1// timer.cc -- helper class for time accounting
2
3// Copyright 2009, 2010 Free Software Foundation, Inc.
4// Written by Rafael Avila de Espindola <espindola@google.com>.
5
6// This file is part of gold.
7
8// This program is free software; you can redistribute it and/or modify
9// it under the terms of the GNU General Public License as published by
10// the Free Software Foundation; either version 3 of the License, or
11// (at your option) any later version.
12
13// This program is distributed in the hope that it will be useful,
14// but WITHOUT ANY WARRANTY; without even the implied warranty of
15// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16// GNU General Public License for more details.
17
18// You should have received a copy of the GNU General Public License
19// along with this program; if not, write to the Free Software
20// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21// MA 02110-1301, USA.
22
23#include "gold.h"
24
25#ifdef HAVE_TIMES
26#include <sys/times.h>
27#endif
28
29#include "libiberty.h"
30
31#include "timer.h"
32
33namespace gold
34{
35
36// Class Timer
37
38Timer::Timer()
39{
40  this->start_time_.wall = 0;
41  this->start_time_.user = 0;
42  this->start_time_.sys = 0;
43}
44
45// Start couting the time.
46void
47Timer::start()
48{
49  this->get_time(&this->start_time_);
50}
51
52#if HAVE_SYSCONF && defined _SC_CLK_TCK
53# define TICKS_PER_SECOND sysconf (_SC_CLK_TCK) /* POSIX 1003.1-1996 */
54#else
55# ifdef CLK_TCK
56#  define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */
57# else
58#  ifdef HZ
59#   define TICKS_PER_SECOND HZ  /* traditional UNIX */
60#  else
61#   define TICKS_PER_SECOND 100 /* often the correct value */
62#  endif
63# endif
64#endif
65
66// times returns statistics in clock_t units. This variable will hold the
67// conversion factor to seconds. We use a variable that is initialize once
68// because sysconf can be slow.
69static long ticks_per_sec;
70class Timer_init
71{
72 public:
73  Timer_init()
74  {
75    ticks_per_sec = TICKS_PER_SECOND;
76  }
77};
78Timer_init timer_init;
79
80// Write the current time infortamion.
81void
82Timer::get_time(TimeStats *now)
83{
84#ifdef HAVE_TIMES
85  tms t;
86  now->wall = (times(&t) * 1000) / ticks_per_sec;
87  now->user = (t.tms_utime * 1000) / ticks_per_sec;
88  now->sys  = (t.tms_stime * 1000) / ticks_per_sec;
89#else
90  now->wall = get_run_time() / 1000;
91  now->user = 0;
92  now->sys = 0;
93#endif
94}
95
96// Return the stats since start was called.
97Timer::TimeStats
98Timer::get_elapsed_time()
99{
100  TimeStats now;
101  this->get_time(&now);
102  TimeStats delta;
103  delta.wall = now.wall - this->start_time_.wall;
104  delta.user = now.user - this->start_time_.user;
105  delta.sys = now.sys - this->start_time_.sys;
106  return delta;
107}
108
109}
110