sim/sim_time.hh

   1 /*
   2  * Copyright (c) 2003 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #ifndef __SIM_TIME_HH__
  30 #define __SIM_TIME_HH__
  31
  32 #include <sys/time.h>
  33
  34 #include <iosfwd>
  35
  36 namespace Time {
  37     struct _timeval;
  38     class Start
  39     {
  40       private:
  41         mutable _timeval *start;
  42
  43       public:
  44         Start();
  45         ~Start();
  46
  47         const timeval &get() const;
  48         void reset();
  49         double operator()() const;
  50     };
  51
  52     class Now
  53     {
  54       private:
  55         mutable _timeval *now;
  56
  57       public:
  58         Now();
  59         ~Now();
  60
  61         const timeval &get() const;
  62         double operator()() const;
  63     };
  64
  65     class Elapsed
  66     {
  67       private:
  68         mutable _timeval *elapsed;
  69         Start _start;
  70         Now _now;
  71
  72       public:
  73         Elapsed();
  74         ~Elapsed();
  75
  76         const timeval &get() const;
  77         void reset();
  78         double operator()() const;
  79     };
  80
  81     extern Start start;
  82     extern Now now;
  83     extern Elapsed elapsed;
  84
  85     std::ostream &operator<<(std::ostream &out, const Start &start);
  86     std::ostream &operator<<(std::ostream &out, const Now &now);
  87     std::ostream &operator<<(std::ostream &out, const Elapsed &elapsed);
  88 }
  89
  90 #endif // __SIM_TIME_HH__