<commit_before>//---------------------------------------------------------------------------
//    $Id$
//
//    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011 by the deal.II authors
//
//    This file is subject to QPL and may not be  distributed
//    without copyright and license information. Please refer
//    to the file deal.II/doc/license.html for the  text  and
//    further information on this license.
//
//---------------------------------------------------------------------------
#ifndef __deal2__timer_h
#define __deal2__timer_h

#include <deal.II/base/config.h>
#include <deal.II/base/conditional_ostream.h>
#include <deal.II/base/thread_management.h>
#include <deal.II/base/utilities.h>

#ifdef DEAL_II_COMPILER_SUPPORTS_MPI
#  include <mpi.h>
#endif

#include <string>
#include <list>
#include <map>

DEAL_II_NAMESPACE_OPEN

/**
 * This is a very simple class which provides information about both the CPU
 * time and the wallclock time elapsed since the timer was started last
 * time. Information is retrieved from the system on the basis of clock cycles
 * since last time the computer was booted for the CPU time. The wall time is
 * based on the system clock accessed by @p gettimeofday, with a typical
 * accuracy of 0.01 ms on linux systems.
 *
 *
 * <h3>Usage</h3>
 *
 * Use of this class is as you might expect by looking at the member
 * functions:
 * @code
 *   Timer timer;
 *   timer.start ();
 *
 *   // do some complicated computations here
 *   ...
 *
 *   timer.stop ();
 *
 *   std::cout << "Elapsed CPU time: " << timer() << " seconds.";
 *   std::cout << "Elapsed wall time: " << timer.wall_time() << " seconds.";
 *
 *   // reset timer for the next thing it shall do
 *   timer.reset();
 * @endcode
 *
 * Alternatively, you can also restart the timer instead of resetting
 * it. The times between successive calls to start() / stop() will then be
 * accumulated. The usage of this class is also explained in the
 * step-12 and step-29 tutorial programs.
 *
 * @note Implementation of this class is system dependent. In case
 * multithreaded routines (matrix-vector products, error estimators, etc.) are
 * used, the CPU time is accumulated from all the children.
 *
 * @ingroup utilities
 * @author <NAME>, <NAME>, <NAME>
 */
class Timer
{
  public:
				     /**
				      * Constructor. Starts the timer at 0 sec.
				      */
    Timer ();

#ifdef DEAL_II_COMPILER_SUPPORTS_MPI
				     /**
				      * Constructor that takes an MPI
				      * communicator as input. A timer<commit_msg>Fix references to tutorial programs. step-12 doesn't use the Timer class any more.<commit_after>//---------------------------------------------------------------------------
//    $Id$
//
//    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011 by the deal.II authors
//
//    This file is subject to QPL and may not be  distributed
//    without copyright and license information. Please refer
//    to the file deal.II/doc/license.html for the  text  and
//    further information on this license.
//
//---------------------------------------------------------------------------
#ifndef __deal2__timer_h
#define __deal2__timer_h

#include <deal.II/base/config.h>
#include <deal.II/base/conditional_ostream.h>
#include <deal.II/base/thread_management.h>
#include <deal.II/base/utilities.h>

#ifdef DEAL_II_COMPILER_SUPPORTS_MPI
#  include <mpi.h>
#endif

#include <string>
#include <list>
#include <map>

DEAL_II_NAMESPACE_OPEN

/**
 * This is a very simple class which provides information about both the CPU
 * time and the wallclock time elapsed since the timer was started last
 * time. Information is retrieved from the system on the basis of clock cycles
 * since last time the computer was booted for the CPU time. The wall time is
 * based on the system clock accessed by @p gettimeofday, with a typical
 * accuracy of 0.01 ms on linux systems.
 *
 *
 * <h3>Usage</h3>
 *
 * Use of this class is as you might expect by looking at the member
 * functions:
 * @code
 *   Timer timer;
 *   timer.start ();
 *
 *   // do some complicated computations here
 *   ...
 *
 *   timer.stop ();
 *
 *   std::cout << "Elapsed CPU time: " << timer() << " seconds.";
 *   std::cout << "Elapsed wall time: " << timer.wall_time() << " seconds.";
 *
 *   // reset timer for the next thing it shall do
 *   timer.reset();
 * @endcode
 *
 * Alternatively, you can also restart the timer instead of resetting
 * it. The times between successive calls to start() / stop() will then be
 * accumulated. The usage of this class is also explained in the
 * step-28, step-29 and step-30 tutorial programs.
 *
 * @note Implementation of this class is system dependent. In case
 * multithreaded routines (matrix-vector products, error estimators, etc.) are
 * used, the CPU time is accumulated from all the children.
 *
 * @ingroup utilities
 * @author <NAME>, <NAME>, <NAME>
 */
class Timer
{
  public:
				     /**
				      * Constructor. Starts the timer at 0 sec.
				      */
    Timer ();

#ifdef DEAL_II_COMPILER_SUPPORTS_MPI
				     /**
				      * Constructor that takes an MPI
				      * communicator as input. A timer
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