Line data    Source code

       1             : /*
       2             :  *  Copyright (C) 2004-2024 Savoir-faire Linux Inc.
       3             :  *
       4             :  *  This program is free software: you can redistribute it and/or modify
       5             :  *  it under the terms of the GNU General Public License as published by
       6             :  *  the Free Software Foundation, either version 3 of the License, or
       7             :  *  (at your option) any later version.
       8             :  *
       9             :  *  This program is distributed in the hope that it will be useful,
      10             :  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
      12             :  *  GNU General Public License for more details.
      13             :  *
      14             :  *  You should have received a copy of the GNU General Public License
      15             :  *  along with this program. If not, see <https://www.gnu.org/licenses/>.
      16             :  */
      17             : #pragma once
      18             : 
      19             : #include <atomic>
      20             : #include <thread>
      21             : #include <functional>
      22             : #include <stdexcept>
      23             : #include <condition_variable>
      24             : #include <mutex>
      25             : 
      26             : namespace jami {
      27             : 
      28             : struct ThreadLoopException : public std::runtime_error
      29             : {
      30           0 :     ThreadLoopException()
      31           0 :         : std::runtime_error("ThreadLoopException")
      32           0 :     {}
      33             : };
      34             : 
      35             : class ThreadLoop
      36             : {
      37             : public:
      38             :     enum class ThreadState { READY, RUNNING, STOPPING };
      39             : 
      40             :     ThreadLoop(const std::function<bool()>& setup,
      41             :                const std::function<void()>& process,
      42             :                const std::function<void()>& cleanup);
      43             :     virtual ~ThreadLoop();
      44             : 
      45             :     void start();
      46             :     void exit();
      47             :     virtual void stop();
      48             :     void join();
      49             :     void waitForCompletion(); // thread will stop itself
      50             : 
      51             :     bool isRunning() const noexcept;
      52         330 :     bool isStopping() const noexcept { return state_ == ThreadState::STOPPING; }
      53             :     std::thread::id get_id() const noexcept { return threadId_; }
      54             : 
      55             : private:
      56             :     ThreadLoop(const ThreadLoop&) = delete;
      57             :     ThreadLoop(ThreadLoop&&) noexcept = delete;
      58             :     ThreadLoop& operator=(const ThreadLoop&) = delete;
      59             :     ThreadLoop& operator=(ThreadLoop&&) noexcept = delete;
      60             : 
      61             :     // These must be provided by users of ThreadLoop
      62             :     std::function<bool()> setup_;
      63             :     std::function<void()> process_;
      64             :     std::function<void()> cleanup_;
      65             : 
      66             :     void mainloop(std::thread::id& tid,
      67             :                   const std::function<bool()> setup,
      68             :                   const std::function<void()> process,
      69             :                   const std::function<void()> cleanup);
      70             : 
      71             :     std::atomic<ThreadState> state_ {ThreadState::READY};
      72             :     std::thread::id threadId_;
      73             :     std::thread thread_;
      74             : };
      75             : 
      76             : class InterruptedThreadLoop : public ThreadLoop
      77             : {
      78             : public:
      79         712 :     InterruptedThreadLoop(const std::function<bool()>& setup,
      80             :                           const std::function<void()>& process,
      81             :                           const std::function<void()>& cleanup)
      82         712 :         : ThreadLoop::ThreadLoop(setup, process, cleanup)
      83         712 :     {}
      84             : 
      85             :     void stop() override;
      86             : 
      87             :     void interrupt() noexcept { cv_.notify_one(); }
      88             : 
      89             :     template<typename Rep, typename Period>
      90             :     void wait_for(const std::chrono::duration<Rep, Period>& rel_time)
      91             :     {
      92             :         if (std::this_thread::get_id() != get_id())
      93             :             throw std::runtime_error("Unable to call wait_for outside thread context");
      94             : 
      95             :         std::unique_lock lk(mutex_);
      96             :         cv_.wait_for(lk, rel_time, [this]() { return isStopping(); });
      97             :     }
      98             : 
      99             :     template<typename Rep, typename Period, typename Pred>
     100             :     bool wait_for(const std::chrono::duration<Rep, Period>& rel_time, Pred&& pred)
     101             :     {
     102             :         if (std::this_thread::get_id() != get_id())
     103             :             throw std::runtime_error("Unable to call wait_for outside thread context");
     104             : 
     105             :         std::unique_lock lk(mutex_);
     106             :         return cv_.wait_for(lk, rel_time, [this, pred] { return isStopping() || pred(); });
     107             :     }
     108             : 
     109             :     template<typename Pred>
     110             :     void wait(Pred&& pred)
     111             :     {
     112             :         if (std::this_thread::get_id() != get_id())
     113             :             throw std::runtime_error("Unable to call wait outside thread context");
     114             : 
     115             :         std::unique_lock lk(mutex_);
     116             :         cv_.wait(lk, [this, p = std::forward<Pred>(pred)] { return isStopping() || p(); });
     117             :     }
     118             : 
     119             : private:
     120             :     std::mutex mutex_;
     121             :     std::condition_variable cv_;
     122             : };
     123             : 
     124             : } // namespace jami