mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
2690e7363c
Summary: Now the function supports iOS. We will use it soon. Changelog: [Internal] Fabric-specific internal change. Reviewed By: mdvacca Differential Revision: D18285828 fbshipit-source-id: b9c16433e9c75ab4c071e4bd55074757372f6c0a
75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its 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(__unix__) || (defined(__APPLE__) && defined(__MACH__))
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// It's Unix
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#include <time.h>
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#include <unistd.h>
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#endif
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#if defined(__APPLE__) && defined(__MACH__)
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// It's iOS or macOS or one of derivatives.
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#include <dispatch/dispatch.h>
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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#endif
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namespace facebook {
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namespace react {
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inline static int64_t monotonicTimeInMilliseconds() {
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#if defined(__APPLE__) && defined(__MACH__)
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static struct mach_timebase_info tb_info = {0};
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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__unused int ret = mach_timebase_info(&tb_info);
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assert(0 == ret);
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});
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return (mach_absolute_time() * tb_info.numer) / tb_info.denom / 1000000;
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#elif defined(_POSIX_MONOTONIC_CLOCK)
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// It's Unix with MONOTONIC_CLOCK support (e.g. Android)
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constexpr static int64_t NANOSECONDS_IN_SECOND = 1000000000LL;
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constexpr static int64_t NANOSECONDS_IN_MILLISECOND = 1000000LL;
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// Since SystemClock.uptimeMillis() is commonly used for performance
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// measurement in Java and uptimeMillis() internally uses
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// clock_gettime(CLOCK_MONOTONIC), we use the same API here. We need that to
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// make sure we use the same time system on both JS and Java sides. Links to
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// the source code:
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// https://android.googlesource.com/platform/frameworks/native/+/jb-mr1-release/libs/utils/SystemClock.cpp
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// https://android.googlesource.com/platform/system/core/+/master/libutils/Timers.cpp
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struct timespec now;
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clock_gettime(CLOCK_MONOTONIC, &now);
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return (now.tv_sec * NANOSECONDS_IN_SECOND + now.tv_nsec) /
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NANOSECONDS_IN_MILLISECOND;
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#else
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It's Unix *without* MONOTONIC_CLOCK support or Microsoft Windows.
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If you run this on Microsoft Windows, could you please implement the
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function using some Windows-specific APIs, and submit a PR?
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https://stackoverflow.com/questions/5404277/porting-clock-gettime-to-windows
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#endif
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}
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} // namespace react
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} // namespace facebook
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