pthread库实现一个简单的任务池

类关系图：

说明：
        1：TaskManager类管理Task类，Task类是一个纯虚类;
        2：ThreadManager类管理Thread类，Thread类封装pthread库的相关线程函数;
        3：Thread类通过TaskManager类获取需要执行的任务;
        4：ThreadManager类中包含一个TaskManager用于管理需要其管理线程执行的Task;
        5：UserTask是用户继承Task类而来的用户自己的任务类，最后线程池中运行的任务就是UserTask。

该交代的都交代了，现在上代码。^-^

Task.h

/**********************
* author: zhanghang
* date: 2016.02.27
* file: Task.h
* usage: this is the pure virtual base class of the task in the task pool
***********************/

#ifndef _TASK_H
#define _TASK_H

#define TIMES_OF_SLEEP_ONE_SEC 1500000

class Task
{
public:
    Task(){};
    virtual ~Task(){};
    virtual void Process() = 0;
    // all the delay operations should use this function
    void Delay(int sec)
    {   
        for(int i=0; i<sec; ++i)
        {
            for(int j=0; j<TIMES_OF_SLEEP_ONE_SEC; ++j)
            {
            }
        }
    }   
};

#endif

自己封装了一个锁类，GuardLock.h

/************************
* author: zhanghang
* date: 2016.02.27
* file: GuardLock.h
* usage: this class to lock a code scope
************************/

#ifndef _GUARD_LOCK_H
#define _GUARD_LOCK_H

#include <pthread.h>
#include <iostream>

class GuardLock
{
public:
    GuardLock(pthread_mutex_t *pMutex):m_pMutex(pMutex)
    {
        pthread_mutex_lock(m_pMutex);
    }
    ~GuardLock()
    {   
        pthread_mutex_unlock(m_pMutex);
    }
private:
    pthread_mutex_t *m_pMutex;
};      
    
#endif

TaskManager.h

/************************
* author: zhanghang
* date: 2016.02.27
* file: TaskManager.h
* usage: this class is to manage the tasks
***********************/

#ifndef _TASK_MANAGER_H
#define _TASK_MANAGER_H

#include <pthread.h>
#include <list>
class Task;

class TaskManager
{
public:
    TaskManager();
    ~TaskManager();
    void AddTask(Task *pTask);
    void DeleteAllTask();
    int GetTaskNum();
    Task *GetATask();
private:
    std::list<Task *> m_TaskList;
    pthread_mutex_t m_AccTaskListMutex;
};      
    
#endif

TaskManager.cpp

/************************
* author: zhanghang
* date: 2016.02.27
* file: TaskManager.cpp
* usage: this class is to manage the tasks
***********************/

#include "GuardLock.h"
#include "TaskManager.h"
#include "Task.h"
#include <iostream>

TaskManager::TaskManager()
{
    std::cout << "TaskManager::TaskManager*" << (void *)this << std::endl;
}

TaskManager::~TaskManager()
{   
    std::cout << "TaskManager::~TaskManager#" << (void *)this << std::endl;
    
    if(m_TaskList.size() > 0)
    {
        DeleteAllTask();
    }
}   

void TaskManager::AddTask(Task *pTask)
{
    GuardLock lock(&m_AccTaskListMutex);

    if(NULL != pTask)
    {
        m_TaskList.push_back(pTask);
    }
}

void TaskManager::DeleteAllTask()
{
    GuardLock lock(&m_AccTaskListMutex);

    std::list<Task *>::iterator taskItr = m_TaskList.begin();
    while(m_TaskList.end() != taskItr)
    {
        delete *taskItr;
        ++taskItr;
    }
    m_TaskList.clear();
}

int TaskManager::GetTaskNum()
{
    return m_TaskList.size();
}

Task *TaskManager::GetATask()
{
    GuardLock lock(&m_AccTaskListMutex);

    Task *pTask = NULL;
    std::list<Task *>::iterator taskBeg = m_TaskList.begin();
    if(m_TaskList.end() != taskBeg)
    {
        pTask = (*taskBeg);
        m_TaskList.erase(taskBeg);
    }
    return pTask;
}

Thread.h

/************************
* author: zhanghang
* date: 2016.02.27
* file: Thread.h
* usage: this class is to new a thread
***********************/
        
#ifndef _THREAD_H
#define _THREAD_H

#include <pthread.h>

#define TIMES_OF_SLEEP_ONE_SEC 1500000

class Task;
class TaskManager;

// the entrance of the new thread
void *ThreadMain(void *pArg);

class Thread
{
public:
    Thread(TaskManager &taskManager);
    ~Thread();
    int Run();
    int Stop();
    bool IsFree();
    // because there is one cnacel point in the sleep func
    // so i write my own delay func
    void Delay(int sec);

    friend void *ThreadMain(void *pArg);
private:
    bool m_IsFree;
    bool m_ExitFlag;
    Task *m_pTask;
    TaskManager &m_TaskMgr;
    pthread_t m_ThreadID;
};

