libGizmod/CPUUsage.hpp

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/*
  
  Copyright (c) 2007, Tim Burrell
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at 

        http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and 
  limitations under the License. 
  
*/

#ifndef __CPUUsage_h
#define __CPUUsage_h

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include "../libH/Average.hpp"
#include <vector>
#include <boost/shared_ptr.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>

// Namespace

namespace Gizmod {

// Typedefs / enums

typedef enum {
        CPUUSAGE_USER           = 0,
        CPUUSAGE_NICE           = 1,
        CPUUSAGE_SYSTEM         = 2,
        CPUUSAGE_IDLE           = 3,
        CPUUSAGE_IOWAIT         = 4,
        CPUUSAGE_IRQ            = 5,
        CPUUSAGE_SOFTIRQ        = 6,
        CPUUSAGE_RESERVED       = 7,
        CPUUSAGE_MAX 
} ProcStatField;

// CPUUsageInfo Class Definition

class CPUUsageInfo {
friend class CPUUsage;
public:
        // public member variables
        double                          Field[CPUUSAGE_MAX];            
        double                          Stat[CPUUSAGE_MAX];             
        double                          Usage;                          
        double                          Average;                        
        
        // construction / deconstruction
        CPUUsageInfo();                                                 
        virtual ~CPUUsageInfo();                                        
        
private:
        // private member variables
        H::Average                      mAverager;                      
        
private:
        // serialization
        friend class boost::serialization::access;
        template<class Archive>
        void serialize(Archive & ar, const unsigned int version) {
                ar & Field;
                ar & Stat;
                ar & Usage;
                ar & Average;
        }
};

// CPUUsage Class Definition

class CPUUsage {
public:
        // public functions
        size_t                          getNumCPUs();                   
        void                            init();                         
        virtual void                    onCPUUsage(std::vector< boost::shared_ptr<CPUUsageInfo> > const & Event); 
        void                            setTimeBetweenUpdates(float Seconds); 
        void                            shutdown();                     

        // construction / deconstruction
        CPUUsage();                                                     
        virtual ~CPUUsage();                                            

private:
        // private functions
        void                            threadProc();                   
        void                            updateUsageStats();             
        
        // private member variables
        float                           mSecsBetweenUpdates;            
        bool                            mWatching;                      
        std::vector< boost::shared_ptr<CPUUsageInfo> > mCPUUsage;       
        
        struct CPUUsageThreadProc {
                CPUUsageThreadProc(CPUUsage * pCPUUsage) : mpCPUUsage(pCPUUsage) {
                        mpCPUUsage->mThreading = false;
                };
                
                void operator()() {
                        mpCPUUsage->mThreading = true;
                        mpCPUUsage->threadProc();
                        mpCPUUsage->mThreading = false;
                }
                
                CPUUsage *              mpCPUUsage;                     
        };              
        bool                            mThreading;                     
        CPUUsageThreadProc              mThreadProc;                    
};


} // Gizmod namespace

#endif // __CPUUsage_h

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