/*
 Copyright (c) 2013 yvt
 
 This file is part of OpenSpades.
 
 OpenSpades is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 OpenSpades is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with OpenSpades.  If not, see <http://www.gnu.org/licenses/>.
 
 */

#pragma once

#include "IRunnable.h"
#include <string>
#include <exception>

namespace spades {
	struct SyncQueueEntry;
	class DispatchThread;
	class SynchronizedQueue;
	class ConcurrentDispatch;
	
	class DispatchQueue {
		friend class ConcurrentDispatch;
		SynchronizedQueue *internal;
		DispatchQueue();
	public:
		~DispatchQueue();
		static DispatchQueue *GetThreadQueue();
		void ProcessQueue();
		void EnterEventLoop() throw();
		
		void MarkSDLVideoThread();
	};
	
	class ConcurrentDispatch: public IRunnable {
		friend class DispatchThread;
		friend class DispatchQueue;
		friend struct SyncQueueEntry;
		
		std::string name;
		SyncQueueEntry * volatile entry;
		
		IRunnable *runnable;
		
		void Execute();
		void ExecuteProtected() throw();
		
		// disable
		ConcurrentDispatch(const ConcurrentDispatch&){}
		void operator =(const ConcurrentDispatch& disp){}
	public:
		ConcurrentDispatch();
		ConcurrentDispatch(std::string name);
		virtual ~ConcurrentDispatch();
		
		void Start();
		void StartOn(DispatchQueue *);
		void Join();
		
		/** abandons the ownership of this dispatch instance, and
		 * when the dispatch completes, this instance will be deleted. */
		void Release();
		
		virtual void Run();
		
		void SetRunnable(IRunnable * r) {runnable = r;}
		IRunnable *GetRunnable() const { return runnable; }
		
	};
	
	template <class F>
	class FunctionDispatch: public ConcurrentDispatch {
		F f;
	public:
		FunctionDispatch(F f): f(f){}
		virtual void Run(){
			f();
		}
	};
	
}