TaskSchedulerImpl for POSIX and compilation fixes

Former-commit-id: a402d40ac90cacf444b5832c49cfbdaf61f7f747

include/Nazara/Core/ConditionVariable.hpp

@@ -8,11 +8,12 @@
 #define NAZARA_CONDITIONVARIABLE_HPP
 
 #include <Nazara/Prerequesites.hpp>
+#include <Nazara/Core/NonCopyable.hpp>
 
 class NzConditionVariableImpl;
 class NzMutex;
 
-class NAZARA_API NzConditionVariable
+class NAZARA_API NzConditionVariable : NzNonCopyable
 {
 	public:
 		NzConditionVariable();

include/Nazara/Core/File.hpp

@@ -23,6 +23,8 @@
 	#include <Nazara/Core/ThreadSafetyOff.hpp>
 #endif
 
+#include <ctime>
+
 class NzFileImpl;
 
 class NAZARA_API NzFile : public NzHashable, public NzInputStream, NzNonCopyable

include/Nazara/Core/Mutex.hpp

@@ -21,7 +21,9 @@ class NAZARA_API NzMutex : NzNonCopyable
 		~NzMutex();
 
 		void Lock();
+
 		bool TryLock();
+
 		void Unlock();
 
 	private:

include/Nazara/Core/Semaphore.hpp

@@ -19,7 +19,9 @@ class NAZARA_API NzSemaphore : NzNonCopyable
 		~NzSemaphore();
 
 		unsigned int GetCount() const;
+
 		void Post();
+
 		void Wait();
 		bool Wait(nzUInt32 timeout);
 

include/Nazara/Math/Algorithm.inl

@@ -6,6 +6,7 @@
 #include <Nazara/Core/String.hpp>
 #include <Nazara/Math/Config.hpp>
 #include <algorithm>
+#include <cstdlib>
 #include <cstring>
 #include <Nazara/Core/Debug.hpp>
 

src/Nazara/Core/Error.cpp

@@ -11,6 +11,7 @@
 	#include <windows.h>
 #elif defined(NAZARA_PLATFORM_POSIX)
 	#include <cstring>
+	#include <errno.h>
 #endif
 
 #include <Nazara/Core/Debug.hpp>

src/Nazara/Core/MemoryManager.cpp

@@ -6,6 +6,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <ctime>
+#include <new>
 #include <stdexcept>
 
 #if defined(NAZARA_PLATFORM_WINDOWS)

src/Nazara/Core/Posix/DirectoryImpl.cpp

@@ -6,6 +6,9 @@
 #include <Nazara/Core/Error.hpp>
 #include <Nazara/Core/Debug.hpp>
 
+#include <errno.h>
+#include <sys/param.h>
+
 NzDirectoryImpl::NzDirectoryImpl(const NzDirectory* parent)
 {
 	NazaraUnused(parent);
@@ -82,13 +85,10 @@ bool NzDirectoryImpl::Exists(const NzString& dirPath)
 NzString NzDirectoryImpl::GetCurrent()
 {
 	NzString currentPath;
-	char* path = getcwd(nullptr, 0);
 
-	if (path)
+	char path[MAXPATHLEN];
-	{
+	if (getcwd(path, MAXPATHLEN))
 		currentPath = path;
-		free(path);
-	}
 	else
 		NazaraError("Unable to get current directory: " + NzError::GetLastSystemError()); // Bug: initialisation -> if no path for log !
 

src/Nazara/Core/Posix/FileImpl.cpp

@@ -4,9 +4,7 @@
 
 #include <Nazara/Core/Posix/FileImpl.hpp>
 #include <Nazara/Core/Error.hpp>
-#include <stdio.h>
+#include <cstdio>
-#include <unistd.h>
-#include <time.h>
 #include <Nazara/Core/Debug.hpp>
 
 NzFileImpl::NzFileImpl(const NzFile* parent) :

src/Nazara/Core/Posix/HardwareInfoImpl.cpp

@@ -6,13 +6,13 @@
 #include <Nazara/Core/Error.hpp>
 #include <Nazara/Core/Debug.hpp>
 
