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The program follows to use a shared binary semaphore T.   Process A   int Y;             A1: Y = X*2;       A2: X = Y;         signal(T);           Process B int Z; B1: wait(T); B2: Z = X+1; X = Z; T is set to 0 before either process begins execution and, as before, X is set to 5. Now, how many different values of X are possible after both processes finish executing? a) one b) two c) three d) four

The program follows to use a shared binary semaphore T.   Process A   int Y;             A1: Y = X*2;       A2: X = Y;         signal(T);           Process B int Z; B1: wait(T); B2: Z = X+1; X = Z; T is set to 0 before either process begins execution and, as before, X is set to 5. Now, how many different values of X are possible after both processes finish executing? a) one b) two c) three d) four

Database System Concepts
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
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The program follows to use a shared binary semaphore T.

 

Process A  

int Y;            

A1: Y = X*2;      

A2: X = Y;        

signal(T);        

 

Process B

int Z;

B1: wait(T);

B2: Z = X+1;

X = Z;

T is set to 0 before either process begins execution and, as before, X is set to 5.

Now, how many different values of X are possible after both processes finish executing?

a) one

b) two

c) three

d) four

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