64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
|
|
#define NANOSEC 1000000000.0
|
|
#define MILLISEC 1000
|
|
|
|
static struct timespec start;
|
|
|
|
void start_timer()
|
|
{
|
|
printf("timer started...\n");
|
|
clock_gettime(CLOCK_MONOTONIC, &start);
|
|
# ifdef DEBUG_TIMER
|
|
printf("sec=%d nsec=%d\n", start.tv_sec, start.tv_nsec);
|
|
# endif
|
|
}
|
|
|
|
void set_timer(timer)
|
|
struct timespec *timer;
|
|
{
|
|
clock_gettime(CLOCK_MONOTONIC, timer);
|
|
# ifdef DEBUG_TIMER
|
|
printf("timer: sec=%d nsec=%d orig: sec=%ld nsec=%ld\n",
|
|
timer->tv_sec, timer->tv_nsec, start.tv_sec, start.tv_nsec);
|
|
# endif
|
|
}
|
|
|
|
double get_timer(timer)
|
|
struct timespec timer;
|
|
{
|
|
double diff;
|
|
diff=(timer.tv_sec - start.tv_sec) + (timer.tv_nsec - start.tv_nsec) / NANOSEC;
|
|
# ifdef DEBUG_TIMER
|
|
printf("timer sec: %.5f\n", diff);
|
|
# endif
|
|
return diff;
|
|
}
|
|
|
|
#ifdef STANDALONE
|
|
int main(ac, av)
|
|
int ac;
|
|
char **av;
|
|
{
|
|
int delay;
|
|
struct timespec end, tsdelay;
|
|
|
|
if (ac != 2) {
|
|
fprintf(stderr, "usage: %s msecs\n", *av);
|
|
exit (1);
|
|
}
|
|
delay=atoi(*(av+1));
|
|
start_timer();
|
|
tsdelay.tv_sec=delay/MILLISEC;
|
|
tsdelay.tv_nsec=delay%MILLISEC;
|
|
printf("delay %d=%ld:%ld\n", delay, tsdelay.tv_sec, tsdelay.tv_nsec);
|
|
nanosleep(&tsdelay, NULL);
|
|
set_timer(&end);
|
|
printf("Time elapsed: %.5f seconds\n", get_timer(end));
|
|
|
|
return 0;
|
|
}
|
|
#endif
|