class CThreadPool
{
friend class CWorkerThread;
private:
unsigned int m_MaxNum; //the max thread num that can create at the same time
unsigned int m_AvailLow; //The min num of idle thread that shoule kept
unsigned int m_AvailHigh; //The max num of idle thread that kept at the same time
unsigned int m_AvailNum; //the normal thread num of idle num;
unsigned int m_InitNum; //Normal thread num;
protected:
CWorkerThread* GetIdleThread(void);
void AppendToIdleList(CWorkerThread* jobthread);
void MoveToBusyList(CWorkerThread* idlethread);
void MoveToIdleList(CWorkerThread* busythread);
void DeleteIdleThread(int num);
void CreateIdleThread(int num);
public:
CThreadMutex m_BusyMutex; //when visit busy list,use m_BusyMutex to lock and unlock
CThreadMutex m_IdleMutex; //when visit idle list,use m_IdleMutex to lock and unlock
CThreadMutex m_JobMutex; //when visit job list,use m_JobMutex to lock and unlock
CThreadMutex m_VarMutex;
CCondition m_BusyCond; //m_BusyCond is used to sync busy thread list
CCondition m_IdleCond; //m_IdleCond is used to sync idle thread list
CCondition m_IdleJobCond; //m_JobCond is used to sync job list
CCondition m_MaxNumCond;
vector<CWorkerThread*> m_ThreadList;
vector<CWorkerThread*> m_BusyList; //Thread List
vector<CWorkerThread*> m_IdleList; //Idle List
CThreadPool();
CThreadPool(int initnum);
virtual ~CThreadPool();
void SetMaxNum(int maxnum){m_MaxNum = maxnum;}
int GetMaxNum(void){return m_MaxNum;}
void SetAvailLowNum(int minnum){m_AvailLow = minnum;}
int GetAvailLowNum(void){return m_AvailLow;}
void SetAvailHighNum(int highnum){m_AvailHigh = highnum;}
int GetAvailHighNum(void){return m_AvailHigh;}
int GetActualAvailNum(void){return m_AvailNum;}
int GetAllNum(void){return m_ThreadList.size();}
int GetBusyNum(void){return m_BusyList.size();}
void SetInitNum(int initnum){m_InitNum = initnum;}
int GetInitNum(void){return m_InitNum;}
void TerminateAll(void);
void Run(CJob* job,void* jobdata);
};
CThreadPool::CThreadPool()
{
m_MaxNum = 50;
m_AvailLow = 5;
m_InitNum=m_AvailNum = 10 ;
m_AvailHigh = 20;
m_BusyList.clear();
m_IdleList.clear();
for(int i=0;i<m_InitNum;i++){
CWorkerThread* thr = new CWorkerThread();
thr->SetThreadPool(this);
AppendToIdleList(thr);
thr->Start();
}
}
CThreadPool::CThreadPool(int initnum)
{
assert(initnum>0 && initnum<=30);
m_MaxNum = 30;
m_AvailLow = initnum-10>0?initnum-10:3;
m_InitNum=m_AvailNum = initnum ;
m_AvailHigh = initnum+10;
m_BusyList.clear();
m_IdleList.clear();
for(int i=0;i<m_InitNum;i++){
CWorkerThread* thr = new CWorkerThread();
AppendToIdleList(thr);
thr->SetThreadPool(this);
thr->Start(); //begin the thread,the thread wait for job
}
}
CThreadPool::~CThreadPool()
{
TerminateAll();
}
void CThreadPool::TerminateAll()
{
for(int i=0;i < m_ThreadList.size();i++) {
CWorkerThread* thr = m_ThreadList[i];
thr->Join();
}
return;
}
CWorkerThread* CThreadPool::GetIdleThread(void)
{
while(m_IdleList.size() ==0 )
m_IdleCond.Wait();
m_IdleMutex.Lock();
if(m_IdleList.size() > 0 )
{
CWorkerThread* thr = (CWorkerThread*)m_IdleList.front();
printf("Get Idle thread %dn",thr->GetThreadID());
m_IdleMutex.Unlock();
return thr;
}
m_IdleMutex.Unlock();
return NULL;
}
//add an idle thread to idle list
void CThreadPool::AppendToIdleList(CWorkerThread* jobthread)
{
m_IdleMutex.Lock();
m_IdleList.push_back(jobthread);
m_ThreadList.push_back(jobthread);
m_IdleMutex.Unlock();
}
//move and idle thread to busy thread
void CThreadPool::MoveToBusyList(CWorkerThread* idlethread)
{
m_BusyMutex.Lock();
m_BusyList.push_back(idlethread);
m_AvailNum--;
m_BusyMutex.Unlock();
m_IdleMutex.Lock();
vector<CWorkerThread*>::iterator pos;
pos = find(m_IdleList.begin(),m_IdleList.end(),idlethread);
if(pos !=m_IdleList.end())
m_IdleList.erase(pos);
m_IdleMutex.Unlock();
}
void CThreadPool::MoveToIdleList(CWorkerThread* busythread)
{
m_IdleMutex.Lock();
m_IdleList.push_back(busythread);
m_AvailNum++;
m_IdleMutex.Unlock();
m_BusyMutex.Lock();
vector<CWorkerThread*>::iterator pos;
pos = find(m_BusyList.begin(),m_BusyList.end(),busythread);
if(pos!=m_BusyList.end())
m_BusyList.erase(pos);
m_BusyMutex.Unlock();
m_IdleCond.Signal();
m_MaxNumCond.Signal();
}
//create num idle thread and put them to idlelist
void CThreadPool::CreateIdleThread(int num)
{
for(int i=0;i<num;i++){
CWorkerThread* thr = new CWorkerThread();
thr->SetThreadPool(this);
AppendToIdleList(thr);
m_VarMutex.Lock();
m_AvailNum++;
m_VarMutex.Unlock();
thr->Start(); //begin the thread,the thread wait for job
}
}
void CThreadPool::DeleteIdleThread(int num)
{
printf("Enter into CThreadPool::DeleteIdleThreadn");
m_IdleMutex.Lock();
printf("Delete Num is %dn",num);
for(int i=0;i<num;i++){
CWorkerThread* thr;
if(m_IdleList.size() > 0 ){
thr = (CWorkerThread*)m_IdleList.front();
printf("Get Idle thread %dn",thr->GetThreadID());
}
vector<CWorkerThread*>::iterator pos;
pos = find(m_IdleList.begin(),m_IdleList.end(),thr);
if(pos!=m_IdleList.end())
m_IdleList.erase(pos);
m_AvailNum--;
printf("The idle thread available num:%d n",m_AvailNum);
printf("The idlelist num:%d n",m_IdleList.size());
}
m_IdleMutex.Unlock();
}
void CThreadPool::Run(CJob* job,void* jobdata)
{
assert(job!=NULL);
//if the busy thread num adds to m_MaxNum,so we should wait
if(GetBusyNum() == m_MaxNum)
m_MaxNumCond.Wait();
if(m_IdleList.size()<m_AvailLow)
{
if(GetAllNum()+m_InitNum-m_IdleList.size() < m_MaxNum )
CreateIdleThread(m_InitNum-m_IdleList.size());
else
CreateIdleThread(m_MaxNum-GetAllNum());
}
CWorkerThread* idlethr = GetIdleThread();
if(idlethr !=NULL)
{
idlethr->m_WorkMutex.Lock();
MoveToBusyList(idlethr);
idlethr->SetThreadPool(this);
job->SetWorkThread(idlethr);
printf("Job is set to thread %d n",idlethr->GetThreadID());
idlethr->SetJob(job,jobdata);
}
}
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