135 lines
2.8 KiB
C
135 lines
2.8 KiB
C
/*
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* Copyright (c) 2001 Matteo Frigo
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* Copyright (c) 2001 Massachusetts Institute of Technology
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*
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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 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, MA 02110-1301 USA
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*
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*/
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#include "libbench2/bench.h"
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#include <stdio.h>
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/*
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* System-dependent timing functions:
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*/
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_BSDGETTIMEOFDAY
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#ifndef HAVE_GETTIMEOFDAY
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#define gettimeofday BSDgettimeofday
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#define HAVE_GETTIMEOFDAY 1
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#endif
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#endif
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double time_min;
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int time_repeat;
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#if !defined(HAVE_TIMER) && (defined(__WIN32__) || defined(_WIN32) || defined(_WINDOWS) || defined(__CYGWIN__))
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#include <windows.h>
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typedef LARGE_INTEGER mytime;
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static mytime get_time(void)
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{
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mytime tv;
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QueryPerformanceCounter(&tv);
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return tv;
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}
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static double elapsed(mytime t1, mytime t0)
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{
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LARGE_INTEGER freq;
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QueryPerformanceFrequency(&freq);
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return (((double) t1.QuadPart - (double) t0.QuadPart)) /
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((double) freq.QuadPart);
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}
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#define HAVE_TIMER
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#endif
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#if defined(HAVE_GETTIMEOFDAY) && !defined(HAVE_TIMER)
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typedef struct timeval mytime;
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static mytime get_time(void)
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{
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struct timeval tv;
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gettimeofday(&tv, 0);
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return tv;
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}
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static double elapsed(mytime t1, mytime t0)
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{
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return ((double) t1.tv_sec - (double) t0.tv_sec) +
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((double) t1.tv_usec - (double) t0.tv_usec) * 1.0E-6;
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}
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#define HAVE_TIMER
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#endif
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#ifndef HAVE_TIMER
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#error "timer not defined"
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#endif
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static double calibrate(void)
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{
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/* there seems to be no reasonable way to calibrate the
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clock automatically any longer. Grrr... */
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return 0.01;
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}
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void timer_init(double tmin, int repeat)
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{
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static int inited = 0;
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if (inited)
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return;
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inited = 1;
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if (!repeat)
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repeat = 8;
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time_repeat = repeat;
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if (tmin > 0)
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time_min = tmin;
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else
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time_min = calibrate();
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}
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static mytime t0[BENCH_NTIMERS];
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void timer_start(int n)
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{
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BENCH_ASSERT(n >= 0 && n < BENCH_NTIMERS);
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t0[n] = get_time();
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}
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double timer_stop(int n)
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{
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mytime t1;
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BENCH_ASSERT(n >= 0 && n < BENCH_NTIMERS);
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t1 = get_time();
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return elapsed(t1, t0[n]);
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}
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