modules/core/include/dpl/singleton_safe_impl.h

   1 /*
   2  * Copyright (c) 2011 Samsung Electronics Co., Ltd All Rights Reserved
   3  *
   4  *    Licensed under the Apache License, Version 2.0 (the "License");
   5  *    you may not use this file except in compliance with the License.
   6  *    You may obtain a copy of the License at
   7  *
   8  *        http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  *    Unless required by applicable law or agreed to in writing, software
  11  *    distributed under the License is distributed on an "AS IS" BASIS,
  12  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  *    See the License for the specific language governing permissions and
  14  *    limitations under the License.
  15  */
  16 /*
  17  * @file        singleton_safe_impl.h
  18  * @author      Tomasz Swierczek (t.swierczek@samsung.com)
  19  * @version     1.0
  20  * @brief       This file is the implementation file of singleton
  21  */
  22 #ifndef DPL_SINGLETON_SAFE_IMPL_H
  23 #define DPL_SINGLETON_SAFE_IMPL_H
  24
  25 #define IMPLEMENT_SAFE_SINGLETON(Class)                                        \
  26 namespace DPL {                                                                \
  27 template<>                                                                     \
  28 Singleton<Class>& Singleton<Class>::InternalInstance()                         \
  29 {                                                                              \
  30     static Singleton<Class> instance;                                          \
  31     return instance;                                                           \
  32 }                                                                              \
  33                                                                                \
  34 template<>                                                                     \
  35 Class &Singleton<Class>::Instance()                                            \
  36 {                                                                              \
  37     Singleton<Class>& instance = Singleton<Class>::InternalInstance();         \
  38     if (!!instance.m_guard)                                                    \
  39     {                                                                          \
  40         Assert(Thread::GetCurrentThread() == *instance.m_guard &&              \
  41                "Singleton thread guard failed. A forbidden call from foreign thread was detected!");\
  42     }                                                                          \
  43     return instance;                                                           \
  44 }                                                                              \
  45                                                                                \
  46 template<>                                                                     \
  47 void Singleton<Class>::SetThreadGuard(Thread *thread)                          \
  48 {                                                                              \
  49     Singleton<Class>& instance = Singleton<Class>::InternalInstance();         \
  50     instance.m_guard = OptionalThreadPtr(thread);                              \
  51 }                                                                              \
  52                                                                                \
  53 template<>                                                                     \
  54 void Singleton<Class>::ResetThreadGuard()                                      \
  55 {                                                                              \
  56     Singleton<Class>& instance = Singleton<Class>::InternalInstance();         \
  57     instance.m_guard = OptionalThreadPtr::Null;                                \
  58 }                                                                              \
  59 template Singleton<Class>& Singleton<Class>::InternalInstance();               \
  60 template Class& Singleton<Class>::Instance();                                  \
  61 template void Singleton<Class>::SetThreadGuard(Thread *thread);                \
  62 template void Singleton<Class>::ResetThreadGuard();                            \
  63 } // namespace DPL
  64
  65
  66 #endif // DPL_SINGLETON_SAFE_IMPL_H