Method AfterForkChild

cpp/src/arrow/util/atfork_internal.cc:115–132

  }

  void AfterForkChild() {
    // Need to reinitialize the mutex as it is probably invalid.  Also, the
    // old mutex destructor may fail.
    // Fortunately, we are a single thread in the child process by now, so no
    // additional synchronization is needed.
    new (&mutex_) std::mutex;

    auto handlers = std::move(handlers_while_forking_);
    handlers_while_forking_.clear();

    // Execute handlers in reverse order
    for (auto it = handlers.rbegin(); it != handlers.rend(); ++it) {
      auto&& handler = *it;
      if (handler.handler->child_after) {
        handler.handler->child_after(std::move(handler.token));
      }
    }
  }

  void RegisterAtFork(std::weak_ptr<AtForkHandler> weak_handler) {
    std::lock_guard<std::mutex> lock(mutex_);