经典的线程池

#include <iostream>#include <mutex>#include <future>#include <thread> #include <exception>#include <functional>#include <numeric>#include <limits>#include <queue>using namespace std;class CThreadPool{bool m_boolIsWorking = true;std::mutex m_mtxWorkQueueMtx;std::condition_variable m_cvWorkCv;std::queue<std::function<void()>> m_queWorkQue;std::vector<std::thread> m_vecThreadVec;void WorkThread(){while (m_boolIsWorking){std::unique_lock<std::mutex> lk(m_mtxWorkQueueMtx);m_cvWorkCv.wait(lk, [this]() {return false == m_boolIsWorking || false == m_queWorkQue.empty();});if (false == m_boolIsWorking)return;auto task = std::move(m_queWorkQue.front());m_queWorkQue.pop();try {task();}catch (...){}}}public:CThreadPool(){m_boolIsWorking = true;auto size = std::thread::hardware_concurrency();while (0 != size--)m_vecThreadVec.push_back(std::thread(&CThreadPool::WorkThread, this));}~CThreadPool() {m_boolIsWorking = false;std::unique_lock<std::mutex> lk(m_mtxWorkQueueMtx);m_cvWorkCv.notify_all();lk.unlock();for (auto & th : m_vecThreadVec)th.join();}void PutTask(std::function<void()> f){std::unique_lock<std::mutex> lk(m_mtxWorkQueueMtx);m_queWorkQue.push(std::move(f));m_cvWorkCv.notify_one();}};int main(){{CThreadPool pool;int a;while (cin >> a){if (0 == a)break;while (0 != a--){pool.PutTask([]() {std::this_thread::sleep_for(std::chrono::seconds(1));cout << ".";});}}}int pause;cin >> pause;}