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 #ifdef _WIN32
33 #include <windows.h>
34 #else
35 #include <sys/time.h>
36 #include <sys/resource.h>
37 #include <sys/times.h>
38 #endif /* _WIN32 */
39 #include "opj_includes.h"
40
opj_clock(void)41 double OPJ_CALLCONV opj_clock(void)
42 {
43 #ifdef _WIN32
44 /* _WIN32: use QueryPerformance (very accurate) */
45 LARGE_INTEGER freq, t ;
46 /* freq is the clock speed of the CPU */
47 QueryPerformanceFrequency(&freq) ;
48 /* cout << "freq = " << ((double) freq.QuadPart) << endl; */
49 /* t is the high resolution performance counter (see MSDN) */
50 QueryPerformanceCounter(& t) ;
51 return (t.QuadPart / (double) freq.QuadPart) ;
52 #else
53 /* Unix or Linux: use resource usage */
54 struct rusage t;
55 double procTime;
56 /* (1) Get the rusage data structure at this moment (man getrusage) */
57 getrusage(0, &t);
58 /* (2) What is the elapsed time ? - CPU time = User time + System time */
59 /* (2a) Get the seconds */
60 procTime = t.ru_utime.tv_sec + t.ru_stime.tv_sec;
61 /* (2b) More precisely! Get the microseconds part ! */
62 return (procTime + (t.ru_utime.tv_usec + t.ru_stime.tv_usec) * 1e-6) ;
63 #endif
64 }
65
66