1    :  // Copyright 2015 Google Inc. All Rights Reserved.
   2    :  //
   3    :  // Licensed under the Apache License, Version 2.0 (the "License");
   4    :  // you may not use this file except in compliance with the License.
   5    :  // You may obtain a copy of the License at
   6    :  //
   7    :  //     http://www.apache.org/licenses/LICENSE-2.0
   8    :  //
   9    :  // Unless required by applicable law or agreed to in writing, software
  10    :  // distributed under the License is distributed on an "AS IS" BASIS,
  11    :  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12    :  // See the License for the specific language governing permissions and
  13    :  // limitations under the License.
  14    :  
  15    :  #ifndef SYZYGY_KASKO_DLL_LIFETIME_H_
  16    :  #define SYZYGY_KASKO_DLL_LIFETIME_H_
  17    :  
  18    :  #include "base/macros.h"
  19    :  #include "base/memory/ref_counted.h"
  20    :  
  21  m :  namespace kasko {
  22    :  
  23    :  // Sets up and tears down global Kasko DLL state. Multiple instances may safely
  24    :  // exist simultaneously. Global state is set up when the first instance is
  25    :  // constructed and torn down when the last instance is destroyed. Construction
  26    :  // and destruction is not thread-safe.
  27  m :  class DllLifetime {
  28  m :   public:
  29  m :    DllLifetime();
  30  m :    ~DllLifetime();
  31    :  
  32  m :   private:
  33    :    // Holds global Kasko DLL state. Only a single Core instance will exist at any
  34    :    // time.
  35  m :    class Core;
  36    :  
  37    :    // A refcount to prevent the global Core instance from being destroyed while
  38    :    // this DllLifetime is alive.
  39  m :    scoped_refptr<Core> core_;
  40    :  
  41  m :    DISALLOW_COPY_AND_ASSIGN(DllLifetime);
  42  m :  };
  43    :  
  44  m :  }  // namespace kasko
  45    :  
  46    :  #endif  // SYZYGY_KASKO_DLL_LIFETIME_H_