1 /*
2  * The copyright in this software is being made available under the 2-clauses
3  * BSD License, included below. This software may be subject to other third
4  * party and contributor rights, including patent rights, and no such rights
5  * are granted under this license.
6  *
7  * Copyright (c) 2005, Herve Drolon, FreeImage Team
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include "opj_includes.h"
33 
34 #ifdef _WIN32
35 #include <windows.h>
36 #else
37 #include <sys/time.h>
38 #include <sys/resource.h>
39 #include <sys/times.h>
40 #endif /* _WIN32 */
41 
42 OPJ_FLOAT64 opj_clock(void)
43 {
44 #ifdef _WIN32
45     /* _WIN32: use QueryPerformance (very accurate) */
46     LARGE_INTEGER freq, t ;
47     /* freq is the clock speed of the CPU */
48     QueryPerformanceFrequency(&freq) ;
49     /* cout << "freq = " << ((double) freq.QuadPart) << endl; */
50     /* t is the high resolution performance counter (see MSDN) */
51     QueryPerformanceCounter(& t) ;
52     return ((OPJ_FLOAT64) t.QuadPart / (OPJ_FLOAT64) freq.QuadPart) ;
53 #else
54     /* Unix or Linux: use resource usage */
55     struct rusage t;
56     OPJ_FLOAT64 procTime;
57     /* (1) Get the rusage data structure at this moment (man getrusage) */
58     getrusage(0, &t);
59     /* (2) What is the elapsed time ? - CPU time = User time + System time */
60     /* (2a) Get the seconds */
61     procTime = (OPJ_FLOAT64)(t.ru_utime.tv_sec + t.ru_stime.tv_sec);
62     /* (2b) More precisely! Get the microseconds part ! */
63     return (procTime + (OPJ_FLOAT64)(t.ru_utime.tv_usec + t.ru_stime.tv_usec) *
64             1e-6) ;
65 #endif
66 }
67 
68