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