int main(int argc, char** argv){
int pid;
int parent_pid = getpid();
int pages_count;
printf(1,"enableSwapping\n");
enableSwapping();
pid = fork();
if(pid == 0){
sleep(300);
pages_count = num_of_pages(parent_pid);
printf(1,"parent nummber of pages while swaping enabled: %d\n",pages_count);
printf(1,"child %d do ls- we expect to see %d.swap (parent_pid)\n",getpid(),parent_pid);
exec("ls",argv);
}
printf(1,"parent is wating and will be swaped out\n");
while (wait() != -1){} //main thread should not cross that line (program never finishes)
////////////////////////part 2 after disabling
printf(1,"disbleSwapping\n");
disableSwapping();
pid = fork();
if(pid == 0){
sleep(800);
pages_count = num_of_pages(parent_pid);
printf(1,"parent nummber of pages while swaping disabled: %d\n",pages_count);
printf(1,"child %d do ls- we expect NOT to see %d.swap (the parent_pid.swap)\n",getpid(),parent_pid);
exec("ls",argv);
}
printf(1,"parent is wating and will not be swaped out\n");
while (wait() != -1){} //main thread should not cross that line (program never finishes)
exit();
return 1;
}
int main(int argc,char** argv)
{
int pid;
printf(1,"\n**************** PART 1 *****************\n\n");
printf(1,"Enabling swapping now...\n");
enableSwapping();
if((pid = fork())==0)
{
pid = getpid();
printf(1,"Child process Pid = %d has %d memory pages allocated, going to sleep and will be swapped out\n",pid,getAllocatedPages(pid));
sleep2();
printf(1,"Child process pid = %d has woken up and was swapped in - has %d memory pages allocated.\n",pid,getAllocatedPages(pid));
exit();
}
else
{
int j,k;
for(j=0;j<10000000;j++)
{
k = j;
j = j+1;
j = k;
}
if(fork()==0)
{
printf(1,"we will now run the 'ls' command and see that the %d.swap file is created\n",pid);
exec("ls",argv);
}
else
{
for(j=0;j<10000000;j++)
{
k = j;
j = j+1;
j = k;
}
printf(1,"\nChild process Pid = %d is sleeping and swapped out - has %d memory pages allocated.\n",pid,getAllocatedPages(pid));
wakeup2();
while(wait()>0);
printf(1,"\n\n**************** PART 2 *****************\n\n");
printf(1,"Disabling swapping now...\n");
disableSwapping();
if((pid = fork())==0)
{
pid = getpid();
printf(1,"Child process Pid = %d has %d memory pages allocated, going to sleep and WILL NOT be swapped out\n",pid,getAllocatedPages(pid));
sleep2();
printf(1,"Child process pid = %d has woken up and was swapped in - has %d memory pages allocated.\n",pid,getAllocatedPages(pid));
exit();
}
else
{
if(fork()==0)
{
printf(1,"we will now run the 'ls' command and see that the %d.swap file has not been created\n",pid);
exec("ls",argv);
}
else
{
sleep(100);
printf(1,"\nChild process Pid = %d is sleeping and NOT swapped out - has %d memory pages allocated.\n",pid,getAllocatedPages(pid));
wakeup2();
}
}
}
}
while(wait()>0);
exit();
}
