IdleWakeups tool

tools/win/IdleWakeups/power_sampler.h

+// Copyright 2016 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.
+
+#ifndef TOOLS_WIN_IDLEWAKEUPS_POWER_STATUS_MONITOR_H_
+#define TOOLS_WIN_IDLEWAKEUPS_POWER_STATUS_MONITOR_H_
+
+#include <map>
+#include <string>
+
+#include <windows.h>
+
+// https://software.intel.com/en-us/blogs/2012/12/13/using-the-intel-power-gadget-api-on-mac-os-x
+typedef int (*IntelEnergyLibInitialize_t)();
+typedef int (*GetNumMsrs_t)(int* nMsr);
+typedef int (*GetMsrName_t)(int iMsr, wchar_t* szName);
+typedef int (*GetMsrFunc_t)(int iMsr, int* pFuncID);
+typedef int (*GetPowerData_t)(int iNode,
+                              int iMsr,
+                              double* pResult,
+                              int* nResult);
+typedef int (*ReadSample_t)();
+
+class PowerSampler {
+ public:
+  PowerSampler();
+  ~PowerSampler();
+
+  void SampleCPUPowerState();
+
+  double get_power(std::wstring key) { return power_[key]; }
+
+ private:
+  // Power consumed in mWh since the last sample.
+  std::map<std::wstring, double> power_;
+
+  HMODULE energy_lib_ = nullptr;
+  IntelEnergyLibInitialize_t IntelEnergyLibInitialize = nullptr;
+  GetNumMsrs_t GetNumMsrs = nullptr;
+  GetMsrName_t GetMsrName = nullptr;
+  GetMsrFunc_t GetMsrFunc = nullptr;
+  GetPowerData_t GetPowerData = nullptr;
+  ReadSample_t ReadSample = nullptr;
+
+  PowerSampler& operator=(const PowerSampler&) = delete;
+  PowerSampler(const PowerSampler&) = delete;
+};
+
+#endif  // TOOLS_WIN_IDLEWAKEUPS_POWER_STATUS_MONITOR_H_