add：添加线程池。

include/of_util.h

@@ -1,12 +1,17 @@
 #pragma once
 #include "of_def.hpp"
+#include <algorithm>
 #include <cassert>
+#include <condition_variable>
+#include <cstring>
+#include <functional>
+#include <future>
 #include <iostream>
 #include <memory>
 #include <mutex>
+#include <queue>
+#include <thread>
 #include <vector>
-#include <algorithm>
-#include <cstring>
 
 namespace ofen {
 template <typename T> class OfSingleton
@@ -37,6 +42,7 @@ class CMutBuffer
 {
 public:
     CMutBuffer() = default;
+
 public:
     void push(const char* data, int len);
     int index_of(const char* data, int len, int start_pos = 0);
@@ -44,9 +50,177 @@ public:
     int get_len() const;
     void remove_of(int start_pos, int len);
     void clear();
+
 private:
     std::vector<char> buffer_;
     std::mutex mutex_;
 };
 
+template <typename T> class CQueueMt
+{
+public:
+    CQueueMt() = default;
+    CQueueMt(CQueueMt&& rh) noexcept
+    {
+    }
+    ~CQueueMt() = default;
+
+public:
+    bool empty()
+    {
+        std::unique_lock<std::mutex> lock(mutex_);
+        return queue_.empty();
+    }
+    size_t size()
+    {
+        std::unique_lock<std::mutex> lock(mutex_);
+        return queue_.size();
+    }
+    void push(T& t)
+    {
+        std::unique_lock<std::mutex> lock(mutex_);
+        queue_.emplace(t);
+    }
+    bool pop(T& t)
+    {
+        std::unique_lock<std::mutex> lock(mutex_);
+        if (queue_.empty())
+            return false;
+        t = std::move(queue_.front());
+        queue_.pop();
+        return true;
+    }
+    void clear()
+    {
+        std::unique_lock<std::mutex> lock(mutex_);
+        std::queue<T> queue;
+        std::swap(queue_, queue);
+    }
+
+private:
+    std::mutex mutex_;
+    std::queue<T> queue_;
+};
+
+class CThreadPool
+{
+private:
+    class CWorker
+    {
+    public:
+        CWorker(CThreadPool* pool, const size_t id) : id_(id), pool_(pool)
+        {
+            is_run_ = false;
+        }
+        void operator()()
+        {
+            std::function<void()> func;
+            bool have = false;
+            while (pool_->is_start_ || !is_run_ || is_continue()) {
+                is_run_ = true;
+                {
+                    std::unique_lock<std::mutex> lock(pool_->mutex_);
+                    if (pool_->queue_.empty())
+                        pool_->cv_.wait(lock);
+                    have = pool_->queue_.pop(func);
+                }
+
+                if (have)
+                    func();
+            }
+        }
+        bool is_continue()
+        {
+            if (!pool_->is_wait_)
+                return false;
+            if (pool_->queue_.empty())
+                return false;
+            return true;
+        }
+
+    private:
+        size_t id_;
+        CThreadPool* pool_;
+        bool is_run_;
+    };
+
+public:
+    explicit CThreadPool(const int num = 4)
+        : th_cnt_(num), is_start_(false), is_wait_(false), threads_(std::vector<std::thread>(num))
+    {
+    }
+    ~CThreadPool()
+    {
+        close_wait_current();
+    }
+    CThreadPool(const CThreadPool&) = delete;
+    CThreadPool(CThreadPool&&) = delete;
+    CThreadPool& operator=(const CThreadPool&) = delete;
+    CThreadPool& operator=(CThreadPool&&) = delete;
+
+public:
+    // 初始化线程池
+    void init()
+    {
+        if (!is_start_) {
+            threads_.resize(th_cnt_);
+            for (size_t i = 0; i < threads_.size(); ++i) {
+                threads_.at(i) = std::thread(CWorker(this, i));
+            }
+            is_start_ = true;
+            is_wait_ = false;
+            return;
+        }
+    }
+    void close_wait_current()
+    {
+        if (!is_start_)
+            return;
+        is_wait_ = false;
+        is_start_ = false;
+        close();
+        queue_.clear();
+    }
+    void close_wait_all()
+    {
+        if (!is_start_)
+            return;
+        is_wait_ = true;
+        is_start_ = false;
+        close();
+        queue_.clear();
+    }
+    template <typename F, typename... Args> auto submit(F&& f, Args&&... args) -> std::future<decltype(f(args...))>
+    {
+        std::function<decltype(f(args...))()> func = std::bind(std::forward<F>(f), std::forward<Args>(args)...);
+        auto pTask = std::make_shared<std::packaged_task<decltype(f(args...))()>>(func);
+        std::function<void()> rf = [pTask]() { (*pTask)(); };
+        queue_.push(rf);
+        cv_.notify_one();
+        return pTask->get_future();
+    }
+
+private:
+    void close()
+    {
+        cv_.notify_all();
+
+        for (auto& m_thread : threads_) {
+            if (m_thread.joinable())
+                m_thread.join();
+        }
+        threads_.clear();
+    }
+
+private:
+    int th_cnt_;
+    bool is_start_;
+    bool is_wait_;
+    std::mutex mutex_;
+
+    CQueueMt<std::function<void()>> queue_;
+    std::vector<std::thread> threads_;
+    std::condition_variable cv_;
+};
+
 }   // namespace ofen