Changed: Run tasks for slave on master on seperate thread to avoid blocking

--HG--
branch : build_pipeline_v3

code/nel/tools/pipeline/service/module_pipeline_master.cpp

@@ -35,6 +35,7 @@
 // NeL includes
 #include <nel/misc/debug.h>
 #include <nel/net/service.h>
+#include <nel/misc/task_manager.h>
 
 // Project includes
 #include "info_flags.h"
@@ -99,12 +100,14 @@ class CModulePipelineMaster :
 			}
 		}
 		
+		/*
 		// TODO: THIS WILL CRASH IF CALLED WHEN THE SLAVE ALREADY DISCONNECTED!!! USE A SELF DELETING CLASS INSTEAD (and check g_IsExiting there too)!!!
 		void cbUpdateDatabaseStatus()
 		{
 			Proxy.masterUpdatedDatabaseStatus(Master);
 			CInfoFlags::getInstance()->removeFlag(PIPELINE_INFO_MASTER_UPDATE_DATABASE_FOR_SLAVE);
 		}
+		*/
 
 		bool canAcceptTask()
 		{
@@ -119,14 +122,48 @@ protected:
 	CBuildTaskQueue m_BuildTaskQueue;
 	bool m_BuildWorking;
 
+	NLMISC::CTaskManager *m_TaskManager; // Manages tasks requested by a slave.
+	NLMISC::CSynchronized<std::list<IRunnable *>> m_WaitingCallbacks;
+
+	// A runnable that's executed at next update state used as a callback.
+	// Override runnable as normal as the callback function.
+	class CDelayedCallback : public IRunnable
+	{
+	public:
+		CDelayedCallback(CModulePipelineMaster *master) : Master(master)
+		{ 
+			NLMISC::CSynchronized<std::list<IRunnable *>>::CAccessor waitingCallbacks(&Master->m_WaitingCallbacks);
+			waitingCallbacks.value().push_back(this);
+		}
+		inline CCallback<void> getCallback() { return CCallback<void>(this, &CDelayedCallback::callback); }
+		CModulePipelineMaster *Master;
+
+	private:
+		void callback()
+		{
+			{
+				Master->addUpdateTask(this);
+			}
+			{
+				NLMISC::CSynchronized<std::list<IRunnable *>>::CAccessor waitingCallbacks(&Master->m_WaitingCallbacks);
+				waitingCallbacks.value().remove(this);
+			}
+		}
+	};
+
+	// Runnable tasks that are ran on the next update cycle.
+	// The IRunnable instance is deleted by the update cycle.
+	NLMISC::CSynchronized<std::deque<IRunnable *>> m_UpdateTasks;
+
 	// build command
 	bool m_BypassErrors;
 	bool m_VerifyOnly;
 
 public:
-	CModulePipelineMaster() : m_BuildWorking(false)
+	CModulePipelineMaster() : m_BuildWorking(false), m_TaskManager(NULL), m_WaitingCallbacks("WaitingCallbacks"), m_UpdateTasks("UpdateTasks")
 	{
 		g_IsMaster = true;
+		m_TaskManager = new NLMISC::CTaskManager();
 	}
 
 	virtual ~CModulePipelineMaster()
@@ -136,6 +173,25 @@ public:
 
 		g_IsMaster = false;
 
+		delete m_TaskManager;
+		m_TaskManager = NULL;
+
+		// Wait for waiting callbacks to be called
+		for (; ; )
+		{
+			{
+				NLMISC::CSynchronized<std::list<IRunnable *>>::CAccessor waitingCallbacks(&m_WaitingCallbacks);
+				if (waitingCallbacks.value().size() == 0)
+					break;
+			}
+			
+			nlwarning("Waiting for callbacks on the master to be called...");
+			nlSleep(1000);
+		}
+
+		// Ensure the remaining update tasks are handled
+		handleUpdateTasks();
+
 		m_SlavesMutex.lock();
 		
 		for (TSlaveMap::iterator it = m_Slaves.begin(), end = m_Slaves.end(); it != end; ++it)
@@ -145,6 +201,10 @@ public:
 		m_SlavesMutex.unlock();
 	}
 
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+
 	virtual bool initModule(const TParsedCommandLine &initInfo)
 	{
 		CModuleBase::initModule(initInfo);
@@ -219,8 +279,43 @@ public:
 		}
 	}
 
