text: //////////////////////////////////////////////////////////////////////////////
  //
  // (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
  // Software License, Version 1.0. (See accompanying file
  // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  //
  // See http://www.boost.org/libs/interprocess for documentation.
  //
  //////////////////////////////////////////////////////////////////////////////
  
  #ifndef BOOST_INTERPROCESS_POSIX_CONDITION_HPP
  #define BOOST_INTERPROCESS_POSIX_CONDITION_HPP
  
  #if (defined _MSC_VER) && (_MSC_VER >= 1200)
  #  pragma once
  #endif
  
  #include <boost/interprocess/detail/config_begin.hpp>
  #include <boost/interprocess/detail/workaround.hpp>
  
  #include <pthread.h>
  #include <errno.h>
  #include <boost/interprocess/sync/posix/pthread_helpers.hpp>
  #include <boost/interprocess/sync/posix/ptime_to_timespec.hpp>
  #include <boost/interprocess/detail/posix_time_types_wrk.hpp>
  #include <boost/interprocess/sync/posix/mutex.hpp>
  #include <boost/assert.hpp>
  
  namespace boost {
  namespace interprocess {
  namespace ipcdetail {
  
  class posix_condition
  {
     //Non-copyable
     posix_condition(const posix_condition &);
     posix_condition &operator=(const posix_condition &);
  
     public:
     //!Constructs a posix_condition. On error throws interprocess_exception.
     posix_condition();
  
     //!Destroys *this
     //!liberating system resources.
     ~posix_condition();
  
     //!If there is a thread waiting on *this, change that
     //!thread's state to ready. Otherwise there is no effect.
     void notify_one();
  
     //!Change the state of all threads waiting on *this to ready.
     //!If there are no waiting threads, notify_all() has no effect.
     void notify_all();
  
     //!Releases the lock on the posix_mutex object associated with lock, blocks
     //!the current thread of execution until readied by a call to
     //!this->notify_one() or this->notify_all(), and then reacquires the lock.
     template <typename L>
     void wait(L& lock)
     {
        if (!lock)
           throw lock_exception();
        this->do_wait(*lock.mutex());
     }
  
     //!The same as:
     //!while (!pred()) wait(lock)
     template <typename L, typename Pr>
     void wait(L& lock, Pr pred)
     {
        if (!lock)
           throw lock_exception();
  
        while (!pred())
           this->do_wait(*lock.mutex());
     }
  
     //!Releases the lock on the posix_mutex object associated with lock, blocks
     //!the current thread of execution until readied by a call to
     //!this->notify_one() or this->notify_all(), or until time abs_time is reached,
     //!and then reacquires the lock.
     //!Returns: false if time abs_time is reached, otherwise true.
     template <typename L>
     bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time)
     {
        if(abs_time == boost::posix_time::pos_infin){
           this->wait(lock);
           return true;
        }
        if (!lock)
              throw lock_exception();
        return this->do_timed_wait(abs_time, *lock.mutex());
     }
  
     //!The same as:   while (!pred()) {
     //!                  if (!timed_wait(lock, abs_time)) return pred();
     //!               } return true;
     template <typename L, typename Pr>
     bool timed_wait(L& lock, const boost::posix_time::ptime &abs_time, Pr pred)
     {
        if(abs_time == boost::posix_time::pos_infin){
           this->wait(lock, pred);
           return true;
        }
        if (!lock)
              throw lock_exception();
        while (!pred()){
           if (!this->do_timed_wait(abs_time, *lock.mutex()))
              return pred();
        }
  
        return true;
     }
  
  
     void do_wait(posix_mutex &mut);
  
     bool do_timed_wait(const boost::posix_time::ptime &abs_time, posix_mutex &mut);
  
     private:
     pthread_cond_t   m_condition;
  };
  
  inline posix_condition::posix_condition()
  {
     int res;
     pthread_condattr_t cond_attr;
     res = pthread_condattr_init(&cond_attr);
     if(res != 0){
        throw interprocess_exception("pthread_condattr_init failed");
     }
     res = pthread_condattr_setpshared(&cond_attr, PTHREAD_PROCESS_SHARED);
     if(res != 0){
        pthread_condattr_destroy(&cond_attr);
        throw interprocess_exception(res);
     }
     res = pthread_cond_init(&m_condition, &cond_attr);
     pthread_condattr_destroy(&cond_attr);
     if(res != 0){
        throw interprocess_exception(res);
     }
  }
  
  inline posix_condition::~posix_condition()
  {
      int res = 0;
      res = pthread_cond_destroy(&m_condition);
      BOOST_ASSERT(res == 0); (void)res;
  }
  
  inline void posix_condition::notify_one()
  {
      int res = 0;
      res = pthread_cond_signal(&m_condition);
      BOOST_ASSERT(res == 0); (void)res;
  }
  
  inline void posix_condition::notify_all()
  {
      int res = 0;
      res = pthread_cond_broadcast(&m_condition);
      BOOST_ASSERT(res == 0); (void)res;
  }
  
  inline void posix_condition::do_wait(posix_mutex &mut)
  {
     pthread_mutex_t* pmutex = &mut.m_mut;
     int res = 0;
     res = pthread_cond_wait(&m_condition, pmutex);
     BOOST_ASSERT(res == 0); (void)res;
  }
  
  inline bool posix_condition::do_timed_wait
     (const boost::posix_time::ptime &abs_time, posix_mutex &mut)
  {
     timespec ts = ptime_to_timespec(abs_time);
     pthread_mutex_t* pmutex = &mut.m_mut;
     int res = 0;
     res = pthread_cond_timedwait(&m_condition, pmutex, &ts);
     BOOST_ASSERT(res == 0 || res == ETIMEDOUT);
  
     return res != ETIMEDOUT;
  }
  
  }  //namespace ipcdetail
  }  //namespace interprocess
  }  //namespace boost
  
  #include <boost/interprocess/detail/config_end.hpp>
  
  #endif   //#ifndef BOOST_INTERPROCESS_POSIX_CONDITION_HPP
  