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threadpool.cpp
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// system header files
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
// user-defined header files
#include "threadpool.h"
//===============================================================
// CThread
//抽象类，所有线程类的基类，提供一个接口Run
//Linux中线程的包装，封装了Linux线程最常使用的属性和方法
//===============================================================
void* GlobalThreadFunction(void* argv)
{
CThread* thr = reinterpret_cast<CThread*>(argv);
if (thr) {
thr->SetThreadState(THREAD_RUNNING);
thr->Run();
thr->SetThreadState(THREAD_FINISHED);
}
return NULL;
}
CThread::CThread()
{
m_CreateSuspended = false;
SetThreadState(THREAD_IDLE);
m_ThreadName = NULL;
m_Detach = false;
sem_init(&m_ThreadSemaphore,false,0);
}
CThread::CThread(bool createsuspended,bool detach)
{
m_CreateSuspended = createsuspended;
SetThreadState(THREAD_IDLE);
m_ThreadName = NULL;
m_Detach = detach;
sem_init(&m_ThreadSemaphore,false,0);
}
CThread::~CThread()
{
if(NULL != m_ThreadName)
free(m_ThreadName);
SetThreadState(THREAD_FINISHED);
sem_destroy(&m_ThreadSemaphore);
}
bool CThread::Terminate(void)
{
if(pthread_cancel(m_ThreadID)!=0) {
SetThreadState(THREAD_TERMINATED);
SetErrcode(Error_ThreadTerminated);
return false;
} else
return true;
}
bool CThread::Start(void)
{
if(m_CreateSuspended) {
SetThreadState(THREAD_SUSPENDED);
sem_wait(&m_ThreadSemaphore);
}
int result = pthread_create(&m_ThreadID,NULL,GlobalThreadFunction,this);
if (result == 0) {
if (m_Detach)
pthread_detach(m_ThreadID);
return true;
} else {
SetThreadState(THREAD_DEAD);
return false;
}
return true;
}
void* CThread::ThreadFunction(void* argv)
{
CThread* thr = reinterpret_cast<CThread*>(argv);
if (thr){
thr->SetThreadState(THREAD_RUNNING);
thr->Run();
thr->SetThreadState(THREAD_FINISHED);
}
return NULL;
}
void CThread::Exit(void)
{
SetThreadState(THREAD_FINISHED);
pthread_exit((void**)0);
}
bool CThread::Wakeup(void)
{
if(sem_post(&m_ThreadSemaphore)!=0) {
SetErrcode(Error_ThreadWakeup);
return false;
} else {
SetThreadState(THREAD_RUNNING);
return true;
}
}
bool CThread::SetPriority(int priority)
{
if(priority >10 || priority <0) {
SetErrcode(Error_ThreadSetPriority);
return false;
}
struct sched_param threadParameter;
threadParameter.sched_priority = priority;
if (pthread_setschedparam(m_ThreadID, SCHED_OTHER, &threadParameter) != 0) {
SetErrcode(Error_ThreadSetPriority);
return false;
} else
return true;
}
int CThread::GetPriority(void)
{
struct sched_param threadParameter;
int policy = 0;
if(pthread_getschedparam(m_ThreadID, &policy, &threadParameter) == 0) {
return -1;
} else
return threadParameter.sched_priority;
}
bool CThread::Detach(void)
{
if(pthread_detach(m_ThreadID)!=0) {
SetErrcode(Error_ThreadDetach);
return false;
} else
return true;
}
bool CThread::Join(void)
{
if(pthread_join(m_ThreadID,NULL)!=0) {
SetErrcode(Error_ThreadJoin);
return false;
} else
return true;
}
bool CThread::Yield(void)
{
if(sched_yield()!=0) {
SetErrcode(Error_ThreadYield);
return false;
} else
return true;
}
int CThread::Self(void)
{
return pthread_self();
}
int CThread::SetConcurrency(int num)
{
return pthread_setconcurrency(num);
}
