diff options
Diffstat (limited to 'gold/timer.cc')
-rw-r--r-- | gold/timer.cc | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/gold/timer.cc b/gold/timer.cc new file mode 100644 index 0000000..ec51bc9 --- /dev/null +++ b/gold/timer.cc @@ -0,0 +1,107 @@ +// timer.cc -- helper class for time accounting + +// Copyright 2009 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" + +#include <sys/times.h> + +#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 couting the time. +void +Timer::start () +{ + this->get_time(&this->start_time_); +} + +#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 initialize 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 infortamion. +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; +} + +} |