Homework Answers
1) Number of child processes created = 2
n
- 1 .
And total number of processes created is = Number of child processes + 1.
Explanation : -
On first call there will be one child process created by first fork.
On second call, there will be 2 child processes created by second fork.
On third call, there will be 4 child processes created by third fork
and so on.
So in total 24 = 16 processes are called.
2)Output will be :-
CHILD: 0 CHILD: -1 CHILD: -4 CHILD: -9 CHILD: -16
PARENT: 0 PARENT: 1 PARENT: 2 PARENT: 3 PARENT: 4
Explanation:-
When the fork() is called, it duplicates the process, so after calling fork there
are actually 2 instances of the program running.
To know which process is parent one and which is child process is:
in the parent process, the PID of the child process will return positive integer from the call of fork().
That's why the if (pid> 0 ) { /* PARENT */ } code works. In the child process, fork() just returns 0.
Add Answer to:
M ALL ELEG220 LABS jamalbaraka X Race Condition in operating syst X o Mail- Jamal A...
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;
/*fork a child process*/
pid = fork();
if (pid<0){ /*error occured*/
fprintf(stderr,"Fork failed\n");
return 1;
}
else if (pid == 0) { /*child process */
printf("I am the child %d\n",pid);
execlp("/bin/ls","ls",NULL);
}
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;
}
1. Write program codes for 3.21 a and...
Operating Systems Questions (Please help if you can) 1. A computer has cache, main memory, and...
Operating Systems Questions (Please help if you can) 1. A computer has cache, main memory, and a disk used for virtual memory. If a referenced word is in the cache, 20ns are required to access it. If it is in main memory but not in the cache, 60ns are required to load it into the cache (this includes the time to originally check the cache), and then, the reference is started again. If the word is not in main memory,...
GIVEN CODE- FILL IN THE BLANK! #include <fcntl.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <string.h>...
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
...
I have the following code....from the previous lab....the above needs to be added to what is...
I have the following code....from the previous lab....the above
needs to be added to what is already existing. ALSO MODIFY
SEMAPHORES TO USE pthreads instead of the pipe constructs P() &
V()
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <sys/stat.h>
void printStat(char *filename);
//Main
int main(int argc, char *argv[])
{
//Process Id (storing)
pid_t pid;
int j;
//printf("Welcome to Project Three\n”);
// For loop*/
for (j = 1; j...
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;
}
else if (pid == 0) { /*child process */
printf("I am the child %d\n",pid);
execlp("/bin/ls","ls",NULL);
}
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;
}
1. Write program codes for 3.21 a and...
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
...
I have the following code....from the previous lab....the above
needs to be added to what is already existing. ALSO MODIFY
SEMAPHORES TO USE pthreads instead of the pipe constructs P() &
V()
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <sys/stat.h>
void printStat(char *filename);
//Main
int main(int argc, char *argv[])
{
//Process Id (storing)
pid_t pid;
int j;
//printf("Welcome to Project Three\n”);
// For loop*/
for (j = 1; j...
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