int CThread::GetConcurrency(void)
{
return pthread_getconcurrency();
}
//===============================================================
// CJob
//所有任务的基类,提供一个接口Run,所有任务类都必须从该类继承，同时实现Run方法
//该方法实现具体的任务逻辑
//===============================================================
CJob::CJob(void)
: m_pWorkThread(NULL),
m_JobNo(0),
m_JobName(NULL) {
}
CJob::~CJob()
{
if(m_JobName != NULL)
free(m_JobName);
}
bool CJob::GetTerminated(void)
{
return false;
}
void CJob::SetJobName(char* jobname)
{
if(m_JobName != NULL) {
free(m_JobName);
m_JobName = NULL;
}
if(jobname != NULL) {
m_JobName = (char *)malloc(strlen(jobname)+1);
strcpy(m_JobName, jobname);
}
}
//===============================================================
// CWorkerThread
//实际被调度和执行的线程类，从CThread继承，实现CThread中的Run方法
//实际执行用户提交的具体任务
//===============================================================
CWorkerThread::CWorkerThread()
{
m_Job = NULL;
m_JobData = NULL;
m_ThreadPool = NULL;
m_IsEnd = false;
}
CWorkerThread::~CWorkerThread()
{
if(m_Job != NULL)
delete m_Job;
if(m_ThreadPool != NULL)
delete m_ThreadPool;
}
void CWorkerThread::Run()
{
SetThreadState(THREAD_RUNNING);
while(1){
//在没有接收到实际任务时，m_Job为NULL，线程调用Wait等待，处于挂起状态
while(m_Job == NULL) {
m_JobCond.Wait();
}
m_Job->Run(m_JobData);
m_Job->SetWorkThread(NULL);
m_Job = NULL;
m_ThreadPool->MoveToIdleList(this);
//线程执行任务结束后返回空闲队列前，需对当前空闲队列中的线程数目进行判断，
//如果空闲线程数目高于m_AvailHigh，表明负载可能过轻，有必要删除多余的空闲线程，将线程调整为m_InitNum个
if(m_ThreadPool->m_IdleList.size() > m_ThreadPool->GetAvailHighNum()) {
m_ThreadPool->DeleteIdleThread(m_ThreadPool->m_IdleList.size() - m_ThreadPool->GetInitNum());
}
}
}
void CWorkerThread::SetJob(CJob* job, void* jobdata)
{
m_VarMutex.Lock();
m_Job = job;
m_JobData = jobdata;
job->SetWorkThread(this);
m_VarMutex.Unlock();
//唤醒得到任务的线程
m_JobCond.Signal();
}
void CWorkerThread::SetThreadPool(CThreadPool* threadpool)
{
m_VarMutex.Lock();
m_ThreadPool = threadpool;
m_VarMutex.Unlock();
}
//===============================================================
// CThreadPool
//线程池类，负责保存线程(STL Vector)，释放线程，调度线程
//创建具体的线程，并把用户提交的任务分发给CWorkerThread
//在CThreadPool中存在两个链表，一个是空闲(Idle)链表,一个是忙碌(Busy)链表,
//空闲链表中存放所有的空闲线程，当线程执行任务时，其状态变为忙碌，同时从空闲链表中删除，并移至忙碌链表中
//===============================================================
CThreadPool::CThreadPool()
{
m_MaxNum = 50;
m_AvailLow = 5;
m_AvailNum = m_InitNum = 10;
m_AvailHigh = 20;
m_BusyList.clear();
m_IdleList.clear();
for(unsigned int i = 0; i < m_InitNum; i++) {
CWorkerThread* workerthr = new CWorkerThread();
workerthr->SetThreadPool(this);
AppendToIdleList(workerthr);
workerthr->Start();
}
fprintf(stdout, "Create Worker_Thread num:[%d] Success....\n", m_InitNum);
}
CThreadPool::CThreadPool(int initnum)
{
assert(initnum > 0 && initnum <= 30);
m_MaxNum = 30;
m_AvailLow = initnum-10>0?initnum-10:5;
m_AvailNum = m_InitNum = initnum;
m_AvailHigh = initnum + 10;
m_BusyList.clear();
m_IdleList.clear();
//创建m_InitNum数量的工作线程
for(unsigned int i = 0; i < m_InitNum; i++) {
CWorkerThread* workerthr = new CWorkerThread();
workerthr->SetThreadPool(this);
AppendToIdleList(workerthr);
//调用Start()启动工作线程，最终会调用CWorkerThread::Run()方法
workerthr->Start();
}
fprintf(stdout, "Create Worker_Thread num:[%d] Success....\n", m_InitNum);
}
void CThreadPool::TerminateAll()