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+
+	// Add a task to be run at the next update
+	// The IRunnable will be deleted
+	void addUpdateTask(IRunnable *runnable)
+	{
+		NLMISC::CSynchronized<std::deque<IRunnable *>>::CAccessor updateTasks(&m_UpdateTasks);
+		updateTasks.value().push_back(runnable);
+	}
+
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+
+	void handleUpdateTasks()
+	{
+		for (; ; )
+		{
+			IRunnable *currentRunnable;
+			{
+				NLMISC::CSynchronized<std::deque<IRunnable *>>::CAccessor updateTasks(&m_UpdateTasks);
+				if (updateTasks.value().size() == 0)
+					break;
+				currentRunnable = updateTasks.value().front();
+				updateTasks.value().pop_front();
+			}
+			currentRunnable->run();
+		}
+	}
+
 	virtual void onModuleUpdate()
 	{
+		// handle update tasks (like network responses from callbacks)
+		handleUpdateTasks();
+
 		// if state build, iterate trough all slaves to see if any is free, and check if there's any waiting tasks
 		if (m_BuildWorking)
 		{
@@ -286,6 +381,10 @@ public:
 		}
 	}
 
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+
 	virtual void slaveFinishedBuildTask(NLNET::IModuleProxy *sender, uint8 errorLevel)
 	{
 		// TODO
@@ -352,6 +451,50 @@ public:
 		slave->Vector.push_back(str);
 	}
 
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+
+	class CUpdateDatabaseStatusSlaveCallback : public CDelayedCallback
+	{
+	public:
+		CUpdateDatabaseStatusSlaveCallback(CModulePipelineMaster *master, NLNET::IModuleProxy *slaveProxy) : CDelayedCallback(master), m_SlaveProxy(slaveProxy) { }
+		
+		virtual void run() // this is sanely run from the update thread
+		{
+			CSlave *slave = Master->m_Slaves[m_SlaveProxy];
+			if (slave == NULL) { nlwarning("Slave disconnected before callback could be delivered"); return; }
+
+			slave->Proxy.masterUpdatedDatabaseStatus(Master);
+			CInfoFlags::getInstance()->removeFlag(PIPELINE_INFO_MASTER_UPDATE_DATABASE_FOR_SLAVE);
+
+			delete this;
+		}
+		
+	private:
+		NLNET::IModuleProxy *m_SlaveProxy;
+	};
+
+	class CUpdateDatabaseStatusByVectorTask : public IRunnable
+	{
+	public:
+		CUpdateDatabaseStatusByVectorTask(CModulePipelineMaster *master, NLNET::IModuleProxy *sender, std::vector<std::string> &slaveVector) : m_Master(master), m_Sender(sender) 
+		{ 
+			std::swap(slaveVector, m_Vector);
+		}
+		virtual void run() // run from the master process task manager
+		{
+			CUpdateDatabaseStatusSlaveCallback *cb = new CUpdateDatabaseStatusSlaveCallback(m_Master, m_Sender); // deleted by update
+			g_DatabaseStatus->updateDatabaseStatus(cb->getCallback(), m_Vector, false, false);
+
+			delete this;
+		}
+	private:
+		CModulePipelineMaster *m_Master;
+		NLNET::IModuleProxy *m_Sender;
+		std::vector<std::string> m_Vector;
+	};
+	
 	virtual void updateDatabaseStatusByVector(NLNET::IModuleProxy *sender)
 	{
 		// FIXME: THIS MUST BE DONE ON A SEPERATE THREAD, IT HANGS WHILE ITERATING
@@ -379,10 +522,16 @@ public:
 			}
 		}
 		
-		if (ok) g_DatabaseStatus->updateDatabaseStatus(CCallback<void>(slave, &CSlave::cbUpdateDatabaseStatus), slave->Vector, false, false);
+		if (ok)
-		
+		{
-		slave->Vector.clear();
+			CUpdateDatabaseStatusByVectorTask *slaveTask = new CUpdateDatabaseStatusByVectorTask(this, sender, slave->Vector); // slave->Vector is wiped due to swap
+			m_TaskManager->addTask(slaveTask);
 		}
+	}
+
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
+	///////////////////////////////////////////////////////////////////
 
 	void setAvailablePlugins(NLNET::IModuleProxy *sender, const std::vector<uint32> &pluginsAvailable)
 	{