128     // We need to wait for the pending wait process and stop it.  in run()
234             // We've already been running and there might a completion pending.  in caller_run()
247         // There might be pending completions still, so spawn a watcher for  in caller_run()
255     auto worker = std::exchange(pending, nullptr);  in wait_for_wait_process_stopped()
280     // need to `wait`, because there might be yet another pending operation  in start()
306     // Assign ourselves as the pending completion and release the caller.  in start()
322             return (ctx.pending != nullptr) || (ctx.staged != nullptr) ||  in wait_once()
326         // Save the waiter as pending.  in wait_once()
327         if (ctx.pending == nullptr)  in wait_once()
329             ctx.pending = std::exchange(ctx.staged, nullptr);  in wait_once()
335     if (!ctx.final_stop.stop_requested() && ctx.pending)  in wait_once()
337         ctx.event_loop.run_one(ctx.pending->timeout);  in wait_once()
345     auto pending = std::exchange(self->pending, nullptr);  in dbus_event_handle()  local
346     if (pending != nullptr)  in dbus_event_handle()
348         pending->complete();  in dbus_event_handle()