汤浩
117 lines
3.0 KiB
C++
117 lines
3.0 KiB
C++
#ifndef THREAD_POOL_H
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#define THREAD_POOL_H
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#include <vector>
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#include <queue>
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#include <memory>
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#include <thread>
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#include <mutex>
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#include <condition_variable>
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#include <future>
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#include <functional>
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#include <stdexcept>
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#include <atomic>
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#include <chrono>
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#define MAX_THREAD_POOL_SIZE 5
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class ThreadPool {
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public:
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using Task = std::function<void()>;
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struct TaskWrapper {
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Task task;
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int priority;
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std::chrono::steady_clock::time_point enqueueTime;
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bool operator<(const TaskWrapper& other) const {
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// 优先级高的先执行，同优先级按入队时间FIFO
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if (priority != other.priority) {
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return priority < other.priority;
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}
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return enqueueTime > other.enqueueTime;
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}
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};
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explicit ThreadPool(size_t initialThreads = std::thread::hardware_concurrency());
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~ThreadPool();
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// 提交任务到线程池，返回future
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template<class F, class... Args>
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auto submitTask(int priority, F&& f, Args&&... args)
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-> std::future<typename std::result_of<F(Args...)>::type> {
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using return_type = typename std::result_of<F(Args...)>::type;
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auto task = std::make_shared< std::packaged_task<return_type()> >(
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std::bind(std::forward<F>(f), std::forward<Args>(args)...)
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);
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std::future<return_type> res = task->get_future();
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{
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std::unique_lock<std::mutex> lock(mutex);
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// Don't allow enqueueing after stopping the pool
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if(stop)
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throw std::runtime_error("enqueue on stopped ThreadPool");
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tasks.emplace(TaskWrapper{[task]() { (*task)(); },priority,std::chrono::steady_clock::now()});
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}
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condition.notify_one();
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return res;
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};
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// 调整工作线程数量
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void adjustThreadCount(size_t targetThreadCount);
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// 获取当前工作线程数
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size_t getThreadCount() const;
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// 获取任务队列大小
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size_t getTaskCount() const;
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// 获取正在执行任务的线程数
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size_t getBusyThreadCount() const;
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// 停止线程池
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void shutdown();
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// 等待所有任务完成
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void waitForAllTasks();
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private:
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// 工作线程函数
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void workerThread();
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// 管理线程函数
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void managerThread();
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// 添加工作线程
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void addWorker(size_t num = 1);
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// 移除工作线程
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void removeWorker(size_t num = 1);
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std::vector<std::thread> workers;
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std::priority_queue<TaskWrapper> tasks;
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std::thread manager;
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// 同步
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mutable std::mutex mutex;
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std::condition_variable condition;
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std::condition_variable waitCondition;
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// 状态标志
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std::atomic<bool> stop;
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std::atomic<size_t> busyThreads;
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std::atomic<size_t> totalThreads;
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std::atomic<size_t> pendingStopThreads;
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// 性能统计
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std::atomic<size_t> completedTasks;
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std::atomic<size_t> totalTasks;
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std::chrono::steady_clock::time_point lastAdjustment;
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};
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//#include "thread_pool.inl"
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#endif // THREAD_POOL_H
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