1
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
A
flag[j]=true and turn=i
B
flag[j]=true and turn=j
C
flag[i]=true and turn=j
D
flag[i]=true and turn=i
2
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?
A
1
B
2
C
3
D
None of the above
3
GATE CSE 1996
Subjective
+2
-0
The concurrent programming constructs fork and join are as below: Fork (label) which creates a new process executing from the specified label join (variable) which decrements the specified synchronization variable (by 1) and terminates the process if the new value is not 0. Show the precedence graph for S1, S2, S3, S4 and S5 of the concurrent program below.
N = 2
M = 2
fork L3
fork L4
S1
L1 : join N
S3
L2: join M
S5
L3:S2
goto L1
L4:S4
goto L2
next:
4
GATE CSE 1996
MCQ (Single Correct Answer)
+2
-0.6
A solution to the Dining Philosophers Problem which avoids deadlock is
A
ensure that all philosophers pick up the left fork before the right fork.
B
ensure that all philosophers pick up the right fork before the left fork
C
ensure that one particular philosopher picks up the left fork before the right fork, and that all other philosophers pick up the right fork before the left fork
D
None of the above.
GATE CSE Subjects
Software Engineering
Web Technologies
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12