godot/core/command_queue_mt.h

/*************************************************************************/
/*  command_queue_mt.h                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/* the following conditions:                                             */
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/* The above copyright notice and this permission notice shall be        */
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/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
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/*************************************************************************/
#ifndef COMMAND_QUEUE_MT_H
#define COMMAND_QUEUE_MT_H

#include "typedefs.h"
#include "os/semaphore.h"
#include "os/mutex.h"
#include "os/memory.h"
#include "simple_type.h"
/**
	@author Juan Linietsky <[email protected]>
*/

class CommandQueueMT {

	struct SyncSemaphore {

		Semaphore *sem;
		bool in_use;
	};

	struct CommandBase {
	
		virtual void call()=0;
		virtual ~CommandBase() {};
	};
	
	template<class T,class M>
	struct Command0 : public CommandBase {

		T*instance;
		M method;
	
		virtual void call() { (instance->*method)(); }
	};
	
	template<class T,class M,class P1>
	struct Command1 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
	
		virtual void call() { (instance->*method)(p1); }
	};
	
	template<class T,class M,class P1,class P2>
	struct Command2 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
	
		virtual void call() { (instance->*method)(p1,p2); }
	};

	template<class T,class M,class P1,class P2,class P3>
	struct Command3 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
	
		virtual void call() { (instance->*method)(p1,p2,p3); }
	};

	template<class T,class M,class P1,class P2,class P3,class P4>
	struct Command4 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
	
		virtual void call() { (instance->*method)(p1,p2,p3,p4); }
	};

	template<class T,class M,class P1,class P2,class P3,class P4,class P5>
	struct Command5 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
		typename GetSimpleTypeT<P5>::type_t p5;
	
		virtual void call() { (instance->*method)(p1,p2,p3,p4,p5); }
	};

	template<class T,class M,class P1,class P2,class P3,class P4,class P5,class P6>
	struct Command6 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
		typename GetSimpleTypeT<P5>::type_t p5;
		typename GetSimpleTypeT<P6>::type_t p6;
	
		virtual void call() { (instance->*method)(p1,p2,p3,p4,p5,p6); }
	};
	
	template<class T,class M,class P1,class P2,class P3,class P4,class P5,class P6,class P7>
	struct Command7 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
		typename GetSimpleTypeT<P5>::type_t p5;
		typename GetSimpleTypeT<P6>::type_t p6;
		typename GetSimpleTypeT<P7>::type_t p7;
	
		virtual void call() { (instance->*method)(p1,p2,p3,p4,p5,p6,p7); }
	};
		
	/* comands that return */
	
	template<class T,class M,class R>
	struct CommandRet0 : public CommandBase {

		T*instance;
		M method;
		R* ret;
		SyncSemaphore *sync;
	
		virtual void call() { *ret = (instance->*method)(); sync->sem->post(); sync->in_use=false; ; }
	};
	
	template<class T,class M,class P1,class R>
	struct CommandRet1 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		R* ret;
		SyncSemaphore *sync;
	
		virtual void call() { *ret = (instance->*method)(p1); sync->sem->post(); sync->in_use=false; ; }
	};
	
	template<class T,class M,class P1,class P2,class R>
	struct CommandRet2 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		R* ret;
		SyncSemaphore *sync;
	
		virtual void call() { *ret = (instance->*method)(p1,p2); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1,class P2,class P3,class R>
	struct CommandRet3 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		R* ret;
		SyncSemaphore *sync;
	
		virtual void call() { *ret = (instance->*method)(p1,p2,p3); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1,class P2,class P3,class P4,class R>
	struct CommandRet4 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
		R* ret;
		SyncSemaphore *sync;
	
		virtual void call() { *ret = (instance->*method)(p1,p2,p3,p4); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1,class P2,class P3,class P4,class P5,class R>
	struct CommandRet5 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
		typename GetSimpleTypeT<P5>::type_t p5;
		R* ret;
		SyncSemaphore *sync;
	
		virtual void call() { *ret = (instance->*method)(p1,p2,p3,p4,p5); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1,class P2,class P3,class P4,class P5,class P6,class R>
	struct CommandRet6 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
		typename GetSimpleTypeT<P5>::type_t p5;
		typename GetSimpleTypeT<P6>::type_t p6;
		R* ret;
		SyncSemaphore *sync;
	
		virtual void call() { *ret = (instance->*method)(p1,p2,p3,p4,p5,p6); sync->sem->post(); sync->in_use=false; ; }
	};	

	template<class T,class M,class P1,class P2,class P3,class P4,class P5,class P6,class P7,class R>
	struct CommandRet7 : public CommandBase {
	
		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
		typename GetSimpleTypeT<P5>::type_t p5;
		typename GetSimpleTypeT<P6>::type_t p6;
		typename GetSimpleTypeT<P7>::type_t p7;
		R* ret;
		SyncSemaphore *sync;
	
		virtual void call() { *ret = (instance->*method)(p1,p2,p3,p4,p5,p6,p7); sync->sem->post(); sync->in_use=false; ; }
	};	

