tvtimer.h

TV-tree的c实现源码

/* 
 
                  COPYRIGHT NOTICE
 
This material was developed by Christos Faloutsos and King-Ip Lin
at the University of Maryland, College Park, Department of Computer Science.
Permission is granted to copy this software, to redistribute it
on a nonprofit basis, and to use it for any purpose, subject to
the following restrictions and understandings.
 
1. Any copy made of this software must include this copyright notice
in full.
 
2. All materials developed as a consequence of the use of this
software shall duly acknowledge such use, in accordance with the usual
standards of acknowledging credit in academic research.
 
3. The authors have made no warranty or representation that the
operation of this software will be error-free or suitable for any
application, and they are under under no obligation to provide any
services, by way of maintenance, update, or otherwise.  The software
is an experimental prototype offered on an as-is basis.
 
4. Redistribution for profit requires the express, written permission
of the authors.
 
*/

// Author : $Author$
// Date : $Date$
// Id : $Id$
#ifndef _TIMER_H
#define _TIMER_H

#include <iostream.h>

extern "C" {
#include <sys/resource.h>
#include <sys/time.h>
}


class Timer {
 private:
  static Timer   _global;             // Global timer

  char _state;                        // current state of timer 
  struct rusage  _ru_start, _ru_sum;  // start and sum for rusage timer
  struct timeval _tp_start, _tp_sum;  // start and sum for real-time timer

  char *_name;                        // Timers may be named

 public:
  enum { kRunning = 0x01 };

  static Timer global(); // Return a copy of the global timer

  Timer(char *name = (char *) NULL, char mode = 0);  // Creates new timer cleared at zero (dflt: stopped)

  float real();
  float system();
  float user();

  char* name();
  char  state();

  void sync();    // Synchronizes timer with the "global" timer
  void reset();   // Resets timer to zero
  void stop();    // Stops timer from counting
  void run();     // Lets timer continue counting

  // Display current value of time
  friend ostream& operator<<(ostream &os, Timer &t);
};

inline Timer Timer::global()
{
  return _global;
}

inline char* Timer::name()
{
  return _name;
}

inline char Timer::state()
{
  return _state;
}

#endif