node/deps/uv/test/test-hrtime.c

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#include "uv.h"
#include "task.h"

#ifndef MILLISEC
# define MILLISEC 1000
#endif

#ifndef NANOSEC
# define NANOSEC 1000000000
#endif


TEST_IMPL(hrtime) {
  uint64_t a, b, diff;

  a = uv_hrtime();
  uv_sleep(100);
  b = uv_hrtime();

  diff = b - a;

  printf("diff = %llu\n", (unsigned long long int) diff);

  /* The windows Sleep() function has only a resolution of 10-20 ms. */
  /* Check that the difference between the two hrtime values is somewhat in */
  /* the range we expect it to be. */
  ASSERT(diff > (uint64_t) 80 * NANOSEC / MILLISEC);
  ASSERT(diff < (uint64_t) 120 * NANOSEC / MILLISEC);
  return 0;
}