1 /*
2 * Copyright (c) 2005, Herve 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
opj_clock(void)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