/* * Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "CPUTime.h" #include <windows.h> namespace WTF { static Seconds fileTimeToSeconds(const FILETIME& fileTime) { // https://msdn.microsoft.com/ja-jp/library/windows/desktop/ms683223(v=vs.85).aspx // "All times are expressed using FILETIME data structures. Such a structure contains // two 32-bit values that combine to form a 64-bit count of 100-nanosecond time units." const constexpr double hundredsOfNanosecondsPerSecond = (1000.0 * 1000.0 * 1000.0) / 100.0; // https://msdn.microsoft.com/ja-jp/library/windows/desktop/ms724284(v=vs.85).aspx // "It is not recommended that you add and subtract values from the FILETIME structure to obtain relative times. // Instead, you should copy the low- and high-order parts of the file time to a ULARGE_INTEGER structure, // perform 64-bit arithmetic on the QuadPart member, and copy the LowPart and HighPart members into the FILETIME structure." ULARGE_INTEGER durationIn100NS; memcpy(&durationIn100NS, &fileTime, sizeof(durationIn100NS)); return Seconds { durationIn100NS.QuadPart / hundredsOfNanosecondsPerSecond }; } std::optional<CPUTime> CPUTime::get() { // https://msdn.microsoft.com/ja-jp/library/windows/desktop/ms683223(v=vs.85).aspx FILETIME creationTime; FILETIME exitTime; FILETIME kernelTime; FILETIME userTime; if (!::GetProcessTimes(::GetCurrentProcess(), &creationTime, &exitTime, &kernelTime, &userTime)) return std::nullopt; return CPUTime { MonotonicTime::now(), fileTimeToSeconds(userTime), fileTimeToSeconds(kernelTime) }; } }