{
for(unsigned int i = 0; i < m_ThreadList.size(); i++) {
CWorkerThread* workerthr = m_ThreadList[i];
workerthr->Join();
}
return;
}
CThreadPool::~CThreadPool()
{
TerminateAll();
}
CWorkerThread* CThreadPool::GetIdleThread(void)
{
while(m_IdleList.size() == 0)
m_IdleCond.Wait();
m_IdleMutex.Lock();
if(m_IdleList.size() > 0) {
CWorkerThread* workerthr = (CWorkerThread*)m_IdleList.front();
//fprintf(stdout, "Get Idle thread %ul\n", workerthr->GetThreadID());
m_IdleMutex.Unlock();
return workerthr;
}
m_IdleMutex.Unlock();
return NULL;
}
void CThreadPool::AppendToIdleList(CWorkerThread* jobthread)
{
m_IdleMutex.Lock();
m_IdleList.push_back(jobthread);
m_ThreadList.push_back(jobthread);
m_IdleMutex.Unlock();
}
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();
}
void CThreadPool::CreateIdleThread(int num)
{
for(int i = 0; i < num; i++) {
CWorkerThread* workerthr = new CWorkerThread();
workerthr->SetThreadPool(this);
AppendToIdleList(workerthr);
m_VarMutex.Lock();
m_AvailNum++;
m_VarMutex.Unlock();
workerthr->Start();
}
}
void CThreadPool::DeleteIdleThread(int num)
{
//fprintf(stdout, "Enter into CThreadPool::DeleteIdleThread\n");
m_IdleMutex.Lock();
for(int i = 0; i < num; i++) {
CWorkerThread* workerthr;
if(m_IdleList.size() > 0) {
workerthr = (CWorkerThread*)m_IdleList.front();
//fprintf(stdout, "Get Idle thread%d\n", workerthr->GetThreadID());
}
vector<CWorkerThread*>::iterator pos;
pos = find(m_IdleList.begin(), m_IdleList.end(), workerthr);
if(pos != m_IdleList.end())
m_IdleList.erase(pos);
m_AvailNum--;
//fprintf(stdout, "The idle thread available num %d\n",m_AvailNum);
//fprintf(stdout, "The idlelist num:%d\n",m_IdleList.size());
}
m_IdleMutex.Unlock();
}
void CThreadPool::Run(CJob* job, void* jobdata)
{
assert(job!=NULL);
//线程池在接受到新的任务之后，线程池要检查当前处于忙碌状态的线程是否达到了设定的最大值m_MaxNum，
//如果达到了，表明目前没有空闲线程可用，而且不能创建新的线程，必须等待直到有线程执行完毕返回到空闲队列中
if(GetBusyNum() == m_MaxNum) {
//zrpc_log_info(0,"*ThreadPool is all Busy, Please Wait\n");
m_MaxNumCond.Wait();
}
//如果空闲线程数目低于m_AvailLow，表明负载可能过重，有必要增加空闲线程池的数目，将线程调整为m_InitNum个
if(m_IdleList.size() < m_AvailLow) {
if(GetAllNum() + m_InitNum - m_IdleList.size() < m_MaxNum)
CreateIdleThread(m_InitNum - m_IdleList.size());
else //现有空闲线程总数，加上创建后的线程数不能超过m_MaxNum
CreateIdleThread(m_MaxNum - GetAllNum());
}
//调用GetIdleThread查找空闲线程
CWorkerThread* idlethr = GetIdleThread();
if(idlethr != NULL) {
//将线程移入忙碌队列
MoveToBusyList(idlethr);
idlethr->SetThreadPool(this);
job->SetWorkThread(idlethr);
//将任务指派给空闲线程
idlethr->SetJob(job,jobdata);
}
}
//===============================================================
// CThreadManage
//线程池与用户的直接接口，屏蔽内部具体实现（内部调用CThreadPool的相关操作）
//接受需要创建的线程初始个数，并接受用户提交的任务（具体非抽象）
//===============================================================
CThreadManage::CThreadManage()
{
m_NumOfThread = 10;
m_Poll = new CThreadPool(m_NumOfThread);
}
CThreadManage::CThreadManage(int num)
{
m_NumOfThread = num;
m_Poll = new CThreadPool(m_NumOfThread);
}
CThreadManage::~CThreadManage()
{
if(m_Poll != NULL)
delete m_Poll;
}
void CThreadManage::SetParallelNum(int num)
{
m_NumOfThread = num;
}
void CThreadManage::Run(CJob *job, void *jobdata)
{
m_Poll->Run(job, jobdata);
}
void CThreadManage::TerminateAll(void)
{
m_Poll->TerminateAll();
}