src/base/time.cc

   1 /*
   2  * Copyright (c) 2003-2005 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  * Authors: Nathan Binkert
  29  */
  30
  31 #include <cctype>
  32 #include <cstring>
  33 #include <ctime>
  34 #include <iostream>
  35 #include <string>
  36
  37 #include "base/time.hh"
  38
  39 using namespace std;
  40
  41 struct _timeval
  42 {
  43     timeval tv;
  44 };
  45
  46 double
  47 convert(const timeval &tv)
  48 {
  49     return (double)tv.tv_sec + (double)tv.tv_usec / 1000000.0;
  50 }
  51
  52 Time::Time(bool set_now)
  53 {
  54     time = new _timeval;
  55     if (set_now)
  56         set();
  57 }
  58
  59 Time::Time(const timeval &val)
  60 {
  61     time = new _timeval;
  62     set(val);
  63 }
  64
  65 Time::Time(const Time &val)
  66 {
  67     time = new _timeval;
  68     set(val.get());
  69 }
  70
  71 Time::~Time()
  72 {
  73     delete time;
  74 }
  75
  76 const timeval &
  77 Time::get() const
  78 {
  79     return time->tv;
  80 }
  81
  82 void
  83 Time::set()
  84 {
  85     ::gettimeofday(&time->tv, NULL);
  86 }
  87
  88 void
  89 Time::set(const timeval &tv)
  90 {
  91     memcpy(&time->tv, &tv, sizeof(timeval));
  92 }
  93
  94 double
  95 Time::operator()() const
  96 {
  97     return convert(get());
  98 }
  99
 100 string
 101 Time::date(string format) const
 102 {
 103     const timeval &tv = get();
 104     time_t sec = tv.tv_sec;
 105     char buf[256];
 106
 107     if (format.empty()) {
 108 #ifdef __SUNPRO_CC
 109         ctime_r(&sec, buf, 256);
 110 #else
 111         ctime_r(&sec, buf);
 112 #endif
 113         buf[24] = '\0';
 114         return buf;
 115     }
 116
 117     struct tm *tm = localtime(&sec);
 118     strftime(buf, sizeof(buf), format.c_str(), tm);
 119     return buf;
 120 }
 121
 122 ostream &
 123 operator<<(ostream &out, const Time &start)
 124 {
 125     out << start.date();
 126     return out;
 127 }
 128
 129 Time
 130 operator-(const Time &l, const Time &r)
 131 {
 132     timeval tv;
 133     timersub(&l.get(), &r.get(), &tv);
 134     return tv;
 135 }
 136
 137 const Time Time::start(true);