Chris@82: /*
Chris@82:  * Copyright (c) 2001 Matteo Frigo
Chris@82:  * Copyright (c) 2001 Massachusetts Institute of Technology
Chris@82:  *
Chris@82:  * This program is free software; you can redistribute it and/or modify
Chris@82:  * it under the terms of the GNU General Public License as published by
Chris@82:  * the Free Software Foundation; either version 2 of the License, or
Chris@82:  * (at your option) any later version.
Chris@82:  *
Chris@82:  * This program is distributed in the hope that it will be useful,
Chris@82:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@82:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@82:  * GNU General Public License for more details.
Chris@82:  *
Chris@82:  * You should have received a copy of the GNU General Public License
Chris@82:  * along with this program; if not, write to the Free Software
Chris@82:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
Chris@82:  *
Chris@82:  */
Chris@82: 
Chris@82: 
Chris@82: #include "libbench2/bench.h"
Chris@82: #include <stdio.h>
Chris@82: 
Chris@82: /* 
Chris@82:  * System-dependent timing functions:
Chris@82:  */
Chris@82: #ifdef HAVE_SYS_TIME_H
Chris@82: #include <sys/time.h>
Chris@82: #endif
Chris@82: 
Chris@82: #ifdef HAVE_UNISTD_H
Chris@82: #include <unistd.h>
Chris@82: #endif
Chris@82: 
Chris@82: #ifdef HAVE_BSDGETTIMEOFDAY
Chris@82: #ifndef HAVE_GETTIMEOFDAY
Chris@82: #define gettimeofday BSDgettimeofday
Chris@82: #define HAVE_GETTIMEOFDAY 1
Chris@82: #endif
Chris@82: #endif
Chris@82: 
Chris@82: double time_min;
Chris@82: int time_repeat;
Chris@82: 
Chris@82: #if !defined(HAVE_TIMER) && (defined(__WIN32__) || defined(_WIN32) || defined(_WINDOWS) || defined(__CYGWIN__))
Chris@82: #include <windows.h>
Chris@82: typedef LARGE_INTEGER mytime;
Chris@82: 
Chris@82: static mytime get_time(void)
Chris@82: {
Chris@82:      mytime tv;
Chris@82:      QueryPerformanceCounter(&tv);
Chris@82:      return tv;
Chris@82: }
Chris@82: 
Chris@82: static double elapsed(mytime t1, mytime t0)
Chris@82: {
Chris@82:      LARGE_INTEGER freq;
Chris@82:      QueryPerformanceFrequency(&freq);
Chris@82:      return (((double) t1.QuadPart - (double) t0.QuadPart)) /
Chris@82: 	  ((double) freq.QuadPart);
Chris@82: }
Chris@82: 
Chris@82: #define HAVE_TIMER
Chris@82: #endif
Chris@82: 
Chris@82: 
Chris@82: #if defined(HAVE_GETTIMEOFDAY) && !defined(HAVE_TIMER)
Chris@82: typedef struct timeval mytime;
Chris@82: 
Chris@82: static mytime get_time(void)
Chris@82: {
Chris@82:      struct timeval tv;
Chris@82:      gettimeofday(&tv, 0);
Chris@82:      return tv;
Chris@82: }
Chris@82: 
Chris@82: static double elapsed(mytime t1, mytime t0)
Chris@82: {
Chris@82:      return ((double) t1.tv_sec - (double) t0.tv_sec) +
Chris@82: 	  ((double) t1.tv_usec - (double) t0.tv_usec) * 1.0E-6;
Chris@82: }
Chris@82: 
Chris@82: #define HAVE_TIMER
Chris@82: #endif
Chris@82: 
Chris@82: #ifndef HAVE_TIMER
Chris@82: #error "timer not defined"
Chris@82: #endif
Chris@82: 
Chris@82: static double calibrate(void)
Chris@82: {
Chris@82:      /* there seems to be no reasonable way to calibrate the
Chris@82: 	clock automatically any longer.  Grrr... */
Chris@82: 
Chris@82:      return 0.01;
Chris@82: }
Chris@82: 
Chris@82: 
Chris@82: void timer_init(double tmin, int repeat)
Chris@82: {
Chris@82:      static int inited = 0;
Chris@82: 
Chris@82:      if (inited)
Chris@82: 	  return;
Chris@82:      inited = 1;
Chris@82: 
Chris@82:      if (!repeat)
Chris@82: 	  repeat = 8;
Chris@82:      time_repeat = repeat;
Chris@82: 
Chris@82:      if (tmin > 0)
Chris@82: 	  time_min = tmin;
Chris@82:      else
Chris@82: 	  time_min = calibrate();
Chris@82: }
Chris@82: 
Chris@82: static mytime t0[BENCH_NTIMERS];
Chris@82: 
Chris@82: void timer_start(int n)
Chris@82: {
Chris@82:      BENCH_ASSERT(n >= 0 && n < BENCH_NTIMERS);
Chris@82:      t0[n] = get_time();
Chris@82: }
Chris@82: 
Chris@82: double timer_stop(int n)
Chris@82: {
Chris@82:      mytime t1;
Chris@82:      BENCH_ASSERT(n >= 0 && n < BENCH_NTIMERS);
Chris@82:      t1 = get_time();
Chris@82:      return elapsed(t1, t0[n]);
Chris@82: }
Chris@82: