Method SignalHandler

src/global/signal_handler.cc:485–494

  ceph::mutex lock = ceph::make_mutex("SignalHandler::lock");

  SignalHandler() {
    // create signal pipe
    int r = pipe_cloexec(pipefd, 0);
    ceph_assert(r == 0);
    r = fcntl(pipefd[0], F_SETFL, O_NONBLOCK);
    ceph_assert(r == 0);

    // create thread
    create("signal_handler");
  }

  ~SignalHandler() override {
    shutdown();