Bad view benchmark

view.cc

void BM_View(int reps) {
  rcu::View<char> shared;
  SpawnNThreadsRunning(15, [&shared]() {
    for (int i = 0; i < reps; ++i) {
      auto snapshot = shared.Get();
      // ... do some meaningless work...
    }
  });
  for (int i = 0; i < reps; ++i) {
    auto snapshot = shared.Get();
    // ... do some meaningless work...
  }
  WaitForThreads();
}

BENCHMARK(BM_View)->Threads(1);