base/sys_info.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/sys_info.h"
   6
   7 #include "base/time.h"
   8
   9 namespace base {
  10
  11 // static
  12 int64 SysInfo::Uptime() {
  13   // This code relies on an implementation detail of TimeTicks::Now() - that
  14   // its return value happens to coincide with the system uptime value in
  15   // microseconds, on Win/Mac/iOS/Linux/ChromeOS and Android.
  16   int64 uptime_in_microseconds = TimeTicks::Now().ToInternalValue();
  17   return uptime_in_microseconds / 1000;
  18 }
  19
  20 }  // namespace base