Given the following pseudo-code, please show what the outputs will be at LINE A, B, C...
Given the following pseudo-code, please show what the outputs will be at LINE A, B, C and D. please put down “inconclusive” if you think the CPU process scheduling could potentially result in multiple values for integer i. You will receive partial credit if you draw the process tree.
int i = 0;
int main(){
if (fork() == 0) {
i++;
if (fork() == 0){
if (fork() == 0){
i++;
print value of i; /*Line A*/
} else {
wait for this process’s child processes to stop;
i++;
print value of i; /*Line B*/
}
} else {
print value of i; /* LINE C*/
wait for this process’s child processes to stop; }
} else {
wait for this process’s child processes to stop;
print value of i; /* LINE D*/
}
}
Homework Answers
--> At Line A, value printed is 2. (because 2 increments will be performed from i = 0)
--> At Line B, value printed is 2. (because 2 increments will be performed from i = 0)
--> At Line C, value printed is 1. (because only 1 increment will be performed from i = 0)
--> At Line D, value printed is 0. (because no increments will be performed from i = 0)
Add Answer to:
Given the following pseudo-code, please show what the
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#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
// Function ptototypes
int readX();
void writeX(int);
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Source code to modify: #include <stdio.h> #include <unistd.h> #include <sys/types.h> int main() { pid_t pid; /*fork...
Source code to modify:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
pid_t pid;
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pid = fork();
if (pid<0){ /*error occured*/
fprintf(stderr,"Fork failed\n");
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GIVEN CODE- FILL IN THE
BLANK!
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
// Function ptototypes
int readX();
void writeX(int);
int main() /// chi read x ---> divi ---> write x into file
---> par read x --> sub--> write x into file---> chi
read x-->etc
{
int pid;
// pid: used to keep track of the child
process
int x = 19530; // x:
our value as integer
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a) The purpose of the code on line 19, i.e., what does this line
of code accomplish?
b) The purpose of the code on lines 21-27 (if statement). Make
sure to explain each possibility handled by the if.
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Source code to modify:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main()
{
pid_t pid;
/*fork a child process*/
pid = fork();
if (pid<0){ /*error occured*/
fprintf(stderr,"Fork failed\n");
return 1;
}
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}
else { /*parent process */
/*parent will wait for the child to complete*/
printf("I am the parent %d\n",pid);
wait(NULL);
printf("Child Complete\n");
}
return 0;
}
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