Method thr_init

plugin/handler_socket/handlersocket/hstcpsvr_worker.cpp:313–315

struct thr_init {
  thr_init(const dbcontext_ptr& dc, volatile int& shutdown_flag) : dbctx(dc) {
    dbctx->init_thread(this, shutdown_flag);
  }
  ~thr_init() {
    dbctx->term_thread();
  }