	/** commands that don't return but sync */

	/* comands that return */

	template<class T,class M>
	struct CommandSync0 : public CommandBase {

		T*instance;
		M method;

		SyncSemaphore *sync;

		virtual void call() {  (instance->*method)(); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1>
	struct CommandSync1 : public CommandBase {

		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;

		SyncSemaphore *sync;

		virtual void call() {  (instance->*method)(p1); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1,class P2>
	struct CommandSync2 : public CommandBase {

		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;

		SyncSemaphore *sync;

		virtual void call() {  (instance->*method)(p1,p2); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1,class P2,class P3>
	struct CommandSync3 : public CommandBase {

		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;

		SyncSemaphore *sync;

		virtual void call() {  (instance->*method)(p1,p2,p3); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1,class P2,class P3,class P4>
	struct CommandSync4 : public CommandBase {

		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;

		SyncSemaphore *sync;

		virtual void call() {  (instance->*method)(p1,p2,p3,p4); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1,class P2,class P3,class P4,class P5>
	struct CommandSync5 : public CommandBase {

		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
		typename GetSimpleTypeT<P5>::type_t p5;

		SyncSemaphore *sync;

		virtual void call() {  (instance->*method)(p1,p2,p3,p4,p5); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1,class P2,class P3,class P4,class P5,class P6>
	struct CommandSync6 : public CommandBase {

		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
		typename GetSimpleTypeT<P5>::type_t p5;
		typename GetSimpleTypeT<P6>::type_t p6;

		SyncSemaphore *sync;

		virtual void call() {  (instance->*method)(p1,p2,p3,p4,p5,p6); sync->sem->post(); sync->in_use=false; ; }
	};

	template<class T,class M,class P1,class P2,class P3,class P4,class P5,class P6,class P7>
	struct CommandSync7 : public CommandBase {

		T*instance;
		M method;
		typename GetSimpleTypeT<P1>::type_t p1;
		typename GetSimpleTypeT<P2>::type_t p2;
		typename GetSimpleTypeT<P3>::type_t p3;
		typename GetSimpleTypeT<P4>::type_t p4;
		typename GetSimpleTypeT<P5>::type_t p5;
		typename GetSimpleTypeT<P6>::type_t p6;
		typename GetSimpleTypeT<P7>::type_t p7;

		SyncSemaphore *sync;

		virtual void call() {  (instance->*method)(p1,p2,p3,p4,p5,p6,p7); sync->sem->post(); sync->in_use=false; ; }
	};

	/***** BASE *******/

	enum {	
		COMMAND_MEM_SIZE_KB=256,
		COMMAND_MEM_SIZE=COMMAND_MEM_SIZE_KB*1024,
		SYNC_SEMAPHORES=8
	};


	uint8_t command_mem[COMMAND_MEM_SIZE];
	uint32_t read_ptr;
	uint32_t write_ptr;
	SyncSemaphore sync_sems[SYNC_SEMAPHORES];
	Mutex *mutex;
	Semaphore *sync;
	
	
	template<class T>
	T* allocate() {
	
		// alloc size is size+T+safeguard
		uint32_t alloc_size=sizeof(T)+sizeof(uint32_t);
		
		tryagain:
		
		if (write_ptr < read_ptr) {
			// behind read_ptr, check that there is room
			if ( (read_ptr-write_ptr) <= alloc_size )
				return NULL;
		} else if (write_ptr >= read_ptr) {
			// ahead of read_ptr, check that there is room
			
			
			if ( (COMMAND_MEM_SIZE-write_ptr) < alloc_size+4 ) {
				// no room at the end, wrap down;
				
				if (read_ptr==0) // dont want write_ptr to become read_ptr
					return NULL;
					
				// if this happens, it's a bug
				ERR_FAIL_COND_V( (COMMAND_MEM_SIZE-write_ptr) < sizeof(uint32_t), NULL );
				// zero means, wrap to begining

				uint32_t * p = (uint32_t*)&command_mem[write_ptr];
				*p=0;
				write_ptr=0;
				goto tryagain;
			}
		}
		// allocate the size
		uint32_t * p = (uint32_t*)&command_mem[write_ptr];
		*p=sizeof(T);
		write_ptr+=sizeof(uint32_t);
		// allocate the command
		T* cmd = memnew_placement( &command_mem[write_ptr], T );
		write_ptr+=sizeof(T);
		return cmd;
	
	}
	
	template<class T>
	T* allocate_and_lock() {
	
		lock();
		T* ret;
		
		while ( (ret=allocate<T>())==NULL ) {
		
			unlock();
			// sleep a little until fetch happened and some room is made			
			wait_for_flush();
			lock();
			
		}
				
		return ret;
	}
	
	
	bool flush_one() {
	
		tryagain:
		
		// tried to read an empty queue
		if (read_ptr == write_ptr )
			return false;
		
		uint32_t size = *(uint32_t*)( &command_mem[read_ptr] );
		
		if (size==0) {
			//end of ringbuffer, wrap
			read_ptr=0;
			goto tryagain;
		}
		
		read_ptr+=sizeof(uint32_t);
		
