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68 lines
2.7 KiB
C
68 lines
2.7 KiB
C
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/*
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* The copyright in this software is being made available under the 2-clauses
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* BSD License, included below. This software may be subject to other third
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* party and contributor rights, including patent rights, and no such rights
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* are granted under this license.
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*
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* Copyright (c) 2005, Herve Drolon, FreeImage Team
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opj_includes.h"
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/times.h>
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#endif /* _WIN32 */
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OPJ_FLOAT64 opj_clock(void)
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{
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#ifdef _WIN32
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/* _WIN32: use QueryPerformance (very accurate) */
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LARGE_INTEGER freq, t ;
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/* freq is the clock speed of the CPU */
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QueryPerformanceFrequency(&freq) ;
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/* cout << "freq = " << ((double) freq.QuadPart) << endl; */
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/* t is the high resolution performance counter (see MSDN) */
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QueryPerformanceCounter(& t) ;
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return ((OPJ_FLOAT64) t.QuadPart / (OPJ_FLOAT64) freq.QuadPart) ;
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#else
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/* Unix or Linux: use resource usage */
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struct rusage t;
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OPJ_FLOAT64 procTime;
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/* (1) Get the rusage data structure at this moment (man getrusage) */
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getrusage(0, &t);
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/* (2) What is the elapsed time ? - CPU time = User time + System time */
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/* (2a) Get the seconds */
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procTime = (OPJ_FLOAT64)(t.ru_utime.tv_sec + t.ru_stime.tv_sec);
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/* (2b) More precisely! Get the microseconds part ! */
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return (procTime + (OPJ_FLOAT64)(t.ru_utime.tv_usec + t.ru_stime.tv_usec) *
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1e-6) ;
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#endif
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}
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