urbit/outside/libuv_0.11/test/test-hrtime.c

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 *
 * The above copyright notice and this permission notice shall be included in
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#include "uv.h"
#include "task.h"

#ifndef MILLISEC
# define MILLISEC 1000
#endif

#ifndef NANOSEC
# define NANOSEC ((uint64_t) 1e9)
#endif


TEST_IMPL(hrtime) {
  uint64_t a, b, diff;
  int i = 75;
  while (i > 0) {
    a = uv_hrtime();
    uv_sleep(45);
    b = uv_hrtime();

    diff = b - a;

    /*  printf("i= %d diff = %llu\n", i, (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) 25 * NANOSEC / MILLISEC);
    ASSERT(diff < (uint64_t) 80 * NANOSEC / MILLISEC);
    --i;
  }
  return 0;
}