#include <sched.h>
#include <unistd.h>
#include <stdio.h>
#include <assert.h>

#define NUM_THREAD	10
int pids[NUM_THREAD];
int num_thread;

void report_proc_time(int pid)
{
	char fname[80];
	FILE* procf;
	
	char cmd[80];
	unsigned long utime, stime;

	sprintf(fname, "/proc/%d/stat", pid);
	procf = fopen(fname, "r");
	if (procf == NULL) {
		printf("failed to open file %s\n", fname);
		assert(0 ==1);
	}

	fscanf(procf, "%d %s %*c %*d %*d %*d %*d %*d %*lu %*lu %*lu %*lu %*lu %lu %lu", &pid, cmd, &utime, &stime);
	printf("pid=%d, cmd: %s, time(ms): %lu, utime(ms): %lu, stime(ms): %lu\n", pid, cmd, (utime+stime)*10, utime*10, stime*10);

	fclose(procf);
}

void report_time(void)
{
	int i;
	printf("-----------------------------------------\n");
	for (i=0; i< num_thread; i++)
		report_proc_time(pids[i]);
}

main() 
{
	int i;
	int pid;
	printf("input first pid : ");
	scanf("%d", &pid);
	printf("input num of threads: ");
	scanf("%d", &num_thread);
	for (i=0; i< num_thread; i++)
		pids[i] = pid + i;

	for (;;) {
		sleep(2);
		report_time();
	}
};