1) What do the below programs do? Comment on child and parent process. // program 1 int counter =1; int main() //program 2 int main() { privtf("p"); fflush(stdout); if (fork() == 0) { privtf("q"); fflush(stdout); } else { if (fork() != 0) { wait(NULL); counter--; printf("counter = %d\n", counter);} else { printf("r"); fflush(stdout); wait(NULL); } } counter+±; printf("counter = %d\n", counter);} } //program 3 int main() { int i; for (i= 0; i < 3; i++) { if (fork() == 0) { printf("Child sees i = %d\n", i); exit(0); } else { printf("Parent sees i = %d\n", i); wait(NULL); }

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
Question

c programming not c++

1) What do the below programs do? Comment on child and parent process.
// program 1
int counter =1;
int main()
{
if (fork() != 0) {
wait(NULL);
//program 2
int main()
{
privtf("p"); fflush(stdout);
if (fork() == 0) {
printf("q"); fflush(stdout):
}
else {
counter--;
printf("counter = %d\n", counter);}
}
else {
printf("r"); fflush(stdout);
wait(NULL);
counter+±;
printf("counter = %d\n", counter);}
}
}
//program 3
int main()
{
int i;
for (i= 0; i< 3; i++) {
if (fork() == 0) {
printf("Child sees i = %d\n", i);
exit(0);
} else {
printf("Parent sees i = %d\n", i);
wait(NULL);
}
Transcribed Image Text:1) What do the below programs do? Comment on child and parent process. // program 1 int counter =1; int main() { if (fork() != 0) { wait(NULL); //program 2 int main() { privtf("p"); fflush(stdout); if (fork() == 0) { printf("q"); fflush(stdout): } else { counter--; printf("counter = %d\n", counter);} } else { printf("r"); fflush(stdout); wait(NULL); counter+±; printf("counter = %d\n", counter);} } } //program 3 int main() { int i; for (i= 0; i< 3; i++) { if (fork() == 0) { printf("Child sees i = %d\n", i); exit(0); } else { printf("Parent sees i = %d\n", i); wait(NULL); }
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