#endif

Thread.cpp

/************************
* author: zhanghang
* date: 2016.02.27
* file: Thread.cpp
* usage: this class is to new a thread
***********************/

#include "Thread.h"
#include "Task.h"
#include "TaskManager.h"
#include <iostream>

Thread::Thread(TaskManager &taskMgr)
: m_IsFree(true), m_ExitFlag(false), m_pTask(NULL), m_TaskMgr(taskMgr), m_ThreadID(0)
{
    std::cout << "Thread::Thread*" << (void *)this << std::endl;
}

Thread::~Thread()
{
    std::cout << "Thread::~Thread#" << (void *)this << std::endl;

    if(!m_ExitFlag)
    {
        m_ExitFlag = true;
    }
}   
    
int Thread::Run()
{   
    return pthread_create(&m_ThreadID, NULL, ThreadMain, this);
}

int Thread::Stop()
{
    m_ExitFlag = true;
    void *pRet = NULL;
    pthread_cancel(m_ThreadID);
    return pthread_join(m_ThreadID, &pRet);
}

bool Thread::IsFree()
{
    return m_IsFree;
}

void Thread::Delay(int sec)
{
    for(int i=0; i<sec; ++i)
    {
        for(int j=0; j<TIMES_OF_SLEEP_ONE_SEC; ++j)
        {
        }
    }
}

// thre entrance of thread
void *ThreadMain(void *pArg)
{
    if(NULL == pArg)
    {
        return NULL;
    }

    // set the cancel state to enable
    pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
    // set the cancel type to run to next cnacel point
    pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL);

    Thread &rThread = *((Thread *)pArg);

    while(!rThread.m_ExitFlag)
    {
        rThread.m_pTask = rThread.m_TaskMgr.GetATask();

        // there is no task
        if(NULL == rThread.m_pTask)
        {
            rThread.m_IsFree = true;
            //sleep(1); // do not use sleep function, there is some cancel point in the function
            rThread.Delay(1);
            continue;
        }

        rThread.m_IsFree = false;
        // the mission
        rThread.m_pTask->Process();

        // clear the task room
        delete rThread.m_pTask;
        rThread.m_pTask = NULL;

        // set a cancel point
        pthread_testcancel();
    }
}

ThreadManager.h

/************************
* author: zhanghang
* date: 2016.02.07
* file: ThreadManager.h
* usage: this class is to manage the threads
*******************************/

#ifndef _THREAD_MANAGER_H
#define _THREAD_MANAGER_H

#include <list>
class Task;
class Thread;
class TaskManager;

class ThreadManager
{
public:
    ThreadManager();
    ~ThreadManager();
    int StartThreads(int num);
    int StopThreads();
    void AddTask(Task *);
    int GetTaskNum();
    int GetThreadNum();
    bool CreateTaskManager();
private:
    std::list<Thread *> m_ThreadList;
    TaskManager *m_pTaskMgr;
};

#endif

ThreadManager.cpp

/*********************
* author: zhanghang
* date: 2016.02.27
* file: ThreadManager.cpp
* usage: this class is to manage the task pool
*************************/

#include <iostream>
#include "ThreadManager.h"
#include "Thread.h"
#include "Task.h"
#include "TaskManager.h"

ThreadManager::ThreadManager(): m_pTaskMgr(NULL)
{
    std::cout << "ThreadManager::ThreadManager*" << (void *)this << std::endl;
}

ThreadManager::~ThreadManager()
{
    std::cout << "ThreadManager::~ThreadManager#" << (void *)this << std::endl;
    if(m_ThreadList.size() > 0)
    {   
        StopThreads();
    }   

    if(NULL != m_pTaskMgr)
    {   
        delete m_pTaskMgr;
        m_pTaskMgr = NULL;
    }   
}

bool ThreadManager::CreateTaskManager()
{
    if(NULL == m_pTaskMgr)
    {   
        m_pTaskMgr = new TaskManager();
        if(NULL == m_pTaskMgr)
        {
            return false;
        }
    }
    return true;
}

// return the truely thread num
int ThreadManager::StartThreads(int num)
{
    if(!CreateTaskManager())
    {
        return 0;
    }

    int result = 0;
    for(int i=0; i<num; ++i)
    {
        Thread *pThread = NULL;
        pThread = new Thread(*m_pTaskMgr);

        result = pThread->Run();
        if(0 != result)
        {
            std::cout << "one thread started failed! error code: " << result << std::endl;
            continue;
        }

        m_ThreadList.push_back(pThread);
    }

    return m_ThreadList.size();
}

// return the num of threads that left
int ThreadManager::StopThreads()
{
    std::list<Thread *>::iterator threadItr = m_ThreadList.begin();
    int result = 0;
    while(m_ThreadList.end() != threadItr)
    {
        result = (*threadItr)->Stop();

        if(0 != result)
        {
            std::cout << "one thread stopped failed! error code: " << result << std::endl;
            ++threadItr;
            continue;
        }

        // delete the thread
        delete *threadItr;
        m_ThreadList.erase(threadItr++);
    }

