void exec_task(task_t *task, int loop_1ms, int simtime)
{
int k; /* do not use i! */
int nr_jobs = simtime / task->T;
struct timeval tv, tv_C, tv_T, tv_D, tv_timeout;
int ret = RET_SUCCESS;
msecs_to_timeval(task->C, tv_C);
msecs_to_timeval(task->T, tv_T);
msecs_to_timeval(task->D, tv_D);
msecs_to_timeval(DEFAULT_TIMEOUT, tv_timeout);
/* get own PID. */
task->pid = getpid();
/* initialization for using RESCH. */
if (!rt_init()) {
printf("Error: cannot begin!\n");
ret = RET_MISS;
goto out;
}
xcpu_flag = 0;
rt_set_priority(task->prio);
rt_set_wcet(&tv_C);
rt_set_period(&tv_T);
rt_set_deadline(&tv_D);
rt_reserve_cpu(&tv_C, xcpu_handler);
rt_run(&tv_timeout);
/* busy loop. */
for (k = 0; k < nr_jobs; k++) {
while (!xcpu_flag) {
gettimeofday(&tv, NULL);
}
if (!rt_wait_for_period()) {
ret = RET_MISS;
break;
}
xcpu_flag = 0;
}
rt_exit();
out:
/* call _exit() but not exit(), since exit() may remove resources
that are shared with the parent and other child processes. */
_exit(ret);
/* no return. */
}
int main(int argc, char* argv[])
{
int i;
unsigned long prio;
struct timespec period, runtime, timeout;
struct timeval tv1, tv2, tv3;
if (argc != 3) {
printf("Error: invalid option\n");
}
prio = atoi(argv[1]); /* priority. */
period = ms_to_timespec(atoi(argv[2])); /* period. */
runtime = ms_to_timespec(1000); /* execution time. */
timeout = ms_to_timespec(1000); /* timeout. */
/* bannar. */
printf("sample program\n");
rt_init();
rt_set_period(period);
rt_set_runtime(runtime);
rt_set_scheduler(SCHED_FP); /* you can also set SCHED_EDF. */
rt_set_priority(prio);
rt_reserve_start(runtime, NULL); /* QoS is guaranteed. */
rt_run(timeout);
for (i = 0; i < 20; i++) {
gettimeofday(&tv1, NULL);
printf("start %lu:%06lu\n", tv1.tv_sec, tv1.tv_usec);
fflush(stdout);
do {
gettimeofday(&tv2, NULL);
/* tv2 - tv1 = tv3 */
tvsub(&tv2, &tv1, &tv3);
} while (tv3.tv_sec < 2);
printf("finish %lu:%06lu\n", tv2.tv_sec, tv2.tv_usec);
fflush(stdout);
if (!rt_wait_period()) {
printf("deadline is missed!\n");
}
}
rt_reserve_stop();
rt_exit();
return 0;
}
