text: #include "ace/System_Time.h"
  #include "ace/MMAP_Memory_Pool.h"
  #include "ace/Malloc_T.h"
  #include "ace/Null_Mutex.h"
  #include "ace/Time_Value.h"
  #include "ace/Lib_Find.h"
  
  #include "ace/OS_NS_string.h"
  #include "ace/OS_NS_time.h"
  
  
  
  ACE_BEGIN_VERSIONED_NAMESPACE_DECL
  
  ACE_System_Time::ACE_System_Time (const ACE_TCHAR *poolname)
    : shmem_ (0)
    , delta_time_ (0)
  {
    ACE_TRACE ("ACE_System_Time::ACE_System_Time");
  
    // Only create a new unique filename for the memory pool file
    // if the user didn't supply one...
    if (poolname == 0)
      {
  #if defined (ACE_DEFAULT_BACKING_STORE)
        // Create a temporary file.
        ACE_OS::strcpy (this->poolname_,
                        ACE_DEFAULT_BACKING_STORE);
  #else /* ACE_DEFAULT_BACKING_STORE */
        if (ACE::get_temp_dir (this->poolname_,
                                        MAXPATHLEN - 17) == -1)
          // -17 for ace-malloc-XXXXXX
          {
            ACELIB_ERROR ((LM_ERROR,
                        ACE_TEXT ("Temporary path too long, ")
                        ACE_TEXT ("defaulting to current directory\n")));
            this->poolname_[0] = 0;
          }
  
        // Add the filename to the end
        ACE_OS::strcat (this->poolname_, ACE_TEXT ("ace-malloc-XXXXXX"));
  
  #endif /* ACE_DEFAULT_BACKING_STORE */
      }
    else
      ACE_OS::strsncpy (this->poolname_,
                        poolname,
                        (sizeof this->poolname_ / sizeof (ACE_TCHAR)));
  
    ACE_NEW (this->shmem_,
             ALLOCATOR (this->poolname_));
  }
  
  ACE_System_Time::~ACE_System_Time (void)
  {
    ACE_TRACE ("ACE_System_Time::~ACE_System_Time");
    delete this->shmem_;
  }
  
  // Get the local system time.
  
  int
  ACE_System_Time::get_local_system_time (time_t & time_out)
  {
    ACE_TRACE ("ACE_System_Time::get_local_system_time");
    time_out = ACE_OS::time (0);
    return 0;
  }
  
  int
  ACE_System_Time::get_local_system_time (ACE_Time_Value &time_out)
  {
    ACE_TRACE ("ACE_System_Time::get_local_system_time");
    time_out.set (ACE_OS::time (0), 0);
    return 0;
  }
  
  // Get the system time of the central time server.
  
  int
  ACE_System_Time::get_master_system_time (time_t &time_out)
  {
    ACE_TRACE ("ACE_System_Time::get_master_system_time");
  
    if (this->delta_time_ == 0)
      {
        // Try to find it
        void * temp = 0;
        if (this->shmem_->find (ACE_DEFAULT_TIME_SERVER_STR, temp) == -1)
          {
            // No time entry in shared memory (meaning no Clerk exists)
            // so return the local time of the host.
            return this->get_local_system_time (time_out);
          }
        else
          // Extract the delta time.
          this->delta_time_ = static_cast<long *> (temp);
      }
  
    time_t local_time;
  
    // If delta_time is positive, it means that the system clock is
    // ahead of our local clock so add delta to the local time to get an
    // approximation of the system time. Else if delta time is negative,
    // it means that our local clock is ahead of the system clock, so
    // return the last local time stored (to avoid time conflicts).
    if (*this->delta_time_ >= 0 )
      {
        this->get_local_system_time (local_time);
        time_out = local_time + static_cast<ACE_UINT32> (*this->delta_time_);
      }
    else
      // Return the last local time. Note that this is stored as the
      // second field in shared memory.
      time_out = *(this->delta_time_ + 1);
    return 0;
  }
  
  int
  ACE_System_Time::get_master_system_time (ACE_Time_Value &time_out)
  {
    ACE_TRACE ("ACE_System_Time::get_master_system_time");
    time_t to;
    if (this->get_master_system_time (to) == -1)
      return -1;
    time_out.sec (to);
    return 0;
  }
  
  // Synchronize local system time with the central time server using
  // specified mode (currently unimplemented).
  
  int
  ACE_System_Time::sync_local_system_time (ACE_System_Time::Sync_Mode)
  {
    ACE_TRACE ("ACE_System_Time::sync_local_system_time");
    ACE_NOTSUP_RETURN (-1);
  }
  
  ACE_END_VERSIONED_NAMESPACE_DECL
  