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#ifdef USE_INSTANT_OSX
#include "hitimes_interval.h"
#include <mach/mach.h>
#include <mach/mach_time.h>
/* All this OSX code is adapted from http://developer.apple.com/library/mac/#qa/qa1398/_index.html */
/*
* returns the conversion factor, this value is used to convert
* the value from hitimes_get_current_instant() into seconds
*/
long double hitimes_instant_conversion_factor()
{
static mach_timebase_info_data_t s_timebase_info;
static long double conversion_factor;
static uint64_t nano_conversion;
/**
* If this is the first time we've run, get the timebase.
* We can use denom == 0 to indicate that s_timebase_info is
* uninitialised because it makes no sense to have a zero
* denominator is a fraction.
*/
if ( s_timebase_info.denom == 0 ) {
mach_timebase_info(&s_timebase_info);
nano_conversion = s_timebase_info.numer / s_timebase_info.denom;
conversion_factor = (long double) (nano_conversion) * (1e9l);
}
return conversion_factor;
}
/*
* returns the mach absolute time, which has no meaning outside of a conversion
* factor.
*/
hitimes_instant_t hitimes_get_current_instant()
{
return mach_absolute_time();
}
#endif
Version data entries
28 entries across 28 versions & 3 rubygems