类定义如下
// ThreadPoolImp.h: interface for the ThreadPoolImp class.
//
//////////////////////////////////////////////////////////////////////
#if !defined(AFX_THREADPOOLIMP_H__82F4FC7E_2DB4_4D2A_ACC8_2EFC787CAE42__INCLUDED_)
#define AFX_THREADPOOLIMP_H__82F4FC7E_2DB4_4D2A_ACC8_2EFC787CAE42__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#pragma warning( disable : 4705 4786)
#include <map>
#include "AutoLock.h"
using namespace std;
class IJobDesc;
class IWorker;
class CThreadPoolImp
{
public:
class ThreadInfo
{
public:
ThreadInfo() { m_hThread=0; m_bBusyWorking=false; }
ThreadInfo(HANDLE handle, bool bBusy) { m_hThread=handle; m_bBusyWorking=bBusy; }
ThreadInfo(const ThreadInfo& info) { m_hThread=info.m_hThread; m_bBusyWorking=info.m_bBusyWorking; }
////////
HANDLE m_hThread;
bool m_bBusyWorking;
};
typedef map<DWORD,ThreadInfo> ThreadInfoMap;
typedef ThreadInfoMap::iteratorIterator_ThreadInfoMap;
friend static unsigned int CThreadPoolImp::ManagerProc(void* p);
friend static unsigned int CThreadPoolImp::WorkerProc(void* p);
protected:
enum ThreadPoolStatus { BUSY, IDLE, NORMAL };
public:
//interface to the outside
void Start(unsigned short nStatic, unsigned short nmax);
void Stop(bool bHash=false);
void ProcessJob(IJobDesc* pJob, IWorker* pWorker) const;
//constructor and destructor
CThreadPoolImp();
virtual ~CThreadPoolImp();
protected:
//interfaces public:
HANDLE GetMgrIoPort() const { return m_hMgrIoPort; }
UINT GetMgrWaitTime() const { return 1000; }
HANDLE GetWorkerIoPort() const { return m_hWorkerIoPort; }
private:
static DWORD WINAPI ManagerProc(void* p);
static DWORD WINAPI WorkerProc(void* p);
protected:
//manager thread
HANDLE m_hMgrThread;
HANDLE m_hMgrIoPort;
protected:
//configuration parameters
mutable unsigned short m_nNumberOfStaticThreads;
mutable unsigned short m_nNumberOfTotalThreads;
protected:
//helper functions
void AddThreads();
void RemoveThreads();
ThreadPoolStatus GetThreadPoolStatus();
void ChangeStatus(DWORD threadId, bool status);
void RemoveThread(DWORD threadId);
protected:
//all the work threads
ThreadInfoMap m_threadMap;
CCriticalSection m_arrayCs;
HANDLE m_hWorkerIoPort;
};
#endif // !defined(AFX_THREADPOOLIMP_H__82F4FC7E_2DB4_4D2A_ACC8_2EFC787CAE42__INCLUDED_)
实现如下
// ThreadPool.cpp: implementation of the CThreadPoolImp class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "ThreadPoolimp.h"
#include "outdebug.h"
#include <assert.h>
#include "work.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
//#define new DEBUG_NEW
#endif
CThreadPoolImp::CThreadPoolImp()
{
}
CThreadPoolImp::~CThreadPoolImp()
{
}
void CThreadPoolImp::Start(unsigned short nStatic, unsigned short nMax)
{
assert(nMax>=nStatic);
HANDLE hThread;
DWORD nThreadId;
m_nNumberOfStaticThreads=nStatic;
m_nNumberOfTotalThreads=nMax;
//lock the resource
CAutoLock AutoLock(m_arrayCs);
//create an IO port
