demos/spiv/cpu_timer.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2012 Cyril Hrubis <metan@ucw.cz>                       *
  20  *                                                                           *
  21  *****************************************************************************/
  22
  23 #include <stdio.h>
  24 #include "cpu_timer.h"
  25
  26 static void to_time(int *sec, int *nsec, struct timespec *start,
  27                     struct timespec *stop)
  28 {
  29         if (stop->tv_nsec < start->tv_nsec) {
  30                 *sec  = stop->tv_sec - start->tv_sec - 1;
  31                 *nsec = stop->tv_nsec + 1000000000 - start->tv_nsec;
  32         } else {
  33                 *sec  = stop->tv_sec  - start->tv_sec;
  34                 *nsec = stop->tv_nsec - start->tv_nsec;
  35         }
  36 }
  37
  38 static int timers_disabled = 1;
  39
  40 void cpu_timer_switch(int enable)
  41 {
  42         timers_disabled = !enable;
  43 }
  44
  45 void cpu_timer_start(struct cpu_timer *self, const char *name)
  46 {
  47         if (timers_disabled)
  48                 return;
  49
  50         self->name = name;
  51
  52         clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &self->t_cpu_start);
  53         clock_gettime(CLOCK_MONOTONIC, &self->t_real_start);
  54 }
  55
  56 void cpu_timer_stop(struct cpu_timer *self)
  57 {
  58         if (timers_disabled)
  59                 return;
  60
  61         clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &self->t_cpu_stop);
  62         clock_gettime(CLOCK_MONOTONIC, &self->t_real_stop);
  63
  64         int cpu_sec;
  65         int cpu_nsec;
  66
  67         int real_sec;
  68         int real_nsec;
  69
  70         to_time(&cpu_sec, &cpu_nsec, &self->t_cpu_start, &self->t_cpu_stop);
  71         to_time(&real_sec, &real_nsec, &self->t_real_start, &self->t_real_stop);
  72
  73         printf("TIMER '%s' CPU=%i.%09is REAL=%i.%09is\n", self->name,
  74                cpu_sec, cpu_nsec, real_sec, real_nsec);
  75 }