多线程消息处理

MultiThread.h：

#pragma once

#include 
#include 
#include 
#include 
#include 
#include 

using TaskFun = std::function;

class CMultiThread {
public:
    CMultiThread();
    ~CMultiThread();

    bool start();

    void stop();

    bool post(const TaskFun& task_fun);

private:
    void exec();

private:

    bool exist_;
    std::list> threads_;
    std::queue tasks_;
    std::mutex mutex_;
    std::condition_variable condition_;

    int32_t thead_num_;
};

MultiThread.cpp：

#include "MultiThread.h"
#include 

CMultiThread::CMultiThread()
    : exist_(false)
    , thead_num_(4)
{
}

CMultiThread::~CMultiThread() {}

bool CMultiThread::start() {
    if (exist_) {
        return false;
    }

    exist_ = true;

    for (size_t i = 0; i < thead_num_; i++)
    {
        std::shared_ptr sptr_thread =
            std::make_shared(std::thread(std::bind(&CMultiThread::exec, this)));
        threads_.push_back(sptr_thread);
    }
    return true;
}

void CMultiThread::stop() {
    if (!exist_) {
        return;
    }

    exist_ = false;
    condition_.notify_all();

    for (auto& iter_thread : threads_)
    {
        if (iter_thread->joinable()) {
            iter_thread->join();
        }
    }

    return;
}

bool CMultiThread::post(const TaskFun& task_fun) {
    std::lock_guard lock(mutex_);
    tasks_.push(task_fun);
    condition_.notify_one();
    return true;
}

void CMultiThread::exec() {
    while (exist_)
    {
        TaskFun task = nullptr;

        {
            std::unique_lock lock(mutex_);
            if (tasks_.empty()) {
                condition_.wait(lock);
            }

            if (!exist_) {
                break;
            }

            if (!tasks_.empty())
            {
                task = tasks_.front();
                tasks_.pop();
            }
        }

        if (nullptr != task) {
            task();
        }
    }

    return;
}

main:

#include 
#include "MultiThread.h"

int main() {

    std::mutex m;

    CMultiThread t;

    t.start();

    auto fun = [&]()
    {
        std::lock_guard lock(m);

        static int count = 0;
        std::cout << "Count: " << ++count << "thread-id: " << std::this_thread::get_id() << std::endl;
        std::this_thread::sleep_for(std::chrono::seconds(1));
    };

    for (int i = 0; i < 20; ++i)
    {
        t.post(fun);
        //std::this_thread::sleep_for(std::chrono::microseconds(500));
    }

    getchar();
    t.post(fun);
    getchar();
    t.stop();

    return 0;
}