m_hMgrIoPort = CreateIoCompletionPort((HANDLE)INVALID_HANDLE_VALUE, NULL, 0, 0);
hThread = CreateThread(
NULL, // SD
0, // initial stack size
(LPTHREAD_START_ROUTINE)ManagerProc, // thread function
(LPVOID)this, // thread argument
0, // creation option
&nThreadId ); // thread identifier
m_hMgrThread = hThread;
//now we start these worker threads
m_hWorkerIoPort = CreateIoCompletionPort((HANDLE)INVALID_HANDLE_VALUE, NULL, 0, 0);
for(long n = 0; n < nStatic; n++)
{
hThread = CreateThread(
NULL, // SD
0, // initial stack size
(LPTHREAD_START_ROUTINE)WorkerProc,// thread function
(LPVOID)this, // thread argument
0, // creation option
&nThreadId );
ReportDebug("generate a worker thread handle id is %d.\n", nThreadId);
m_threadMap.insert(m_threadMap.end(),ThreadInfoMap::value_type (nThreadId,ThreadInfo(hThread, false)));
}
}
void CThreadPoolImp::Stop(bool bHash)
{
CAutoLock Lock(m_arrayCs);
::PostQueuedCompletionStatus(m_hMgrIoPort, 0, 0, (OVERLAPPED*)0xFFFFFFFF);
WaitForSingleObject(m_hMgrThread, INFINITE);
CloseHandle(m_hMgrThread);
CloseHandle(m_hMgrIoPort);
//shut down all the worker threads
UINT nCount=m_threadMap.size();
HANDLE* pThread = new HANDLE[nCount];
long n=0;
ThreadInfo info;
Iterator_ThreadInfoMap i=m_threadMap.begin();
while(i!=m_threadMap.end())
{
::PostQueuedCompletionStatus(m_hWorkerIoPort, 0, 0, (OVERLAPPED*)0xFFFFFFFF);
info=i->second;
pThread[n++]=info.m_hThread;
i++;
}
DWORD rc=WaitForMultipleObjects(nCount, pThread, TRUE, 30000);
CloseHandle(m_hWorkerIoPort);
if(rc>=WAIT_OBJECT_0 && rc<WAIT_OBJECT_0+nCount)
{
for(unsigned int n=0;n<nCount;n++)
{
CloseHandle(pThread[n]);
}
}
else if(rc==WAIT_TIMEOUT&&bHash)
{
//some threads not terminated, we have to stop them.
DWORD exitCode;
for(unsigned int i=0; i<nCount; i++)
{
if (::GetExitCodeThread(pThread[i], &exitCode)==STILL_ACTIVE)
{
TerminateThread(pThread[i], 99);
}
CloseHandle(pThread[i]);
}
}
delete[] pThread;
}
DWORD WINAPI CThreadPoolImp::ManagerProc(void* p)
{
//convert the parameter to the server pointer.
CThreadPoolImp* pServer=(CThreadPoolImp*)p;
HANDLE IoPort = pServer->GetMgrIoPort();
unsigned long pN1, pN2;
OVERLAPPED* pOverLapped;
LABEL_MANAGER_PROCESSING:
while(::GetQueuedCompletionStatus(IoPort, &pN1, &pN2,
&pOverLapped, pServer->GetMgrWaitTime() ))
{
if(pOverLapped == (OVERLAPPED*)0xFFFFFFFF)
{
return 0;
}
else
{
ReportDebug("mgr events comes in!\n");
}
}
//time out processing
if (::GetLastError()==WAIT_TIMEOUT)
{
//time out processing
ReportDebug("Time out processing!\n");
//the manager will take a look at all the worker´s status. The
if (pServer->GetThreadPoolStatus()==CThreadPoolImp::BUSY)
pServer->AddThreads();
if (pServer->GetThreadPoolStatus()==CThreadPoolImp::IDLE)
pServer->RemoveThreads();
goto LABEL_MANAGER_PROCESSING;
}
return 0;
}
DWORD WINAPI CThreadPoolImp::WorkerProc(void* p)
{
//convert the parameter to the server pointer.
