87 lines
1.6 KiB
C++
87 lines
1.6 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#if defined USE_POSIX_TIME
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#include <time.h>
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#elif defined __MACH__
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#include <mach/mach_time.h>
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#else
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#include <chrono>
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#endif
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#ifdef USE_POSIX_TIME
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namespace {
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const double NANOSECONDS_IN_A_SECOND = 1000000000;
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} // namespace
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#endif
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#ifdef __MACH__
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namespace {
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inline double getConversionFactor()
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{
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double conversionFactor;
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mach_timebase_info_data_t info;
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mach_timebase_info(&info);
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conversionFactor = static_cast<double>(info.numer) / info.denom;
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return conversionFactor;
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}
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} // namespace
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#endif
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namespace facebook::react {
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#if defined USE_POSIX_TIME
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inline double getCPUTimeNanos()
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{
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struct timespec time{};
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &time);
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return static_cast<double>(time.tv_sec) * NANOSECONDS_IN_A_SECOND + static_cast<double>(time.tv_nsec);
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}
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inline bool hasAccurateCPUTimeNanosForBenchmarks()
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{
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return true;
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}
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#elif defined __MACH__
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inline double getCPUTimeNanos()
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{
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static auto conversionFactor = getConversionFactor();
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uint64_t time = mach_absolute_time();
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return static_cast<double>(time) * conversionFactor;
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}
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inline bool hasAccurateCPUTimeNanosForBenchmarks()
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{
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return true;
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}
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#else
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inline double getCPUTimeNanos()
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{
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auto now = std::chrono::steady_clock::now();
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return static_cast<double>(std::chrono::duration_cast<std::chrono::nanoseconds>(now.time_since_epoch()).count());
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}
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inline bool hasAccurateCPUTimeNanosForBenchmarks()
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{
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return false;
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}
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#endif
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} // namespace facebook::react
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