tests/mach_get_times.c

   1 #include <stdlib.h>
   2 #include <time.h>
   3 #include <sys/time.h>
   4 #include <mach/mach_time.h>
   5
   6 #include <darwintest.h>
   7 #include <darwintest_utils.h>
   8
   9 #define T_LOG_VERBOSE(...)
  10
  11 #define timespec2nanosec(ts) ((uint64_t)((ts)->tv_sec) * NSEC_PER_SEC + (uint64_t)((ts)->tv_nsec))
  12
  13 T_DECL(mach_get_times, "mach_get_times()",
  14     T_META_CHECK_LEAKS(false), T_META_ALL_VALID_ARCHS(true))
  15 {
  16         const int ITERATIONS = 500000 * dt_ncpu();
  17         struct timespec gtod_ts;
  18
  19         uint64_t last_absolute, last_continuous, last_gtod;
  20         T_QUIET; T_ASSERT_EQ(mach_get_times(&last_absolute, &last_continuous, &gtod_ts), KERN_SUCCESS, NULL);
  21         last_gtod = timespec2nanosec(&gtod_ts);
  22
  23         for (int i = 0; i < ITERATIONS; i++) {
  24                 uint64_t absolute, continuous, gtod;
  25                 T_QUIET; T_ASSERT_EQ(mach_get_times(&absolute, &continuous, &gtod_ts), KERN_SUCCESS, NULL);
  26                 gtod = timespec2nanosec(&gtod_ts);
  27
  28                 T_LOG_VERBOSE("[%d] abs: %llu.%09llu(+%llu)\tcont: %llu.%09llu(+%llu)\tgtod:%llu.%09llu(+%llu)", i,
  29                     absolute / NSEC_PER_SEC, absolute % NSEC_PER_SEC, absolute - last_absolute,
  30                     continuous / NSEC_PER_SEC, continuous % NSEC_PER_SEC, continuous - last_continuous,
  31                     gtod / NSEC_PER_SEC, gtod % NSEC_PER_SEC, gtod - last_gtod);
  32
  33                 T_QUIET; T_EXPECT_EQ(absolute - last_absolute, continuous - last_continuous, NULL);
  34
  35                 int64_t gtod_diff = (int64_t)gtod - (int64_t)last_gtod;
  36                 T_QUIET; T_ASSERT_LE((uint64_t)llabs(gtod_diff), NSEC_PER_SEC, NULL);
  37
  38                 last_absolute = absolute;
  39                 last_continuous = continuous;
  40                 last_gtod = gtod;
  41
  42                 gtod_ts.tv_sec = 0; gtod_ts.tv_nsec = 0;
  43         }
  44 }