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27 lines
1009 B
C++
27 lines
1009 B
C++
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// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/time/time.h"
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namespace base {
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// static
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TimeTicks TimeTicks::FromUptimeMillis(jlong uptime_millis_value) {
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// The implementation of the SystemClock.uptimeMillis() in AOSP uses the same
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// clock as base::TimeTicks::Now(): clock_gettime(CLOCK_MONOTONIC), see in
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// platform/system/code:
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// 1. libutils/SystemClock.cpp
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// 2. libutils/Timers.cpp
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//
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// We are not aware of any motivations for Android OEMs to modify the AOSP
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// implementation of either uptimeMillis() or clock_gettime(CLOCK_MONOTONIC),
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// so we assume that there are no such customizations.
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//
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// Under these assumptions the conversion is as safe as copying the value of
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// base::TimeTicks::Now() with a loss of sub-millisecond precision.
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return TimeTicks(uptime_millis_value * Time::kMicrosecondsPerMillisecond);
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}
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} // namespace base
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