v2 8211718: Supporting multiple concurrent OopStorage iterators
202 void push_back(const Block& block);
203 void unlink(const Block& block);
204 };
205
206 private:
207 const char* _name;
208 ActiveArray* _active_array;
209 AllocationList _allocation_list;
210 Block* volatile _deferred_updates;
211
212 Mutex* _allocation_mutex;
213 Mutex* _active_mutex;
214
215 // Volatile for racy unlocked accesses.
216 volatile size_t _allocation_count;
217
218 // Protection for _active_array.
219 mutable SingleWriterSynchronizer _protect_active;
220
221 // mutable because this gets set even for const iteration.
222 mutable bool _concurrent_iteration_active;
223
224 Block* find_block_or_null(const oop* ptr) const;
225 void delete_empty_block(const Block& block);
226 bool reduce_deferred_updates();
227
228 // Managing _active_array.
229 bool expand_active_array();
230 void replace_active_array(ActiveArray* new_array);
231 ActiveArray* obtain_active_array() const;
232 void relinquish_block_array(ActiveArray* array) const;
233 class WithActiveArray; // RAII helper for active array access.
234
235 template<typename F, typename Storage>
236 static bool iterate_impl(F f, Storage* storage);
237
238 // Implementation support for parallel iteration
239 class BasicParState;
240
241 // Wrapper for OopClosure-style function, so it can be used with
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202 void push_back(const Block& block);
203 void unlink(const Block& block);
204 };
205
206 private:
207 const char* _name;
208 ActiveArray* _active_array;
209 AllocationList _allocation_list;
210 Block* volatile _deferred_updates;
211
212 Mutex* _allocation_mutex;
213 Mutex* _active_mutex;
214
215 // Volatile for racy unlocked accesses.
216 volatile size_t _allocation_count;
217
218 // Protection for _active_array.
219 mutable SingleWriterSynchronizer _protect_active;
220
221 // mutable because this gets set even for const iteration.
222 mutable int _concurrent_iteration_count;
223
224 Block* find_block_or_null(const oop* ptr) const;
225 void delete_empty_block(const Block& block);
226 bool reduce_deferred_updates();
227
228 // Managing _active_array.
229 bool expand_active_array();
230 void replace_active_array(ActiveArray* new_array);
231 ActiveArray* obtain_active_array() const;
232 void relinquish_block_array(ActiveArray* array) const;
233 class WithActiveArray; // RAII helper for active array access.
234
235 template<typename F, typename Storage>
236 static bool iterate_impl(F f, Storage* storage);
237
238 // Implementation support for parallel iteration
239 class BasicParState;
240
241 // Wrapper for OopClosure-style function, so it can be used with
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