Hi! I am working on an exercise where i must count the time of a process. The problem is when using the getitimer. I searched google, read some staff and more over i understood what id does. My question is when exactly i should use it? To do what? I already used setitimer and signal. And i must count the times that every timer is zero. This number is how long the process worked. Can anyone help me? Thanks...
For example in this code why should i use getitimer?
Code:if(pid2 == 0){ /* 2o child */ child2_PID = getpid(); /* enable the child 2 signal handlers (disable parent handlers) */ signal(SIGALRM, sig_handler); // συναγερμός signal(SIGVTALRM, sig_handler); // λήξη εικονικού χρονιστή signal(SIGPROF, sig_handler); // λήξη χρονιστή προφίλ /* set the child 2 itimers */ setitimer(ITIMER_REAL, &c2_realt, NULL); // πραγματικός χρόνος πατέρα setitimer(ITIMER_VIRTUAL, &c2_virtt, NULL); // χρόνος που εκτελέστηκε η διεργασία setitimer(ITIMER_PROF, &c2_proft, NULL); // χρόνος που χρησιμοποιήσε η ο πυρήνας την CPU /* start yourfunction() at child1 */ res = (funarg); /* Read the child 1 itimer values and report them */ getitimer(ITIMER_PROF, &c2_realt); getitimer(ITIMER_REAL, &c2_virtt); getitimer(ITIMER_VIRTUAL, &c2_proft); printf("Child2, Real time: %ld sec\n", c2_realt_secs); printf("Child2, CPU time: %ld sec\n", c2_proft_secs); printf("Child2, User time: %ld sec\n", c2_virtt_secs); //printf("Kernel -> %ld sec\n", p_proft_secs-c1_virtt_secs); printf("\n"); fflush(stdout); exit(0); }else{
