blob: e0c4914afdf2bb33d07e70a676b26a021aae9a2f [file] [log] [blame]
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/time/time.h"
namespace base {
// static
TimeTicks TimeTicks::FromUptimeMillis(jlong uptime_millis_value) {
// The implementation of the SystemClock.uptimeMillis() in AOSP uses the same
// clock as base::TimeTicks::Now(): clock_gettime(CLOCK_MONOTONIC), see in
// platform/system/code:
// 1. libutils/SystemClock.cpp
// 2. libutils/Timers.cpp
// We are not aware of any motivations for Android OEMs to modify the AOSP
// implementation of either uptimeMillis() or clock_gettime(CLOCK_MONOTONIC),
// so we assume that there are no such customizations.
// Under these assumptions the conversion is as safe as copying the value of
// base::TimeTicks::Now() with a loss of sub-millisecond precision.
return TimeTicks(uptime_millis_value * Time::kMicrosecondsPerMillisecond);
} // namespace base