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  1. /*
  2.  * Copyright (c) 2005, HervĂ© Drolon, FreeImage Team
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  * 1. Redistributions of source code must retain the above copyright
  9.  *    notice, this list of conditions and the following disclaimer.
  10.  * 2. Redistributions in binary form must reproduce the above copyright
  11.  *    notice, this list of conditions and the following disclaimer in the
  12.  *    documentation and/or other materials provided with the distribution.
  13.  *
  14.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
  15.  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  18.  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  19.  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  20.  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  21.  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  22.  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  23.  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  24.  * POSSIBILITY OF SUCH DAMAGE.
  25.  */
  26.  
  27. #ifdef _WIN32
  28. #include <windows.h>
  29. #else
  30. #include <sys/time.h>
  31. #include <sys/resource.h>
  32. #include <sys/times.h>
  33. #endif /* _WIN32 */
  34. #include "opj_includes.h"
  35.  
  36. double opj_clock(void) {
  37. #ifdef _WIN32
  38.         /* _WIN32: use QueryPerformance (very accurate) */
  39.     LARGE_INTEGER freq , t ;
  40.     /* freq is the clock speed of the CPU */
  41.     QueryPerformanceFrequency(&freq) ;
  42.         /* cout << "freq = " << ((double) freq.QuadPart) << endl; */
  43.     /* t is the high resolution performance counter (see MSDN) */
  44.     QueryPerformanceCounter ( & t ) ;
  45.     return ( t.QuadPart /(double) freq.QuadPart ) ;
  46. #else
  47.         /* Unix or Linux: use resource usage */
  48.     struct rusage t;
  49.     double procTime;
  50.     /* (1) Get the rusage data structure at this moment (man getrusage) */
  51.     getrusage(0,&t);
  52.     /* (2) What is the elapsed time ? - CPU time = User time + System time */
  53.         /* (2a) Get the seconds */
  54.     procTime = t.ru_utime.tv_sec + t.ru_stime.tv_sec;
  55.     /* (2b) More precisely! Get the microseconds part ! */
  56.     return ( procTime + (t.ru_utime.tv_usec + t.ru_stime.tv_usec) * 1e-6 ) ;
  57. #endif
  58. }
  59.  
  60.