Question 1: The following program consists of 3 concurrent processes and 3 binary semaphores. The semaphores are initialized as SO = 1, S1 = 0, S2 = 0. Process PO Process P1 Process P2 while(true) { wait(SO); print '0'; signal(S1); signal(S2); } wait(S1); signal(SO); wait(S2); signal(S0); What is the maximum number of times that PO can print "0"?

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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Question 1:The following program consists of 3 concurrent processes and 3 binary
semaphores. The semaphores are initialized as SO = 1, S1 = 0, S2 = 0.
Process PO
Process P1
Process P2
PO
P1
What is the maximum number of times that PO can print "0"?
Question 2: Consider the following snapshot of a system:
Process
Allocation
Max
P2
P3
while(true)
{
wait(S0);
print '0';
signal(S1);
signal(S2);
P4
A
3 0
0
1
B
0
1
2
0 0
C
2
0
0
1
D
1
1
0
2
1
A
4
3
w
1
wait(S1);
signal(SO);
0 2
1
A. Calculate the Need matrix
B
00
2
2421000
1
CDA BCD
2
1
1
0 2
2
wait(S2);
signal(SO);
0
2
Available
1
B. Illustrate that the system is in safe state by demonstrating an order(sequence) in which
the processes may complete.
C. If P4 request arrives for (1, 0, 2, 0), can the request be granted immediately?
Transcribed Image Text:Question 1:The following program consists of 3 concurrent processes and 3 binary semaphores. The semaphores are initialized as SO = 1, S1 = 0, S2 = 0. Process PO Process P1 Process P2 PO P1 What is the maximum number of times that PO can print "0"? Question 2: Consider the following snapshot of a system: Process Allocation Max P2 P3 while(true) { wait(S0); print '0'; signal(S1); signal(S2); P4 A 3 0 0 1 B 0 1 2 0 0 C 2 0 0 1 D 1 1 0 2 1 A 4 3 w 1 wait(S1); signal(SO); 0 2 1 A. Calculate the Need matrix B 00 2 2421000 1 CDA BCD 2 1 1 0 2 2 wait(S2); signal(SO); 0 2 Available 1 B. Illustrate that the system is in safe state by demonstrating an order(sequence) in which the processes may complete. C. If P4 request arrives for (1, 0, 2, 0), can the request be granted immediately?
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