components/power_metrics/mach_time_mac.h

   1 // Copyright 2021 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_POWER_METRICS_MACH_TIME_MAC_H_
   6 #define COMPONENTS_POWER_METRICS_MACH_TIME_MAC_H_
   7
   8 #include <mach/mach_time.h>
   9 #include <stdint.h>
  10
  11 namespace power_metrics {
  12
  13 // Converts |mach_time| to nanoseconds, using the multiplier in |mach_timebase|.
  14 uint64_t MachTimeToNs(uint64_t mach_time,
  15                       const mach_timebase_info_data_t& mach_timebase);
  16
  17 // Retrieves the |mach_timebase| to convert |mach_time| obtained on this system
  18 // to nanoseconds.
  19 mach_timebase_info_data_t GetSystemMachTimeBase();
  20
  21 }  // namespace power_metrics
  22
  23 #endif  // COMPONENTS_POWER_METRICS_MACH_TIME_MAC_H_