CThreadPoolImp* pServer=(CThreadPoolImp*)p;
HANDLE IoPort = pServer->GetWorkerIoPort();
unsigned long pN1, pN2;
OVERLAPPED* pOverLapped;
DWORD threadId=::GetCurrentThreadId();
ReportDebug("worker thread id is %d.\n", threadId);
while(::GetQueuedCompletionStatus(IoPort, &pN1, &pN2,
&pOverLapped, INFINITE ))
{
if(pOverLapped == (OVERLAPPED*)0xFFFFFFFE)
{
pServer->RemoveThread(threadId);
break;
}
else if(pOverLapped == (OVERLAPPED*)0xFFFFFFFF)
{
break;
}
else
{
ReportDebug("worker events comes in!\n");
//before processing, we need to change the status to busy.
pServer->ChangeStatus(threadId, true);
//retrieve the job descrīption and agent pointer
IWorker* pIWorker = reinterpret_cast<IWorker*>(pN1);
IJobDesc* pIJob= reinterpret_cast<IJobDesc*>(pN2);
pIWorker->ProcessJob(pIJob);
pServer->ChangeStatus(threadId, false);
}
}
return 0;
}
void CThreadPoolImp::ChangeStatus(DWORD threadId, bool status)
{
CAutoLock CAutoLock(m_arrayCs);
//retrieve the current thread handle
Iterator_ThreadInfoMap i;
ThreadInfo info;
i=m_threadMap.find(threadId);
info=i->second;
info.m_bBusyWorking=status;
m_threadMap.insert(m_threadMap.end(),ThreadInfoMap::value_type(threadId, info));
}
void CThreadPoolImp::ProcessJob(IJobDesc* pJob, IWorker* pWorker) const
{
::PostQueuedCompletionStatus(m_hWorkerIoPort, \
reinterpret_cast<DWORD>(pWorker), \
reinterpret_cast<DWORD>(pJob),\
NULL);
}
void CThreadPoolImp::AddThreads()
{
HANDLE hThread;
DWORD nThreadId;
unsigned int nCount=m_threadMap.size();
unsigned int nTotal=min(nCount+2, m_nNumberOfTotalThreads);
for(unsigned int i=0; i<nTotal-nCount; i++)
{
hThread = CreateThread(
NULL, // SD
0, // initial stack size
(LPTHREAD_START_ROUTINE)WorkerProc,// thread function
(LPVOID)this, // thread argument
0, // creation option
&nThreadId );
ReportDebug("generate a worker thread handle id is %d.\n", nThreadId);
m_threadMap.insert(m_threadMap.end(),ThreadInfoMap::value_type(nThreadId,ThreadInfo(hThread, false)));
}
}
void CThreadPoolImp::RemoveThread(DWORD threadId)
{
CAutoLock lock(m_arrayCs);
m_threadMap.erase(threadId);
}
void CThreadPoolImp::RemoveThreads()
{
unsigned int nCount=m_threadMap.size();
unsigned int nTotal=max(nCount-2, m_nNumberOfStaticThreads);
for(unsigned int i=0; i<nCount-nTotal; i++)
{
::PostQueuedCompletionStatus(m_hWorkerIoPort, 0, 0, (OVERLAPPED*)0xFFFFFFFE);
}
}
CThreadPoolImp::ThreadPoolStatus CThreadPoolImp::GetThreadPoolStatus()
{
int nTotal = m_threadMap.size();
ThreadInfo info;
int nCount=0;
Iterator_ThreadInfoMap i=m_threadMap.begin();
while(i!=m_threadMap.end())
{
info=i->second;
if (info.m_bBusyWorking==true) nCount++;
i++;
}
if ( nCount/(1.0*nTotal) > 0.8 )
return BUSY;
if ( nCount/ (1.0*nTotal) < 0.2 )
return IDLE;
return NORMAL;
}
