75   struct Writer;
78     Writer* leader = nullptr;
79     Writer* last_writer = nullptr;
87       Writer* writer;
88       Writer* last_writer;
90       explicit Iterator(Writer* w, Writer* last)  in Iterator()
93       Writer* operator*() const { return writer; }
115   struct Writer {  struct
135     Writer* link_older;  // read/write only before linking, or as leader  argument
136     Writer* link_newer;  // lazy, read/write only before linking, or as leader  argument
138     Writer()  in Writer()  argument
156     Writer(const WriteOptions& write_options, WriteBatch* _batch,
177     ~Writer() {  in ~Writer()  argument
277   void JoinBatchGroup(Writer* w);
285   size_t EnterAsBatchGroupLeader(Writer* leader, WriteGroup* write_group);
295   void ExitAsBatchGroupFollower(Writer* w);
301   void EnterAsMemTableWriter(Writer* leader, WriteGroup* write_grup);
306   void ExitAsMemTableWriter(Writer* self, WriteGroup& write_group);
320   bool CompleteParallelMemTableWriter(Writer* w);
328   void EnterUnbatched(Writer* w, InstrumentedMutex* mu);
332   void ExitUnbatched(Writer* w);
370   std::atomic<Writer*> newest_writer_;
374   std::atomic<Writer*> newest_memtable_writer_;
383   Writer write_stall_dummy_;
393   uint8_t BlockingAwaitState(Writer* w, uint8_t goal_mask);
399   uint8_t AwaitState(Writer* w, uint8_t goal_mask, AdaptationContext* ctx);
402   void SetState(Writer* w, uint8_t new_state);
407   bool LinkOne(Writer* w, std::atomic<Writer*>* newest_writer);
412   bool LinkGroup(WriteGroup& write_group, std::atomic<Writer*>* newest_writer);
416   void CreateMissingNewerLinks(Writer* head);
420   Writer* FindNextLeader(Writer* pending_writer, Writer* boundary);
428   void CompleteFollower(Writer* w, WriteGroup& write_group);