text: /*
   *
   *    Copyright (c) 2016-2017 Nest Labs, Inc.
   *    All rights reserved.
   *
   *    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.
   */
  
  /**
   *    @file
   *      This file contains definitions of member functions for class
   *      nl::Weave::System::Object.
   */
  
  // Include module header
  #include <SystemLayer/SystemObject.h>
  
  // Include common private header
  #include "SystemLayerPrivate.h"
  
  // Include local headers
  #include <SystemLayer/SystemLayer.h>
  #include <Weave/Support/CodeUtils.h>
  
  // Include local headers
  #include <stddef.h>
  #include <string.h>
  
  namespace nl {
  namespace Weave {
  namespace System {
  
  /**
   *  @brief
   *      Decrements the reference count for the Weave System Layer object. Recycles the object back into the pool if the reference
   *      count is decremented to zero. No destructor is invoked.
   */
  NL_DLL_EXPORT void Object::Release(void)
  {
      unsigned int oldCount = __sync_fetch_and_sub(&this->mRefCount, 1);
  
      if (oldCount == 1)
      {
          this->mSystemLayer = NULL;
          __sync_synchronize();
      }
      else if (oldCount == 0)
      {
          WeaveDie();
      }
  }
  
  NL_DLL_EXPORT bool Object::TryCreate(Layer& aLayer, size_t aOctets)
  {
      bool lReturn = false;
  
      if (__sync_bool_compare_and_swap(&this->mSystemLayer, NULL, &aLayer))
      {
          this->mRefCount = 0;
          this->AppState = NULL;
          memset(reinterpret_cast<char*>(this) + sizeof(*this), 0, aOctets - sizeof(*this));
  
          this->Retain();
          lReturn = true;
      }
  
      return lReturn;
  }
  
  #if WEAVE_SYSTEM_CONFIG_USE_LWIP
  void Object::DeferredRelease(Object::ReleaseDeferralErrorTactic aTactic)
  {
      Layer& lSystemLayer = *this->mSystemLayer;
      Error lError = lSystemLayer.PostEvent(*this, Weave::System::kEvent_ReleaseObj, 0);
  
      if (lError != WEAVE_SYSTEM_NO_ERROR)
      {
          switch (aTactic)
          {
          case kReleaseDeferralErrorTactic_Ignore:
              break;
  
          case kReleaseDeferralErrorTactic_Release:
              this->Release();
              break;
  
          case kReleaseDeferralErrorTactic_Die:
              VerifyOrDieWithMsg(false, WeaveSystemLayer, "Object::DeferredRelease %p->PostEvent failed err(%d)", &lSystemLayer,
                  static_cast<int>(lError));
              break;
          }
      }
  }
  #endif // WEAVE_SYSTEM_CONFIG_USE_LWIP
  
  } // namespace System
  } // namespace Weave
  } // namespace nl
  