/mingw-w64-v2.0.999/binutils/src/gold/timer.cc
C++ | 131 lines | 86 code | 20 blank | 25 comment | 3 complexity | 019abe953dddc7173a3dc270bce2b58a MD5 | raw file
Possible License(s): LGPL-2.1, LGPL-3.0, 0BSD, LGPL-2.0, GPL-3.0, AGPL-1.0, Unlicense, GPL-2.0, BSD-3-Clause
- // timer.cc -- helper class for time accounting
- // Copyright 2009, 2010 Free Software Foundation, Inc.
- // Written by Rafael Avila de Espindola <espindola@google.com>.
- // This file is part of gold.
- // This program is free software; you can redistribute it and/or modify
- // it under the terms of the GNU General Public License as published by
- // the Free Software Foundation; either version 3 of the License, or
- // (at your option) any later version.
- // This program is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU General Public License for more details.
- // You should have received a copy of the GNU General Public License
- // along with this program; if not, write to the Free Software
- // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
- // MA 02110-1301, USA.
- #include "gold.h"
- #ifdef HAVE_TIMES
- #include <sys/times.h>
- #endif
- #include "libiberty.h"
- #include "timer.h"
- namespace gold
- {
- // Class Timer
- Timer::Timer()
- {
- this->start_time_.wall = 0;
- this->start_time_.user = 0;
- this->start_time_.sys = 0;
- }
- // Start counting the time.
- void
- Timer::start()
- {
- this->get_time(&this->start_time_);
- }
- // Record the time used by pass N (0 <= N <= 2).
- void
- Timer::stamp(int n)
- {
- gold_assert(n >= 0 && n <= 2);
- TimeStats& thispass = this->pass_times_[n];
- this->get_time(&thispass);
- }
- #if HAVE_SYSCONF && defined _SC_CLK_TCK
- # define TICKS_PER_SECOND sysconf (_SC_CLK_TCK) /* POSIX 1003.1-1996 */
- #else
- # ifdef CLK_TCK
- # define TICKS_PER_SECOND CLK_TCK /* POSIX 1003.1-1988; obsolescent */
- # else
- # ifdef HZ
- # define TICKS_PER_SECOND HZ /* traditional UNIX */
- # else
- # define TICKS_PER_SECOND 100 /* often the correct value */
- # endif
- # endif
- #endif
- // times returns statistics in clock_t units. This variable will hold the
- // conversion factor to seconds. We use a variable that is initialized once
- // because sysconf can be slow.
- static long ticks_per_sec;
- class Timer_init
- {
- public:
- Timer_init()
- {
- ticks_per_sec = TICKS_PER_SECOND;
- }
- };
- Timer_init timer_init;
- // Write the current time information.
- void
- Timer::get_time(TimeStats *now)
- {
- #ifdef HAVE_TIMES
- tms t;
- now->wall = (times(&t) * 1000) / ticks_per_sec;
- now->user = (t.tms_utime * 1000) / ticks_per_sec;
- now->sys = (t.tms_stime * 1000) / ticks_per_sec;
- #else
- now->wall = get_run_time() / 1000;
- now->user = 0;
- now->sys = 0;
- #endif
- }
- // Return the stats since start was called.
- Timer::TimeStats
- Timer::get_elapsed_time()
- {
- TimeStats now;
- this->get_time(&now);
- TimeStats delta;
- delta.wall = now.wall - this->start_time_.wall;
- delta.user = now.user - this->start_time_.user;
- delta.sys = now.sys - this->start_time_.sys;
- return delta;
- }
- // Return the stats for pass N (0 <= N <= 2).
- Timer::TimeStats
- Timer::get_pass_time(int n)
- {
- gold_assert(n >= 0 && n <= 2);
- TimeStats thispass = this->pass_times_[n];
- TimeStats& lastpass = n > 0 ? this->pass_times_[n-1] : this->start_time_;
- thispass.wall -= lastpass.wall;
- thispass.user -= lastpass.user;
- thispass.sys -= lastpass.sys;
- return thispass;
- }
- }