maxikrie commented on issue #8207:
URL: https://github.com/apache/nuttx/issues/8207#issuecomment-1399331021
This however results in the desired behavior
```
printf("Hello, World!!\n");
uint32_t N = 1000;
uint32_t time[N];
useconds_t sleep_time = 100;
int tmr_id = open("/dev/timer0", O_RDONLY);
if (tmr_id < 0)
{
fprintf(stderr, "ERROR: Failed to open timer: %d\n", errno);
close(tmr_id);
return EXIT_FAILURE;
}
ioctl(tmr_id, TCIOC_SETTIMEOUT, 100);
struct timer_notify_s notify;
notify.pid = getpid();
notify.periodic = true;
notify.event.sigev_notify = SIGEV_SIGNAL;
notify.event.sigev_signo = SIGUSR1;
notify.event.sigev_value.sival_ptr = NULL;
int ret = ioctl(tmr_id, TCIOC_NOTIFICATION,
(unsigned long) ((uintptr_t) ¬ify));
if (ret < 0)
{
fprintf(stderr, "ERROR: Failed to set the timer handler: %d\n",
errno);
close(tmr_id);
return EXIT_FAILURE;
}
ret = ioctl(tmr_id, TCIOC_START, 0);
if (ret < 0)
{
fprintf(stderr, "ERROR: Failed to start the timer: %d\n",
errno);
close(tmr_id);
return EXIT_FAILURE;
}
sigset_t mask;
sigaddset(&mask, SIGUSR1);
struct timespec t1;
clock_gettime(0, &t1);
struct timespec t_start;
clock_gettime(0, &t_start);
for (int i = 0; i < N; i++)
{
siginfo_t info;
int bla = sigwaitinfo(&mask, &info);
struct timespec t2;
clock_gettime(0, &t2);
struct timespec dt;
clock_timespec_subtract(&t2, &t1, &dt);
t1 = t2;
time[i] = dt.tv_nsec / 1000;
}
struct timespec t_end;
clock_gettime(0, &t_end);
struct timespec dt;
clock_timespec_subtract(&t_end, &t_start, &dt);
printf("Average sleep time: %ld (%ld)\n", dt.tv_nsec / 1000 / N,
sleep_time);
for (int i = 0; i < N; i++)
{
printf("Iteration %d: sleep time %ld (%ld)\n", i, time[i],
sleep_time);
}
return 0;
```
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