1
GATE CSE 2003
MCQ (Single Correct Answer)
+2
-0.6
Suppose we want to synchronize two concurrent processes P and Q using binary semaphores S and T. The code for the processes P and Q is shown below.
Process P:
Process Q:
Process P:
while(1){
W:
Print '0';
Print '0';
X:
}
Process Q:
while(1){
Y:
Print '1';
Print '1';
Z:
}
Synchronization statements can be inserted only at points W, X, Y, and Z.Which of the following will ensure that the output string never contains a substring of the form 01n0 or 10n1 where n is odd?
2
GATE CSE 2003
MCQ (Single Correct Answer)
+2
-0.6
Suppose we want to synchronize two concurrent processes P and Q using binary semaphores S and T. The code for the processes P and Q is shown below.
Process P:
Process Q:
Process P:
while(1){
W:
Print '0';
Print '0';
X:
}
Process Q:
while(1){
Y:
Print '1';
Print '1';
Z:
}
Synchronization statements can be inserted only at points W, X, Y, and Z.Which of the following will always lead to an output starting with 001100110011
3
GATE CSE 2001
MCQ (Single Correct Answer)
+2
-0.6
Consider Peterson’s algorithm for mutual exclusion between two concurrent processes i and j. The program executed by process is shown below.
Repeat
flag[i]=true;
turn=j;
while (P) do no-op;
Enter critical section, perform actions, then
exit critical section
Flag[i]=false;
Perform other non-critical section actions.
Until false;
For the program to guarantee mutual exclusion, the predicate P in the while loop should be 4
GATE CSE 1997
MCQ (Single Correct Answer)
+2
-0.6
Each process Pi,i=1.....9 is coded as follows
Repeat
P(mutex){
critical section
}
V(mutex)
Forever
The code for P10 is identical except that it uses V(mutex) in place of P(mutex). What is the largest number of processes that can be inside the critical section at any moment? Questions Asked from Synchronization and Concurrency (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
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GATE CSE Subjects
Theory of Computation
Operating Systems
Algorithms
Database Management System
Data Structures
Computer Networks
Software Engineering
Compiler Design
Web Technologies
General Aptitude
Discrete Mathematics
Programming Languages