    // the left thread
    return m_ThreadList.size();
}

void ThreadManager::AddTask(Task *pTask)
{
    if(!CreateTaskManager())
    {
        return;
    }

    m_pTaskMgr->AddTask(pTask);
}

int ThreadManager::GetTaskNum()
{
    if(!CreateTaskManager())
    {
        return 0;
    }

    return m_pTaskMgr->GetTaskNum();
}

int ThreadManager::GetThreadNum()
{
    return m_ThreadList.size();
}

main.cpp

/*************
* author: zhanghang
* date: 2016.02.27
* file: main.cpp
* usage: this is a demo of taskpool
********************************/

#include "ThreadManager.h"
#include "Task.h"
#include <iostream>
#include <unistd.h>


#define THREAD_NUM 3

// this is the task
class MyTask : public Task
{
public:
    MyTask()
    {
        std::cout << "MyTask::MyTask*" << (void *)this << std::endl;
    }
    ~MyTask()
    {
        std::cout << "MyTask::~MyTask#" << (void *)this << std::endl;
    }
    void Process()
    {
        std::cout << "thread id: " << pthread_self() << std::endl;
        Delay(1);
    }
};

int main(int argc, char **argv)
{
    ThreadManager threadMgr;
    threadMgr.StartThreads(THREAD_NUM);

    for(int i=0; i<20; ++i)
    {
        MyTask *pMyTask = new MyTask();
        Task *pTask = (Task *) pMyTask;

        // add task
        threadMgr.AddTask(pTask);
    }

    sleep(4);

    threadMgr.StopThreads();

    return 1;
}

makefile

main: ThreadMgr Thread TaskMgr
    g++ -o main main.cpp ThreadManager.o Thread.o TaskManager.o -lpthread -g
ThreadMgr:
    g++ -c ThreadManager.cpp ThreadManager.h Thread.h TaskManager.h Task.h -g
Thread:
    g++ -c Thread.cpp Thread.h Task.h TaskManager.h -g
TaskMgr:
    g++ -c TaskManager.cpp TaskManager.h GuardLock.h Task.h -g

clean:
    rm *.o

运行程序后程序的输出：

ThreadManager::ThreadManager*0xbfdf52d4
TaskManager::TaskManager*0x8599008
Thread::Thread*0x8599030
Thread::Thread*0x85990f0
Thread::Thread*0x85991b0
MyTask::MyTask*0x8599270
MyTask::MyTask*0x8599290
MyTask::MyTask*0x85992b0
MyTask::MyTask*0x85992d0
MyTask::MyTask*0x85992f0
MyTask::MyTask*0x8599310
MyTask::MyTask*0x8599330
MyTask::MyTask*0x8599350
MyTask::MyTask*0x8599370
MyTask::MyTask*0x8599390
MyTask::MyTask*0x85993b0
MyTask::MyTask*0x85993d0
MyTask::MyTask*0x85993f0
MyTask::MyTask*0x8599410
MyTask::MyTask*0x8599430
MyTask::MyTask*0x8599450
MyTask::MyTask*0x8599470
MyTask::MyTask*0x8599490
MyTask::MyTask*0x85994b0
MyTask::MyTask*0x85994d0
thread id: 3058080576
thread id: 3074865984
thread id: 3066473280
MyTask::~MyTask#0x8599270
thread id: 3058080576
MyTask::~MyTask#0x8599290
thread id: 3074865984
MyTask::~MyTask#0x85992b0
thread id: 3066473280
MyTask::~MyTask#0x85992d0
thread id: 3058080576
MyTask::~MyTask#0x85992f0
thread id: 3074865984
MyTask::~MyTask#0x8599310
thread id: 3066473280
MyTask::~MyTask#0x8599330
thread id: 3058080576
MyTask::~MyTask#0x8599350
thread id: 3074865984
MyTask::~MyTask#0x8599370
thread id: 3066473280
MyTask::~MyTask#0x85993b0
thread id: 3074865984
MyTask::~MyTask#0x8599390
thread id: 3058080576
MyTask::~MyTask#0x85993f0
thread id: 3074865984
MyTask::~MyTask#0x85993d0
thread id: 3066473280
MyTask::~MyTask#0x8599410
thread id: 3058080576
MyTask::~MyTask#0x8599430
thread id: 3074865984
MyTask::~MyTask#0x8599450
thread id: 3066473280
MyTask::~MyTask#0x8599470
thread id: 3058080576
MyTask::~MyTask#0x8599490
MyTask::~MyTask#0x85994b0
MyTask::~MyTask#0x85994d0
Thread::~Thread#0x8599030
Thread::~Thread#0x85990f0
Thread::~Thread#0x85991b0
ThreadManager::~ThreadManager#0xbfdf52d4
TaskManager::~TaskManager#0x8599008

谢谢。

发表于 2016-02-28 21:58 ++C+C++ 阅读(526) 评论(0) 编辑收藏举报

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pthread库实现一个简单的任务池

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