134 lines
3.1 KiB
C++
134 lines
3.1 KiB
C++
// timer.cc -- helper class for time accounting
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// Copyright 2009, 2010 Free Software Foundation, Inc.
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// Written by Rafael Avila de Espindola <espindola@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#include "gold.h"
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#include <unistd.h>
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#ifdef HAVE_TIMES
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#include <sys/times.h>
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#endif
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#include "libiberty.h"
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#include "timer.h"
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namespace gold
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{
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// Class Timer
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Timer::Timer()
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{
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this->start_time_.wall = 0;
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this->start_time_.user = 0;
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this->start_time_.sys = 0;
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}
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// Start counting the time.
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void
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Timer::start()
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{
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this->get_time(&this->start_time_);
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}
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// Record the time used by pass N (0 <= N <= 2).
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void
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Timer::stamp(int n)
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{
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gold_assert(n >= 0 && n <= 2);
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TimeStats& thispass = this->pass_times_[n];
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this->get_time(&thispass);
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}
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#if HAVE_SYSCONF && defined _SC_CLK_TCK
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# define TICKS_PER_SECOND sysconf (_SC_CLK_TCK) /* POSIX 1003.1-1996 */
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#else
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# ifdef CLK_TCK
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# define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */
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# else
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# ifdef HZ
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# define TICKS_PER_SECOND HZ /* traditional UNIX */
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# else
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# define TICKS_PER_SECOND 100 /* often the correct value */
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# endif
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# endif
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#endif
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// times returns statistics in clock_t units. This variable will hold the
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// conversion factor to seconds. We use a variable that is initialized once
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// because sysconf can be slow.
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static long ticks_per_sec;
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class Timer_init
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{
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public:
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Timer_init()
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{
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ticks_per_sec = TICKS_PER_SECOND;
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}
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};
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Timer_init timer_init;
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// Write the current time information.
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void
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Timer::get_time(TimeStats *now)
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{
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#ifdef HAVE_TIMES
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tms t;
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now->wall = (times(&t) * 1000) / ticks_per_sec;
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now->user = (t.tms_utime * 1000) / ticks_per_sec;
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now->sys = (t.tms_stime * 1000) / ticks_per_sec;
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#else
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now->wall = get_run_time() / 1000;
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now->user = 0;
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now->sys = 0;
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#endif
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}
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// Return the stats since start was called.
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Timer::TimeStats
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Timer::get_elapsed_time()
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{
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TimeStats now;
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this->get_time(&now);
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TimeStats delta;
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delta.wall = now.wall - this->start_time_.wall;
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delta.user = now.user - this->start_time_.user;
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delta.sys = now.sys - this->start_time_.sys;
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return delta;
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}
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// Return the stats for pass N (0 <= N <= 2).
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Timer::TimeStats
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Timer::get_pass_time(int n)
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{
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gold_assert(n >= 0 && n <= 2);
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TimeStats thispass = this->pass_times_[n];
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TimeStats& lastpass = n > 0 ? this->pass_times_[n-1] : this->start_time_;
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thispass.wall -= lastpass.wall;
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thispass.user -= lastpass.user;
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thispass.sys -= lastpass.sys;
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return thispass;
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}
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}
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