________ system call creates new process in Unix.
fork
fork() creates a child process. On success, it returns 0 in the child and the child’s process ID in the parent, allowing the two processes to follow different execution paths.
Important Questions from Process
- _________ and _________ are used in conjunction for making a complete process subroutine.
A computer system has 7 tape drives. There are ‘n’ processes competing for them. Each process may need 2 tape drives. What is the maximum value of ‘n’ for which the system is guaranteed to be deadlock free?
Assuming that the system call fork () never fails, consider the following C programs P1 and P2 executed on a UNIX / Linux system:
/*P1*/
Int main() {
fork ():
fork () ;
fork () ;
Printf(“Happy\n”);
}
/*P2*/
Int main() {
fork ();
Printf(“Happy\n”);
fork ()
Printf(“Happy\n”);
fork () ;
Printf(“Happy\n”);
}
Statement I: P1 displays "Happy" 8 times.
Statement II: P2 displays "Happy" 12 times.
In the light of the above statements, choose the correct answer from the options given below
Match List I with List II
List I
List II
System calls
Description
A.
fork()
I.
Sends a signal from one process to another process
B.
exec()
II.
Indicates termination of the current process
C.
kill()
III.
Loads the specified program in the memory
D.
exit()
IV.
Creates a child process
Choose the correct answer from the options given below :
Identify the circumstances under which pre-emptive CPU scheduling is used:
(a) A process switches from Running state to Ready state
(b) A process switches from Waiting state to Ready state
(c) A process completes its execution
(d) A process switches from Ready to Waiting state
Choose the correct option:
