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#ifndef HIGH_RES_TIME_FUNCTIONS_H
#define HIGH_RES_TIME_FUNCTIONS_H
#include <ctime>
#include <sys/time.h>
#include <cmath>
/* Requires the librt and libm libraries */
static const long NSEC_PER_SEC = 1000000000L;
static inline bool
timespec_greater(const struct timespec* t1,
const struct timespec* t0)
{
return ((t1->tv_sec > t0->tv_sec) ||
((t1->tv_sec == t0->tv_sec) &&
(t1->tv_nsec > t0->tv_nsec)));
}
static inline bool
timespec_greater(const struct timespec t1,
const struct timespec t0)
{
return ((t1.tv_sec > t0.tv_sec) ||
((t1.tv_sec == t0.tv_sec) &&
(t1.tv_nsec > t0.tv_nsec)));
}
static inline bool
timespec_less(const struct timespec* t1,
const struct timespec* t0)
{
return ((t1->tv_sec < t0->tv_sec) ||
((t1->tv_sec == t0->tv_sec) &&
(t1->tv_nsec < t0->tv_nsec)));
}
static inline bool
timespec_less(const struct timespec t1,
const struct timespec t0)
{
return ((t1.tv_sec < t0.tv_sec) ||
((t1.tv_sec == t0.tv_sec) &&
(t1.tv_nsec < t0.tv_nsec)));
}
static inline bool
timespec_equal(const struct timespec* t1,
const struct timespec* t0)
{
return ((t1->tv_sec == t0->tv_sec) &&
(t1->tv_nsec == t0->tv_nsec));
}
static inline bool
timespec_equal(const struct timespec t1,
const struct timespec t0)
{
return ((t1.tv_sec == t0.tv_sec) &&
(t1.tv_nsec == t0.tv_nsec));
}
static inline void
timespec_reset(struct timespec* ret)
{
ret->tv_sec = 0;
ret->tv_nsec = 0;
}
static inline void
set_normalized_timespec(struct timespec *ts,
time_t sec, long nsec)
{
while (nsec > NSEC_PER_SEC) {
nsec -= NSEC_PER_SEC;
++sec;
}
while(nsec < 0) {
nsec += NSEC_PER_SEC;
--sec;
}
ts->tv_sec = sec;
ts->tv_nsec = nsec;
}
static inline struct timespec
convert_to_timespec(const double timeValue)
{
struct timespec ret;
double seconds = 0;
long nsec = static_cast<long>(modf(timeValue, &seconds) *
static_cast<double>(NSEC_PER_SEC));
time_t sec = static_cast<time_t>(seconds);
set_normalized_timespec(&ret, sec, nsec);
return ret;
}
static inline double
convert_from_timespec(const timespec actual)
{
return (static_cast<double>(actual.tv_sec) +
(static_cast<double>(actual.tv_nsec) /
static_cast<double>(NSEC_PER_SEC)));
}
static inline void
timespec_add(struct timespec *ret,
const struct timespec* t1,
const struct timespec* t0)
{
time_t sec = t1->tv_sec + t0->tv_sec;
long nsec = t1->tv_nsec + t0->tv_nsec;
set_normalized_timespec(ret, sec, nsec);
}
static inline void
timespec_add(struct timespec *ret,
const struct timespec t1,
const struct timespec t0)
{
return timespec_add(ret, &t1, &t0);
}
static inline struct timespec
timespec_add(const struct timespec t1,
const struct timespec t0)
{
struct timespec ret;
timespec_add(&ret, &t1, &t0);
return ret;
}
static inline struct timespec
timespec_add(const struct timespec t1,
const double time0)
{
struct timespec ret;
struct timespec t0;
t0 = convert_to_timespec(time0);
timespec_add(&ret, &t1, &t0);
return ret;
}
static inline void
timespec_subtract(struct timespec *ret,
const struct timespec* t1,
const struct timespec* t0)
{
time_t sec = t1->tv_sec - t0->tv_sec;
long nsec = t1->tv_nsec - t0->tv_nsec;
set_normalized_timespec(ret, sec, nsec);
}
static inline void
timespec_subtract(struct timespec *ret,
const struct timespec t1,
const struct timespec t0)
{
return timespec_subtract(ret, &t1, &t0);
}
static inline struct timespec
timespec_subtract(const struct timespec t1,
const struct timespec t0)
{
struct timespec ret;
timespec_subtract(&ret, &t1, &t0);
return ret;
}
static inline struct timespec
timespec_subtract(const struct timespec t1,
const double time0)
{
struct timespec ret;
struct timespec t0;
t0 = convert_to_timespec(time0);
timespec_subtract(&ret, &t1, &t0);
return ret;
}
static inline double
diff_timespec(struct timespec* ret,
const struct timespec *t1,
const struct timespec* t0)
{
struct timespec actual;
time_t sec = 0;
long nsec = 0;
if(timespec_greater(t1, t0)){
sec = t1->tv_sec - t0->tv_sec;
nsec = t1->tv_nsec - t0->tv_nsec;
set_normalized_timespec(&actual, sec, nsec);
if(ret != NULL){
ret->tv_sec = actual.tv_sec;
ret->tv_nsec = actual.tv_nsec;
}
return convert_from_timespec(actual);
}
else{
sec = t0->tv_sec - t1->tv_sec;
nsec = t0->tv_nsec - t1->tv_nsec;
// Do nothing with the ret value as the ret value
// would have to store a negative, which it can't.
set_normalized_timespec(&actual, sec, nsec);
return (-convert_from_timespec(actual));
}
}
static inline double
diff_timespec(struct timespec* ret,
const struct timespec t1,
const struct timespec t0)
{
return diff_timespec(ret, &t1, &t0);
}
static inline double
diff_timespec(const struct timespec t1,
const struct timespec t0)
{
return diff_timespec(NULL, &t1, &t0);
}
static inline double
diff_timespec(const struct timespec* t1,
const struct timespec* t0)
{
return diff_timespec(NULL, t1, t0);
}
#ifdef CLOCK_REALTIME
// If we can use clock_gettime, use it;
// otherwise, use gettimeofday
static inline void
get_highres_clock(struct timespec* ret)
{
if(clock_gettime(CLOCK_REALTIME, ret) != 0){
// Unable to get high resolution time -
// fail over to low resolution time
timeval lowResTime;
gettimeofday(&lowResTime, NULL);
ret->tv_sec = lowResTime.tv_sec;
ret->tv_nsec = lowResTime.tv_usec*1000;
}
}
#else
// Trick timer functions into thinking it has an nsec timer
// but only use the low resolution (usec) timer.
static inline void
get_highres_clock(struct timespec* ret)
{
timeval lowResTime;
gettimeofday(&lowResTime, NULL);
ret->tv_sec = lowResTime.tv_sec;
ret->tv_nsec = lowResTime.tv_usec*1000;
}
#endif
static inline struct timespec
get_highres_clock()
{
struct timespec ret;
get_highres_clock(&ret);
return ret;
}
static inline bool
timespec_empty(const struct timespec* ret)
{
return ( (ret->tv_sec == 0 ) && (ret->tv_nsec == 0) );
}
static inline bool
timespec_empty(const struct timespec ret)
{
return timespec_empty(&ret);
}
#endif /* HIGH_RES_TIME_FUNCTIONS_H */
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