Stabilized TaskScheduler (Still buggy)

Former-commit-id: a604c6616065342b21d2c11c27974ec11935a852

include/Nazara/Core/TaskScheduler.hpp

@@ -9,6 +9,7 @@
 
 #include <Nazara/Prerequesites.hpp>
 #include <Nazara/Core/Functor.hpp>
+#include <Nazara/Core/Thread.hpp>
 
 class NAZARA_API NzTaskScheduler
 {
@@ -20,7 +21,7 @@ class NAZARA_API NzTaskScheduler
 		template<typename F, typename... Args> static void AddTask(F function, Args... args);
 		template<typename C> static void AddTask(void (C::*function)(), C* object);
 		static unsigned int GetWorkerCount();
-		static bool Initialize();
+		static bool Initialize(unsigned int workerCount = NzThread::HardwareConcurrency());
 		static void Uninitialize();
 		static void WaitForTasks();
 

src/Nazara/Core/TaskScheduler.cpp

@@ -12,6 +12,8 @@
 #include <vector>
 #include <Nazara/Core/Debug.hpp>
 
+///FIXME: Revoir tout ça
+
 namespace
 {
 	struct TaskSchedulerImpl
@@ -21,9 +23,11 @@ namespace
 		NzConditionVariable waiterConditionVariable;
 		NzConditionVariable workerConditionVariable;
 		NzMutex taskMutex;
+		NzMutex taskCountMutex;
 		NzMutex waiterConditionVariableMutex;
 		NzMutex workerConditionVariableMutex;
 		volatile bool running = true;
+		unsigned int taskCount; ///TODO: Atomic
 	};
 
 	TaskSchedulerImpl* s_impl = nullptr;
@@ -50,14 +54,24 @@ namespace
 				task->Run(); // Chouette ! Allons travailler gaiement
 
 				delete task; // Sans oublier de supprimer la tâche
+
+				s_impl->taskCountMutex.Lock();
+				#ifdef NAZARA_DEBUG
+				if (s_impl->taskCount == 0)
+					NazaraInternalError("Task count is already 0");
+				#endif
+
+				if (--s_impl->taskCount == 0)
+				{
+					// On peut signaler la fin du travail
+					s_impl->waiterConditionVariableMutex.Lock();
+					s_impl->waiterConditionVariable.Signal();
+					s_impl->waiterConditionVariableMutex.Unlock();
+				}
+				s_impl->taskCountMutex.Unlock();
 			}
 			else
 			{
-				// On peut signaler à tout le monde qu'il n'y a plus de tâches
-				s_impl->waiterConditionVariableMutex.Lock();
-				s_impl->waiterConditionVariable.SignalAll();
-				s_impl->waiterConditionVariableMutex.Unlock();
-
 				// Nous attendons qu'une nouvelle tâche arrive
 				s_impl->workerConditionVariableMutex.Lock();
 				s_impl->workerConditionVariable.Wait(&s_impl->workerConditionVariableMutex);
@@ -81,19 +95,16 @@ unsigned int NzTaskScheduler::GetWorkerCount()
 	return s_impl->workers.size();
 }
 
-bool NzTaskScheduler::Initialize()
+bool NzTaskScheduler::Initialize(unsigned int workerCount)
 {
 	if (s_impl)
 		return true; // Déjà initialisé
 
 	s_impl = new TaskSchedulerImpl;
+	s_impl->workers.reserve(workerCount);
 
-	unsigned int workerCount = NzThread::HardwareConcurrency();
 	for (unsigned int i = 0; i < workerCount; ++i)
-	{
-		NzThread* thread = new NzThread(WorkerFunc);
-		s_impl->workers.push_back(thread);
-	}
+		s_impl->workers.push_back(new NzThread(WorkerFunc));
 
 	return true;
 }
@@ -104,6 +115,17 @@ void NzTaskScheduler::Uninitialize()
 	{
 		s_impl->running = false;
 
+		// S'il reste des tâches en cours, on les libère
+		{
+			NzLockGuard lock(s_impl->taskMutex);
+			while (!s_impl->tasks.empty())
+			{
+				delete s_impl->tasks.front();
+				s_impl->tasks.pop();
+			}
+		}
+
+		// Ensuite on réveille les threads pour qu'ils s'arrêtent d'eux-même
 		s_impl->workerConditionVariableMutex.Lock();
 		s_impl->workerConditionVariable.SignalAll();
 		s_impl->workerConditionVariableMutex.Unlock();
@@ -114,13 +136,6 @@ void NzTaskScheduler::Uninitialize()
 			delete thread;
 		}
 
-		// S'il reste des tâches en cours, on les libère
-		while (!s_impl->tasks.empty())
-		{
-			delete s_impl->tasks.front();
-			s_impl->tasks.pop();
-		}
-
 		delete s_impl;
 		s_impl = nullptr;
 	}
@@ -136,18 +151,20 @@ void NzTaskScheduler::WaitForTasks()
 	}
 	#endif
 
-	s_impl->taskMutex.Lock();
 	// Tout d'abord, il y a-t-il des tâches en attente ?
 	if (s_impl->tasks.empty())
-	{
-		s_impl->taskMutex.Unlock();
 		return;
-	}
+
+	s_impl->taskCount = s_impl->tasks.size();
 
 	// On verrouille d'abord la mutex entourant le signal (Pour ne pas perdre le signal en chemin)
 	s_impl->waiterConditionVariableMutex.Lock();
-	// Et ensuite seulement on déverrouille la mutex des tâches
-	s_impl->taskMutex.Unlock();
+
+	// Et ensuite seulement on réveille les worker
+	s_impl->workerConditionVariableMutex.Lock();
+	s_impl->workerConditionVariable.SignalAll();
+	s_impl->workerConditionVariableMutex.Unlock();
+
 	s_impl->waiterConditionVariable.Wait(&s_impl->waiterConditionVariableMutex);
 	s_impl->waiterConditionVariableMutex.Unlock();
 }
@@ -162,12 +179,5 @@ void NzTaskScheduler::AddTaskFunctor(NzFunctor* taskFunctor)
 	}
 	#endif
 
-	{
-		NzLockGuard lock(s_impl->taskMutex);
 	s_impl->tasks.push(taskFunctor);
 }
-
-	s_impl->workerConditionVariableMutex.Lock();
-	s_impl->workerConditionVariable.Signal();
-	s_impl->workerConditionVariableMutex.Unlock();
-}