cannam@127: /*
cannam@127:  * Copyright (c) 2001 Matteo Frigo
cannam@127:  * Copyright (c) 2001 Massachusetts Institute of Technology
cannam@127:  *
cannam@127:  * This program is free software; you can redistribute it and/or modify
cannam@127:  * it under the terms of the GNU General Public License as published by
cannam@127:  * the Free Software Foundation; either version 2 of the License, or
cannam@127:  * (at your option) any later version.
cannam@127:  *
cannam@127:  * This program is distributed in the hope that it will be useful,
cannam@127:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@127:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
cannam@127:  * GNU General Public License for more details.
cannam@127:  *
cannam@127:  * You should have received a copy of the GNU General Public License
cannam@127:  * along with this program; if not, write to the Free Software
cannam@127:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
cannam@127:  *
cannam@127:  */
cannam@127: 
cannam@127: 
cannam@127: #include "bench.h"
cannam@127: #include <stdio.h>
cannam@127: 
cannam@127: /* 
cannam@127:  * System-dependent timing functions:
cannam@127:  */
cannam@127: #ifdef HAVE_SYS_TIME_H
cannam@127: #include <sys/time.h>
cannam@127: #endif
cannam@127: 
cannam@127: #ifdef HAVE_UNISTD_H
cannam@127: #include <unistd.h>
cannam@127: #endif
cannam@127: 
cannam@127: #ifdef HAVE_BSDGETTIMEOFDAY
cannam@127: #ifndef HAVE_GETTIMEOFDAY
cannam@127: #define gettimeofday BSDgettimeofday
cannam@127: #define HAVE_GETTIMEOFDAY 1
cannam@127: #endif
cannam@127: #endif
cannam@127: 
cannam@127: double time_min;
cannam@127: int time_repeat;
cannam@127: 
cannam@127: #if !defined(HAVE_TIMER) && (defined(__WIN32__) || defined(_WIN32) || defined(_WINDOWS) || defined(__CYGWIN__))
cannam@127: #include <windows.h>
cannam@127: typedef LARGE_INTEGER mytime;
cannam@127: 
cannam@127: static mytime get_time(void)
cannam@127: {
cannam@127:      mytime tv;
cannam@127:      QueryPerformanceCounter(&tv);
cannam@127:      return tv;
cannam@127: }
cannam@127: 
cannam@127: static double elapsed(mytime t1, mytime t0)
cannam@127: {
cannam@127:      LARGE_INTEGER freq;
cannam@127:      QueryPerformanceFrequency(&freq);
cannam@127:      return (((double) t1.QuadPart - (double) t0.QuadPart)) /
cannam@127: 	  ((double) freq.QuadPart);
cannam@127: }
cannam@127: 
cannam@127: #define HAVE_TIMER
cannam@127: #endif
cannam@127: 
cannam@127: 
cannam@127: #if defined(HAVE_GETTIMEOFDAY) && !defined(HAVE_TIMER)
cannam@127: typedef struct timeval mytime;
cannam@127: 
cannam@127: static mytime get_time(void)
cannam@127: {
cannam@127:      struct timeval tv;
cannam@127:      gettimeofday(&tv, 0);
cannam@127:      return tv;
cannam@127: }
cannam@127: 
cannam@127: static double elapsed(mytime t1, mytime t0)
cannam@127: {
cannam@127:      return ((double) t1.tv_sec - (double) t0.tv_sec) +
cannam@127: 	  ((double) t1.tv_usec - (double) t0.tv_usec) * 1.0E-6;
cannam@127: }
cannam@127: 
cannam@127: #define HAVE_TIMER
cannam@127: #endif
cannam@127: 
cannam@127: #ifndef HAVE_TIMER
cannam@127: #error "timer not defined"
cannam@127: #endif
cannam@127: 
cannam@127: static double calibrate(void)
cannam@127: {
cannam@127:      /* there seems to be no reasonable way to calibrate the
cannam@127: 	clock automatically any longer.  Grrr... */
cannam@127: 
cannam@127:      return 0.01;
cannam@127: }
cannam@127: 
cannam@127: 
cannam@127: void timer_init(double tmin, int repeat)
cannam@127: {
cannam@127:      static int inited = 0;
cannam@127: 
cannam@127:      if (inited)
cannam@127: 	  return;
cannam@127:      inited = 1;
cannam@127: 
cannam@127:      if (!repeat)
cannam@127: 	  repeat = 8;
cannam@127:      time_repeat = repeat;
cannam@127: 
cannam@127:      if (tmin > 0)
cannam@127: 	  time_min = tmin;
cannam@127:      else
cannam@127: 	  time_min = calibrate();
cannam@127: }
cannam@127: 
cannam@127: static mytime t0[BENCH_NTIMERS];
cannam@127: 
cannam@127: void timer_start(int n)
cannam@127: {
cannam@127:      BENCH_ASSERT(n >= 0 && n < BENCH_NTIMERS);
cannam@127:      t0[n] = get_time();
cannam@127: }
cannam@127: 
cannam@127: double timer_stop(int n)
cannam@127: {
cannam@127:      mytime t1;
cannam@127:      BENCH_ASSERT(n >= 0 && n < BENCH_NTIMERS);
cannam@127:      t1 = get_time();
cannam@127:      return elapsed(t1, t0[n]);
cannam@127: }
cannam@127: