74 lines
3.2 KiB
C++
74 lines
3.2 KiB
C++
/*
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* Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>
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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 APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE 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
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/CPUTime.h>
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#include <windows.h>
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namespace WTF {
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static Seconds fileTimeToSeconds(const FILETIME& fileTime)
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{
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// https://msdn.microsoft.com/ja-jp/library/windows/desktop/ms683223(v=vs.85).aspx
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// "All times are expressed using FILETIME data structures. Such a structure contains
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// two 32-bit values that combine to form a 64-bit count of 100-nanosecond time units."
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const constexpr double hundredsOfNanosecondsPerSecond = (1000.0 * 1000.0 * 1000.0) / 100.0;
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// https://msdn.microsoft.com/ja-jp/library/windows/desktop/ms724284(v=vs.85).aspx
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// "It is not recommended that you add and subtract values from the FILETIME structure to obtain relative times.
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// Instead, you should copy the low- and high-order parts of the file time to a ULARGE_INTEGER structure,
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// perform 64-bit arithmetic on the QuadPart member, and copy the LowPart and HighPart members into the FILETIME structure."
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ULARGE_INTEGER durationIn100NS;
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memcpy(&durationIn100NS, &fileTime, sizeof(durationIn100NS));
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return Seconds { durationIn100NS.QuadPart / hundredsOfNanosecondsPerSecond };
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}
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std::optional<CPUTime> CPUTime::get()
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{
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// https://msdn.microsoft.com/ja-jp/library/windows/desktop/ms683223(v=vs.85).aspx
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FILETIME creationTime;
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FILETIME exitTime;
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FILETIME kernelTime;
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FILETIME userTime;
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if (!::GetProcessTimes(::GetCurrentProcess(), &creationTime, &exitTime, &kernelTime, &userTime))
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return std::nullopt;
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return CPUTime { MonotonicTime::now(), fileTimeToSeconds(userTime), fileTimeToSeconds(kernelTime) };
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}
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Seconds CPUTime::forCurrentThread()
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{
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FILETIME userTime, kernelTime, creationTime, exitTime;
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BOOL ret = GetThreadTimes(GetCurrentThread(), &creationTime, &exitTime, &kernelTime, &userTime);
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RELEASE_ASSERT(ret);
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return fileTimeToSeconds(userTime) + fileTimeToSeconds(kernelTime);
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}
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}
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