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      1 /*
      2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #ifndef SRC_SYSTEM_WRAPPERS_SOURCE_CPU_MEASUREMENT_HARNESS_H_
     12 #define SRC_SYSTEM_WRAPPERS_SOURCE_CPU_MEASUREMENT_HARNESS_H_
     13 
     14 #include "system_wrappers/interface/scoped_ptr.h"
     15 
     16 namespace webrtc {
     17 
     18 class CpuWrapper;
     19 class EventWrapper;
     20 class ThreadWrapper;
     21 
     22 // This abstract class provides an interface that should be passed to
     23 // CpuMeasurementHarness. CpuMeasurementHarness will call it with the
     24 // frequency requested and measure the CPU usage for all calls.
     25 class CpuTarget {
     26  public:
     27   // Callback function for which the CPU usage should be calculated.
     28   virtual bool DoWork() = 0;
     29 
     30  protected:
     31   CpuTarget() {}
     32   virtual ~CpuTarget() {}
     33 };
     34 
     35 class CpuMeasurementHarness {
     36  public:
     37   static CpuMeasurementHarness* Create(CpuTarget* target,
     38                                        int work_period_ms,
     39                                        int work_iterations_per_period,
     40                                        int duration_ms);
     41   ~CpuMeasurementHarness();
     42   bool Run();
     43   int AverageCpu();
     44 
     45  protected:
     46   CpuMeasurementHarness(CpuTarget* target, int work_period_ms,
     47                         int work_iterations_per_period, int duration_ms);
     48 
     49  private:
     50   bool WaitForCpuInit();
     51   void Measure();
     52   bool DoWork();
     53 
     54   CpuTarget* cpu_target_;
     55   const int work_period_ms_;
     56   const int work_iterations_per_period_;
     57   const int duration_ms_;
     58   int cpu_sum_;
     59   int cpu_iterations_;
     60   scoped_ptr<CpuWrapper> cpu_;
     61   scoped_ptr<EventWrapper> event_;
     62 };
     63 
     64 }  // namespace webrtc
     65 
     66 #endif  // SRC_SYSTEM_WRAPPERS_SOURCE_CPU_MEASUREMENT_HARNESS_H_
     67