-void NzHardwareInfoImpl::Cpuid(nzUInt32 code, nzUInt32 result[4])
+void NzHardwareInfoImpl::Cpuid(nzUInt32 functionId, nzUInt32 subFunctionId, nzUInt32 registers[4])
 {
 #if defined(NAZARA_COMPILER_CLANG) || defined(NAZARA_COMPILER_GCC) || defined(NAZARA_COMPILER_INTEL)
 	// Source: http://stackoverflow.com/questions/1666093/cpuid-implementations-in-c
 	asm volatile ("cpuid" // Besoin d'être volatile ?
-				  : "=a" (result[0]), "=b" (result[1]), "=c" (result[2]), "=d" (result[3]) // output
+	              : "=a" (registers[0]), "=b" (registers[1]), "=c" (registers[2]), "=d" (registers[3]) // output
-                  : "a" (code), "c" (0));                                                  // input
+	              : "a" (functionId), "c" (subFunctionId));                                // input
 #else
 	NazaraInternalError("Cpuid has been called although it is not supported");
 #endif

src/Nazara/Core/Posix/HardwareInfoImpl.hpp

@@ -13,7 +13,7 @@
 class NzHardwareInfoImpl
 {
 	public:
-		static void Cpuid(nzUInt32 code, nzUInt32 result[4]);
+		static void Cpuid(nzUInt32 functionId, nzUInt32 subFunctionId, nzUInt32 registers[4]);
 		static unsigned int GetProcessorCount();
 		static bool IsCpuidSupported();
 };

src/Nazara/Core/Posix/TaskSchedulerImpl.cpp

@@ -0,0 +1,207 @@
+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Core/Posix/TaskSchedulerImpl.hpp>
+#include <Nazara/Core/Config.hpp>
+#include <Nazara/Core/Error.hpp>
+#include <Nazara/Core/Debug.hpp>
+
+#include <iostream>
+
+bool NzTaskSchedulerImpl::Initialize(unsigned int workerCount)
+{
+	if (IsInitialized())
+		return true; // Déjà initialisé
+
+	#if NAZARA_CORE_SAFE
+	if (workerCount == 0)
+	{
+		NazaraError("Invalid worker count ! (0)");
+		return false;
+	}
+	#endif
+
+	s_workerCount = workerCount;
+	s_isDone = false;
+	s_isWaiting = false;
+	s_shouldFinish = false;
+
+	s_threads.reset(new pthread_t[workerCount]);
+
+	// On initialise les conditions variables, mutex et barrière.
+	pthread_cond_init(&s_cvEmpty, nullptr);
+	pthread_cond_init(&s_cvNotEmpty, nullptr);
+	pthread_mutex_init(&s_mutexQueue, nullptr);
+	pthread_barrier_init(&s_barrier, nullptr, workerCount + 1);
+
+	for (unsigned int i = 0; i < s_workerCount; ++i)
+	{
+		// Le thread va se lancer, attendre que tous se créent et attendre d'être réveillé.
+		pthread_create(&s_threads[i], nullptr, WorkerProc, nullptr);
+	}
+
+	pthread_barrier_wait(&s_barrier); // On attend que les enfants soient bien créés.
+
+	return true;
+}
+
+bool NzTaskSchedulerImpl::IsInitialized()
+{
+	return s_workerCount > 0;
+}
+
+void NzTaskSchedulerImpl::Run(NzFunctor** tasks, unsigned int count)
+{
+	// On s'assure que des tâches ne sont pas déjà en cours
+	Wait();
+
+	pthread_mutex_lock(&s_mutexQueue);
+	s_isDone = false;
+
+	while (count--)
+		s_tasks.push(*tasks++);
+
+	pthread_cond_signal(&s_cvNotEmpty);
+	pthread_mutex_unlock(&s_mutexQueue);
+}
+
+void NzTaskSchedulerImpl::Uninitialize()
+{
+	#ifdef NAZARA_CORE_SAFE
+	if (s_workerCount == 0)
+	{
+		NazaraError("Task scheduler is not initialized");
+		return;
+	}
+	#endif
+
+	// On commence par vider la queue et demander qu'ils s'arrêtent.
+	s_shouldFinish = true;
+
+	ClearQueue();
+
+	{
+		// On réveille les threads pour qu'ils sortent de la boucle et terminent.
+		pthread_mutex_lock(&s_mutexQueue);
+		pthread_cond_broadcast(&s_cvNotEmpty);
+		pthread_mutex_unlock(&s_mutexQueue);
+	}
+
+	// On attend que chaque thread se termine
+	for (unsigned int i = 0; i < s_workerCount; ++i)
+		pthread_join(s_threads[i], nullptr);
+
+	// Et on libère les ressources
+	pthread_barrier_destroy(&s_barrier);
+	pthread_cond_destroy(&s_cvEmpty);
+	pthread_cond_destroy(&s_cvNotEmpty);
+	pthread_mutex_destroy(&s_mutexQueue);
+
+	s_workerCount = 0;
+}
+
+void NzTaskSchedulerImpl::WaitForTasks()
+{
+	#ifdef NAZARA_CORE_SAFE
+	if (s_workerCount == 0)
+	{
+		NazaraError("Task scheduler is not initialized");
+		return;
+	}
+	#endif
+
+	Wait();
+}
+
+void NzTaskSchedulerImpl::ClearQueue()
+{
+	pthread_mutex_lock(&s_mutexQueue);
+	std::queue<NzFunctor*> emptyQueue;
+	std::swap(s_tasks, emptyQueue);
+	pthread_mutex_unlock(&s_mutexQueue);
+}
+
+NzFunctor* NzTaskSchedulerImpl::PopQueue()
+{
+	NzFunctor* task = nullptr;
+
+	pthread_mutex_lock(&s_mutexQueue);
+
+	if (!s_tasks.empty())
+	{
+		task = s_tasks.front();
+		s_tasks.pop();
+	}
+
+	pthread_mutex_unlock(&s_mutexQueue);
+
+	return task;
+}
+
+void NzTaskSchedulerImpl::Wait()
+{
+	if (s_isDone)
+		return;
+
+	if (!s_isDone)
+	{
+		s_isWaiting = true;
+		pthread_mutex_lock(&s_mutexQueue);
+		pthread_cond_broadcast(&s_cvNotEmpty);
+		pthread_cond_wait(&s_cvEmpty, &s_mutexQueue);
+		pthread_mutex_unlock(&s_mutexQueue);
+	}
+	s_isDone = true;
+}
+
+void* NzTaskSchedulerImpl::WorkerProc(void* /*userdata*/)
+{
+	// On s'assure que tous les threads soient correctement lancés.
+	pthread_barrier_wait(&s_barrier);
+
+	// On quitte s'il doit terminer.
+	while (!s_shouldFinish)
+	{
+		NzFunctor* task = PopQueue();
+
+		if (task)
+		{
+			// On exécute la tâche avant de la supprimer
+			task->Run();
+			delete task;
+		}
+		else
+		{
+			pthread_mutex_lock(&s_mutexQueue);
+			if (s_tasks.empty())
+				s_isDone = true;
+
+			while (!(!s_tasks.empty() || s_isWaiting || s_shouldFinish))
+				pthread_cond_wait(&s_cvNotEmpty, &s_mutexQueue);
+
+			if (s_tasks.empty() && s_isWaiting)
+			{
+				// On prévient le thread qui attend que les tâches soient effectuées.
+				s_isWaiting = false;
+				pthread_cond_signal(&s_cvEmpty);
+			}
+
+			pthread_mutex_unlock(&s_mutexQueue);
+		}
+	}
+
+	return nullptr;
+}
+
+std::queue<NzFunctor*> NzTaskSchedulerImpl::s_tasks;
+std::unique_ptr<pthread_t[]> NzTaskSchedulerImpl::s_threads;
+std::atomic<bool> NzTaskSchedulerImpl::s_isDone;
+std::atomic<bool> NzTaskSchedulerImpl::s_isWaiting;
+std::atomic<bool> NzTaskSchedulerImpl::s_shouldFinish;
+unsigned int NzTaskSchedulerImpl::s_workerCount;
+
+pthread_mutex_t NzTaskSchedulerImpl::s_mutexQueue;
+pthread_cond_t NzTaskSchedulerImpl::s_cvEmpty;
+pthread_cond_t NzTaskSchedulerImpl::s_cvNotEmpty;
+pthread_barrier_t NzTaskSchedulerImpl::s_barrier;

