text: /*
   * Copyright 2016 Facebook, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <folly/ThreadCachedArena.h>
  
  #include <memory>
  
  namespace folly {
  
  ThreadCachedArena::ThreadCachedArena(size_t minBlockSize, size_t maxAlign)
    : minBlockSize_(minBlockSize), maxAlign_(maxAlign) {
  }
  
  SysArena* ThreadCachedArena::allocateThreadLocalArena() {
    SysArena* arena =
      new SysArena(minBlockSize_, SysArena::kNoSizeLimit, maxAlign_);
    auto disposer = [this] (SysArena* t, TLPDestructionMode mode) {
      std::unique_ptr<SysArena> tp(t);  // ensure it gets deleted
      if (mode == TLPDestructionMode::THIS_THREAD) {
        zombify(std::move(*t));
      }
    };
    arena_.reset(arena, disposer);
    return arena;
  }
  
  void ThreadCachedArena::zombify(SysArena&& arena) {
    zombies_->merge(std::move(arena));
  }
  
  size_t ThreadCachedArena::totalSize() const {
    size_t result = sizeof(ThreadCachedArena);
    for (const auto& arena : arena_.accessAllThreads()) {
      result += arena.totalSize();
    }
    result += zombies_->totalSize() - sizeof(SysArena);
    return result;
  }
  
  }  // namespace folly
  