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
