multiplication. Initialize the semaphore with the initial value. Process 1: Process 2: tl =a+ b; 14 = t1*t2; 12 =c+ d; 13 = c/f;
multiplication. Initialize the semaphore with the initial value. Process 1: Process 2: tl =a+ b; 14 = t1*t2; 12 =c+ d; 13 = c/f;
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:Two processes are concurrently evaluating the expression (a + b) (c + d) - (e/f). Insert wait(S) and signal(S) operations into the code to enforce correct execution. The semaphore S, must guarantee that the additions must be completed before being used in
the multiplication. Initialize the semaphore with the initial value.
Process 1:
tl = a + b;
Process 2:
t2 =c + d;
t4 = t1*t2;
t5 = t4 - t3;
t3 = e/f;
The positions of instructions are given as line numbers. Copy and paste wait(S) in the position where you would insert the wait operation. Copy and paste signal(S) in the position number where you would insert the signal operation. (Note: exact matching
needed, hence type correctly or copy and paste). Enter NA if nothing to insert (Do not leave it blank).
Process 1:
1.
P1-
2. t1 - a + b:
3.
P3-
4. t4 - t1*t2:
5.
P5-
6. t5 - t4 - t3;
7.
P7=
Process 2:
1.
P21-
2. 12 -c+ d;
3.
P23-
4. t3 - e/f;
5.
P25-
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