Function sleep_ms

test/core/test_select_blocking.c:23–25

#define TIMEOUT_MARGIN_MS 5

void sleep_ms(int ms) {
  usleep(ms * 1000);
}

int64_t timespec_delta_ms(struct timespec* begin, struct timespec* end) {
  int64_t delta_sec = end->tv_sec - begin->tv_sec;