Pause.C

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/*!@file Util/Pause.C simple pause toggle */

// //////////////////////////////////////////////////////////////////// //
// The iLab Neuromorphic Vision C++ Toolkit - Copyright (C) 2000-2005   //
// by the University of Southern California (USC) and the iLab at USC.  //
// See http://iLab.usc.edu for information about this project.          //
// //////////////////////////////////////////////////////////////////// //
// Major portions of the iLab Neuromorphic Vision Toolkit are protected //
// under the U.S. patent ``Computation of Intrinsic Perceptual Saliency //
// in Visual Environments, and Applications'' by Christof Koch and      //
// Laurent Itti, California Institute of Technology, 2001 (patent       //
// pending; application number 09/912,225 filed July 23, 2001; see      //
// http://pair.uspto.gov/cgi-bin/final/home.pl for current status).     //
// //////////////////////////////////////////////////////////////////// //
// This file is part of the iLab Neuromorphic Vision C++ Toolkit.       //
//                                                                      //
// The iLab Neuromorphic Vision C++ Toolkit is free software; you can   //
// redistribute it and/or modify it under the terms of the GNU General  //
// Public License as published by the Free Software Foundation; either  //
// version 2 of the License, or (at your option) any later version.     //
//                                                                      //
// The iLab Neuromorphic Vision C++ Toolkit is distributed in the hope  //
// that it will be useful, but WITHOUT ANY WARRANTY; without even the   //
// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      //
// PURPOSE.  See the GNU General Public License for more details.       //
//                                                                      //
// You should have received a copy of the GNU General Public License    //
// along with the iLab Neuromorphic Vision C++ Toolkit; if not, write   //
// to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,   //
// Boston, MA 02111-1307 USA.                                           //
// //////////////////////////////////////////////////////////////////// //
//
// Primary maintainer for this file: Rob Peters <rjpeters at usc dot edu>
// $HeadURL: svn://isvn.usc.edu/software/invt/trunk/saliency/src/Util/Pause.C $
// $Id: Pause.C 6986 2006-08-10 23:51:03Z rjpeters $
//

#ifndef UTIL_PAUSE_C_DEFINED
#define UTIL_PAUSE_C_DEFINED

#include "Util/Pause.H"

#include "Util/log.H"
#include "rutz/atomic.h"

#include <unistd.h>

namespace
{
  rutz::atomic_int_t status;
}

void setPause(bool on)
{
  status.atomic_set(int(on));
}

bool isPaused()
{
  return bool(status.atomic_get());
}

PauseWaiter::PauseWaiter(const int usecs)
  :
  itsUsecsWait(usecs),
  itsInPause(false)
{}

bool PauseWaiter::checkPause()
{
  if (isPaused())
    {
      if (!itsInPause)
        LINFO("****** PAUSED ******");

      itsInPause = true;

      usleep(itsUsecsWait);
    }
  else
    {
      if (itsInPause)
        LINFO("****** RESUMING ******");

      itsInPause = false;
    }

  return itsInPause;
}

// ######################################################################
/* So things look consistent in everyone's emacs... */
/* Local Variables: */
/* mode: c++ */
/* indent-tabs-mode: nil */
/* End: */

#endif // UTIL_PAUSE_C_DEFINED