#ifndef __THREAD_POOL_EXECUTOR__  
#define __THREAD_POOL_EXECUTOR__  
  
#include "thread.h"  
#include <set>  
#include <list>  
#include <windows.h>  
  
class CThreadPoolExecutor  
{  
public:  
    CThreadPoolExecutor(void);  
    ~CThreadPoolExecutor(void);

private:
	static CThreadPoolExecutor* m_pThreadPoolExecutor;

public:
	static CThreadPoolExecutor* GetInstance();
	static void FreeInstance();
  
    /** 
      初始化线程池，创建minThreads个线程 
    **/  
    bool Init(unsigned int minThreads, unsigned int maxThreads, unsigned int maxPendingTaskse);  
  
    /** 
      执行任务，若当前任务列表没有满，将此任务插入到任务列表，返回true 
      若当前任务列表满了，但当前线程数量小于最大线程数，将创建新线程执行此任务，返回true 
      若当前任务列表满了，但当前线程数量等于最大线程数，将丢弃此任务，返回false 
    **/  
    bool Execute(Runnable * pRunnable);  
  
    /** 
      终止线程池，先制止塞入任务， 
      然后等待直到任务列表为空， 
      然后设置最小线程数量为0， 
      等待直到线程数量为空， 
      清空垃圾堆中的任务 
    **/  
    void Terminate();  
  
    /** 
      返回线程池中当前的线程数量 
    **/  
    unsigned int GetThreadPoolSize();  
  
private:  
    /** 
      获取任务列表中的任务，若任务列表为空，返回NULL 
    **/  
    Runnable * GetTask();  
  
    static unsigned int WINAPI StaticThreadFunc(void * arg);  
  
private:  
    class CWorker : public CThread  
    {  
    public:  
        CWorker(CThreadPoolExecutor * pThreadPool, Runnable * pFirstTask = NULL);  
        ~CWorker();  
        void Run();  
  
    private:  
        CThreadPoolExecutor * m_pThreadPool;  
        Runnable * m_pFirstTask;  
        volatile bool m_bRun;  
    };  
  
    typedef std::set<CWorker *> ThreadPool;  
    typedef std::list<Runnable *> Tasks;  
    typedef Tasks::iterator TasksItr;  
    typedef ThreadPool::iterator ThreadPoolItr;  
  
    ThreadPool m_ThreadPool;  
    ThreadPool m_TrashThread;  
    Tasks m_Tasks;  
  
    CRITICAL_SECTION m_csTasksLock;  
    CRITICAL_SECTION m_csThreadPoolLock;  
  
    volatile bool m_bRun;  
    volatile bool m_bEnableInsertTask;  
    volatile unsigned int m_minThreads;  
    volatile unsigned int m_maxThreads;  
    volatile unsigned int m_maxPendingTasks;  
};  
  
#endif