src/Nazara/Core/Posix/TaskSchedulerImpl.hpp

@@ -0,0 +1,48 @@
+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_TASKSCHEDULERIMPL_HPP
+#define NAZARA_TASKSCHEDULERIMPL_HPP
+
+#include <Nazara/Prerequesites.hpp>
+#include <Nazara/Core/Functor.hpp>
+#include <atomic>
+#include <memory>
+#include <pthread.h>
+#include <queue>
+
+class NzTaskSchedulerImpl
+{
+	public:
+		NzTaskSchedulerImpl() = delete;
+		~NzTaskSchedulerImpl() = delete;
+
+		static bool Initialize(unsigned int workerCount);
+		static bool IsInitialized();
+		static void Run(NzFunctor** tasks, unsigned int count);
+		static void Uninitialize();
+		static void WaitForTasks();
+
+	private:
+		static void ClearQueue();
+		static NzFunctor* PopQueue();
+		static void Wait();
+		static void* WorkerProc(void* userdata);
+
+		static std::queue<NzFunctor*> s_tasks;
+		static std::unique_ptr<pthread_t[]> s_threads;
+		static std::atomic<bool> s_isDone;
+		static std::atomic<bool> s_isWaiting;
+		static std::atomic<bool> s_shouldFinish;
+		static unsigned int s_workerCount;
+
+		static pthread_mutex_t s_mutexQueue;
+		static pthread_cond_t s_cvEmpty;
+		static pthread_cond_t s_cvNotEmpty;
+		static pthread_barrier_t s_barrier;
+};
+
+#endif // NAZARA_TASKSCHEDULERIMPL_HPP