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astraxan [27]
3 years ago
13

8.7 lesson practice question 1

Computers and Technology
1 answer:
alexandr402 [8]3 years ago
5 0

Answer:

parallel

Explanation:

i got 100 its the same as question 3 on there

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#include #include int main( ) { int value = 10; int pid; value += 5; pid = fork( ); if (pid > 0 ) { value += 20; } printf(val
ss7ja [257]

Explanation:

To understand how this program is working let us print the variable value at different stages of the program so that we can understand how it is working.

Intitally, value=10 when it was declared.

Then we added 5 and it become value=15

then we used fork() function which creates a parent(orignal) and child(duplicate)

When fork() succeeds it returns the child pid to parent and returns 0 to the child. As you can see (pid > 0) condition is always true therefore the parent pid value becomes 35 ( 15+20) and the child pid value becomes 0.

#include <stdio.h>

#include <unistd.h>

int main( ) {

   int value = 10;

     printf("%d\n",value);

   int pid;

   value += 5;

     printf("%d\n",value);

   pid = fork( );

     printf("%d\n",pid);

   if (pid > 0 )

   {

       value += 20;

   }

   printf("%d\n",value);

   return 0;

}

Output:

10 (initial value)

15 (modified value)

5343 (pid when fork is used)

35 (final modified value)

0 (child value)

15 (the parent value when fork was used)

8 0
3 years ago
Write a parent program to fork(2) n processes where n is passed tothe program on the command line, and n can be from 1 to 10. Al
MrRissso [65]

Answer:

Complete code is given below:

Explanation:

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>

#include <time.h>

#include <sys/wait.h>

int main(int argc , char *argv[]){

pid_t mypid, childpid;

int status;

int i,n;

time_t t;

     

mypid = getpid();

printf("pid is %d.\n", mypid);

childpid = fork();

if ( childpid == -1 ) {

perror("Cannot proceed. fork() error");

return 1;

}

 

 

if (childpid == 0) {

 

 

mypid = getpid();

 

 

childpid = fork();

if ( childpid == -1 ) {

perror("Cannot proceed. fork() error");

return 1;

}

 

if (childpid == 0) {

 

mypid = getpid();

printf("Child pid is %d.\n", getppid());

 

childpid = fork();

 

 

if ( childpid == -1 ) {

perror("Cannot proceed. fork() error");

return 1;

}

random((unsigned) time(&t));

printf(" parent id = %d : Random = %d\n",mypid , (int)(random()% 100 +1));

printf("child id = %d : Random = %d\n",getpid , (int)(random()% 100 +1));

 

if (childpid == 0) {

 

printf("Child 2: I hinerited my parent's PID as %d.\n", mypid);

 

mypid = getpid();

printf("Child 2: getppid() tells my parent is %d. My own pid instead is %d.\n", getppid(), mypid);

 

sleep(30);

return 12;

} else return 15;

} else {

 

while ( waitpid(childpid, &status,0) == 0 ) sleep(1);

 

if ( WIFEXITED(status) ) printf("Child 1 exited with exit status %d.\n", WEXITSTATUS(status));

else printf("Child 1: child has not terminated correctly.\n");

}

} else {

printf(" fork() is ok and child pid is %d\n", childpid);

wait(&status);

 

if ( WIFEXITED(status) ) printf(" child has exited with status %d.\n", WEXITSTATUS(status));

else printf(" child has not terminated normally.\n");

}

 

return 0;

}

Output:

pid is 24503.

Child   pid  is 24565.

parent id = 24566 : Random = 87

child id = 1849900480 : Random = 78

pid is 24503.

Child 1  exited with exit status 15.

pid is 24503.

fork() is ok and child pid is  24565

child has exited with status 0.

6 0
3 years ago
Read the excerpt from Act 111, scene iii of Romeo and Juliet. Which is the best paraphrase of this dialogue
Rufina [12.5K]
I think that D is the answer
8 0
3 years ago
I need help with humans need not apply for codeing
vampirchik [111]

Answer:

huge\color{blue}\boxed{The}\huge\color{pink}\boxed{Points

3 0
2 years ago
Read 2 more answers
Which of the following is the largest unit of information?
Mila [183]
What are the choices?

5 0
3 years ago
Read 2 more answers
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