text: // Copyright (C) 2013 The Libphonenumber Authors
  //
  // 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.
  
  // Author: Philippe Liard
  
  #ifndef I18N_PHONENUMBERS_BASE_THREAD_CHECKER_H_
  #define I18N_PHONENUMBERS_BASE_THREAD_CHECKER_H_
  
  #if !defined(I18N_PHONENUMBERS_USE_BOOST)
  
  // Note that I18N_PHONENUMBERS_NO_THREAD_SAFETY must be defined only to let the
  // user of the library know that it can't be used in a thread-safe manner when
  // it is not depending on Boost.
  #if !defined(__linux__) && !defined(__APPLE__) && \
      !defined(I18N_PHONENUMBERS_NO_THREAD_SAFETY)
  #error Building without Boost, please provide \
         -DI18N_PHONENUMBERS_NO_THREAD_SAFETY
  #endif
  
  #endif
  
  #if !defined(NDEBUG) && !defined(I18N_PHONENUMBERS_USE_BOOST) && \
      (defined(__linux__) || defined(__apple__))
  
  #include <pthread.h>
  
  namespace i18n {
  namespace phonenumbers {
  
  class ThreadChecker {
   public:
    ThreadChecker() : thread_id_(pthread_self()) {}
  
    bool CalledOnValidThread() const {
      return thread_id_ == pthread_self();
    }
  
   private:
    const pthread_t thread_id_;
  };
  
  #else
  
  namespace i18n {
  namespace phonenumbers {
  
  class ThreadChecker {
   public:
    bool CalledOnValidThread() const {
      return true;
    }
  };
  
  #endif
  
  }  // namespace phonenumbers
  }  // namespace i18n
  
  #endif  // I18N_PHONENUMBERS_BASE_THREAD_CHECKER_H_
  