gamultithreadingalgorithm.h

来自「遗传算法做的排课系统」· C头文件 代码 · 共 140 行

#ifndef __GA_MULTITHREADING_ALGORITHM_H__
#define __GA_MULTITHREADING_ALGORITHM_H__

#include "..\CallConvention.h"
#include "GaAlgorithm.h"

namespace Algorithm
{
	// Prameters for multithreading genetic algorithm
	class GaMultithreadingAlgorithmParams : public GaAlgorithmParams
	{

	private:

		// Number of workers thread
		int _numberOfWorkers;

	public:

		// Initialize parameters
		DLL_EXPORT
		GaMultithreadingAlgorithmParams(int numberOfWorkers);

		// Initialize parameters with default values
		DLL_EXPORT
		GaMultithreadingAlgorithmParams();

		// Virtual copy constructor
		DLL_EXPORT
		virtual GaParameters* GACALL Clone() const;

		// Returns number of workers thread
		DLL_EXPORT
		int GACALL GetNumberOfWorkers() const;

		// Sets number of workers thread
		DLL_EXPORT
		void GACALL SetNumberOfWorkers(int workers);

	};// END CLASS DEFINITION GaMultithreadingAlgorithmParams

	// Base class for mutlithreaded algorithms
	class GaMultithreadingAlgorithm : public GaBaseAlgorithm
	{

	protected:

		// Synchronization of worker's thread
		SysSemaphoreObject _workerSync[2];

		// If set to true indicates that parameter change is in progress
		bool _parametersChange;

		// Number of threads
		int _numberOfThreads;

		// ID counter for worker threads
		volatile int _workerIdCounter;

		// Control thread and workers
		GaThread** _threads;

	public:

		// Initialize algorithm
		DLL_EXPORT
		GaMultithreadingAlgorithm(const GaMultithreadingAlgorithmParams& parameters);

		// Frees resources
		DLL_EXPORT
		virtual ~GaMultithreadingAlgorithm();

		// Sets new parameters for algorithm
		DLL_EXPORT
		virtual void GACALL SetAlgorithmParameters(const GaAlgorithmParams& parameters);

	protected:

		// Step of control flow before workers start
		DLL_EXPORT
		virtual void GACALL BeforeWorkers();

		// One step of work flow
		DLL_EXPORT
		virtual void GACALL WorkStep(int workerId);

		// Step of control flow after workers finish
		DLL_EXPORT
		virtual void GACALL AfterWorkers();

		// Called when user starts the algorithm
		DLL_EXPORT
		virtual bool GACALL OnStart();

		// Called when user stops the algorithm
		DLL_EXPORT
		virtual bool GACALL OnStop();

		// Called when user pauses the algorithm
		DLL_EXPORT
		virtual bool GACALL OnPause();

		// Called when user resumes the paused algorithm
		DLL_EXPORT
		virtual bool GACALL OnResume();

		// Control flow of evolution
		DLL_EXPORT
		virtual void GACALL ControlFlow();

		// Working flow of evolution
		DLL_EXPORT
		virtual void GACALL WorkFlow();

		// Starts control and working threads.
		// Returns TRUE if all threads are started successafully.
		DLL_EXPORT
		virtual bool GACALL StartThreads();

		// Waits for threads to finish
		DLL_EXPORT
		virtual bool GACALL WaitForThreads();

	private:

		// Wraper method of control flow method for thread starting
		static ThreadFunctionReturn GACALL ControlFlowWrapper(GaThread* thread,
			void* params);

		// Wraper method of work flow method for thread starting
		static ThreadFunctionReturn GACALL WorkFlowWrapper(GaThread* thread,
			void* params);

	};// END CLASS DEFINITION GaMultithreadingAlgorithm

} // Algorithm

#endif // __GA_MULTITHREADING_ALGORITHM_H__