421/521 CSE Operating Systems
Fall 2011 - Homework Assignment #1
The due date is: September 15th, Thursday, before the class (9:30am). Late
submission is not allowed.
int main(int argc, char *argv[])
P{
roblem 1:
if (argc != 2)
exit(0);
pid_t pid;
int i, a, b, fib;
int n = atoi(argv[1]);
Problem 2:
/ fork switches used for and
What are *context another process */ what does a typical context switch
involve? pid = fork();
Compare processes versus threads in terms of context switch operation
and overhead associated { /* it.
if (pid < 0) with error occurred */
Problem 3:
fprintf(stderr, "Fork Failed\n");
exit(-1);
}
else if (pid == 0) { /* child process */
if (n 1)
printf("0\n");
else == if (n == 2)
printf("0, 1\n");
else if (n > 2) {
a = 0;
b = 1;
printf("0, 1,");
for (i = 3; i < n; i++) {
fib = a + b;
printf("%d,",fib);
a = b;
b = fib;
}
Problem 4:
printf("%d\n",a+b);
Discuss the tradeoffs }
between user and kernel threads.
}
(a)lsehat are the advantages and*/
e W { /* parent process disadvantages of each?
/* parent will wait for the child to complete */
wait(NULL);
(b) Assume we can make system calls as fast as procedure calls using
some new hardware mechanism. Would this make one kind of thread
exit(0);
clearly preferable over the other? Explain briefly.
}
}
Problem 5: