This is xnu-10002.1.13. See this file in:
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <mach/mach_time.h>
#include <darwintest.h>
#include <darwintest_utils.h>
T_GLOBAL_META(T_META_RUN_CONCURRENTLY(true));
#define T_LOG_VERBOSE(...)
#define timespec2nanosec(ts) ((uint64_t)((ts)->tv_sec) * NSEC_PER_SEC + (uint64_t)((ts)->tv_nsec))
T_DECL(mach_get_times, "mach_get_times()",
T_META_CHECK_LEAKS(false), T_META_ALL_VALID_ARCHS(true))
{
const int ITERATIONS = 500000 * dt_ncpu();
struct timespec gtod_ts;
uint64_t last_absolute, last_continuous, last_gtod;
T_QUIET; T_ASSERT_EQ(mach_get_times(&last_absolute, &last_continuous, >od_ts), KERN_SUCCESS, NULL);
last_gtod = timespec2nanosec(>od_ts);
for (int i = 0; i < ITERATIONS; i++) {
uint64_t absolute, continuous, gtod;
T_QUIET; T_ASSERT_EQ(mach_get_times(&absolute, &continuous, >od_ts), KERN_SUCCESS, NULL);
gtod = timespec2nanosec(>od_ts);
T_LOG_VERBOSE("[%d] abs: %llu.%09llu(+%llu)\tcont: %llu.%09llu(+%llu)\tgtod:%llu.%09llu(+%llu)", i,
absolute / NSEC_PER_SEC, absolute % NSEC_PER_SEC, absolute - last_absolute,
continuous / NSEC_PER_SEC, continuous % NSEC_PER_SEC, continuous - last_continuous,
gtod / NSEC_PER_SEC, gtod % NSEC_PER_SEC, gtod - last_gtod);
T_QUIET; T_EXPECT_EQ(absolute - last_absolute, continuous - last_continuous, NULL);
int64_t gtod_diff = (int64_t)gtod - (int64_t)last_gtod;
T_QUIET; T_ASSERT_LE((uint64_t)llabs(gtod_diff), NSEC_PER_SEC, NULL);
last_absolute = absolute;
last_continuous = continuous;
last_gtod = gtod;
gtod_ts.tv_sec = 0; gtod_ts.tv_nsec = 0;
}
}