Function notify

test/pthread/test_pthread_reltime.cpp:40–63

EMSCRIPTEN_KEEPALIVE
extern "C" int notify() {
  {
    std::unique_lock<std::mutex> lock(mutex);
    std::cout << "notifying ..." << std::endl;
    ping = now();
    pong_requested = true;
    cond_var.notify_one();
  }

  {
    std::unique_lock<std::mutex> lock(mutex);
    while (pong_requested)
      cond_var.wait(lock);
    long last = now();
    std::cout << "last - pong: " << (last - ping) << std::endl;

    // Time measured on a worker should be relative to the main thread,
    // so that things are basically monotonic.
    assert((int(pong >= ping) + 2 * int(last >= pong)) == 3);
    emscripten_force_exit(0);
  }

  return 0;
}

int main() {
  std::cout << "running main ..." << std::endl;