+125 A3 Tell database to set Carole's balance to z 82y-y+75 83 Tell database to set Carole's balance to g
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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Transcribed Image Text:4. Program A and Program B, below, are running at the same time. Each is three instructions long, and each instruction happens one time in the appropriate order for
that program; however, the programs might be interleaved, Le. swap back and forth between the next A instruction and the next B instruction.
Initially, the value of Carole's balance in the database is 300. Show a way to interleave the two programs so that each program executes its three instructions once
each, in the correct order, but in the end Carole's balance is 425.
Program A
Program B
A1 Ask database for Carole's balance and save it in a 81 Ask database for Carole's balance and save it in y
A2=-=+125
A3 Tell database to set Carole's balance to z
82y-y+75
83 Tell database to set Carole's balance to y
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