Pause task manager threads while process is inactive

Author: Xottab-DUTY

src/xrCore/Threading/TaskManager.hpp

@@ -77,10 +77,13 @@ class XRCORE_API TaskManager final
 public:
     void RegisterThisThreadAsWorker();
     void UnregisterThisThreadAsWorker();
+
     void Wait(const Task& task) const;
     void WaitForChildren(const Task& task) const;
     bool ExecuteOneTask() const;
 
+    void Pause(bool pause) { shouldPause.store(pause, std::memory_order_release); }
+
 public:
     [[nodiscard]] size_t GetWorkersCount() const;
     [[nodiscard]] static size_t GetCurrentWorkerID();

src/xrEngine/device.cpp

@@ -619,13 +619,15 @@ void CRenderDevice::OnWindowActivate(SDL_Window* window, bool activated)
         b_is_InFocus = activated;
         if (b_is_InFocus)
         {
+            TaskScheduler->Pause(false);
             seqAppActivate.Process();
             app_inactive_time += TimerMM.GetElapsed_ms() - app_inactive_time_start;
         }
         else
         {
             app_inactive_time_start = TimerMM.GetElapsed_ms();
             seqAppDeactivate.Process();
+            TaskScheduler->Pause(true);
         }
     }
 }