		CommandBase *cmd = reinterpret_cast<CommandBase*>( &command_mem[read_ptr] );
		
		cmd->call();
		cmd->~CommandBase();
		
		read_ptr+=size;		

		return true;
	}
	
	
	void lock();
	void unlock();
	void wait_for_flush();
	SyncSemaphore* _alloc_sync_sem();
	
	
public:

	/* NORMAL PUSH COMMANDS */
	
	template<class T, class M>
	void push( T * p_instance, M p_method ) {
	
		Command0<T,M> * cmd = allocate_and_lock< Command0<T,M> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		
		unlock();
		
		if (sync) sync->post();
	}

	template<class T, class M, class P1>
	void push( T * p_instance, M p_method, P1 p1 ) {
	
		Command1<T,M,P1> * cmd = allocate_and_lock< Command1<T,M,P1> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		
		unlock();
		
		if (sync) sync->post();
	}

	template<class T, class M, class P1, class P2>
	void push( T * p_instance, M p_method, P1 p1, P2 p2 ) {
	
		Command2<T,M,P1,P2> * cmd = allocate_and_lock< Command2<T,M,P1,P2> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		
		unlock();
		
		if (sync) sync->post();
	}

	template<class T, class M, class P1, class P2, class P3>
	void push( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3 ) {
	
		Command3<T,M,P1,P2,P3> * cmd = allocate_and_lock< Command3<T,M,P1,P2,P3> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		
		unlock();
		
		if (sync) sync->post();
	}

	template<class T, class M, class P1, class P2, class P3, class P4>
	void push( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4 ) {
	
		Command4<T,M,P1,P2,P3,P4> * cmd = allocate_and_lock< Command4<T,M,P1,P2,P3,P4> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		
		unlock();
		
		if (sync) sync->post();
	}

	template<class T, class M, class P1, class P2, class P3, class P4, class P5>
	void push( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5 ) {
	
		Command5<T,M,P1,P2,P3,P4,P5> * cmd = allocate_and_lock< Command5<T,M,P1,P2,P3,P4,P5> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		cmd->p5=p5;
		
		unlock();
		
		if (sync) sync->post();
	}

	template<class T, class M, class P1, class P2, class P3, class P4, class P5, class P6>
	void push( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6 ) {
	
		Command6<T,M,P1,P2,P3,P4,P5,P6> * cmd = allocate_and_lock< Command6<T,M,P1,P2,P3,P4,P5,P6> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		cmd->p5=p5;
		cmd->p6=p6;
		
		unlock();
		
		if (sync) sync->post();
	}

	template<class T, class M, class P1, class P2, class P3, class P4, class P5, class P6, class P7>
	void push( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7 ) {
	
		Command7<T,M,P1,P2,P3,P4,P5,P6,P7> * cmd = allocate_and_lock< Command7<T,M,P1,P2,P3,P4,P5,P6,P7> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		cmd->p5=p5;
		cmd->p6=p6;
		cmd->p7=p7;
		
		unlock();
		
		if (sync) sync->post();
	}
	/*** PUSH AND RET COMMANDS ***/
	
	
	template<class T, class M,class R>
	void push_and_ret( T * p_instance, M p_method, R* r_ret) {
	
		CommandRet0<T,M,R> * cmd = allocate_and_lock< CommandRet0<T,M,R> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->ret=r_ret;
		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();
		
		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1,class R>
	void push_and_ret( T * p_instance, M p_method, P1 p1, R* r_ret) {
	
		CommandRet1<T,M,P1,R> * cmd = allocate_and_lock< CommandRet1<T,M,P1,R> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->ret=r_ret;
		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;
		
		unlock();
		
		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2,class R>
	void push_and_ret( T * p_instance, M p_method, P1 p1, P2 p2, R* r_ret) {
	
		CommandRet2<T,M,P1,P2,R> * cmd = allocate_and_lock< CommandRet2<T,M,P1,P2,R> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->ret=r_ret;
		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();
		
		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2, class P3,class R>
	void push_and_ret( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, R* r_ret ) {
	
		CommandRet3<T,M,P1,P2,P3,R> * cmd = allocate_and_lock< CommandRet3<T,M,P1,P2,P3,R> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->ret=r_ret;
		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();
		
		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2, class P3, class P4,class R>
	void push_and_ret( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4, R* r_ret ) {
	
		CommandRet4<T,M,P1,P2,P3,P4,R> * cmd = allocate_and_lock< CommandRet4<T,M,P1,P2,P3,P4,R> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		cmd->ret=r_ret;
		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();
		
		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2, class P3, class P4, class P5,class R>
	void push_and_ret( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, R* r_ret ) {
	
		CommandRet5<T,M,P1,P2,P3,P4,P5,R> * cmd = allocate_and_lock< CommandRet5<T,M,P1,P2,P3,P4,P5,R> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		cmd->p5=p5;
		cmd->ret=r_ret;
		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();
		
		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2, class P3, class P4, class P5, class P6,class R>
	void push_and_ret( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, R* r_ret ) {
	
		CommandRet6<T,M,P1,P2,P3,P4,P5,P6,R> * cmd = allocate_and_lock< CommandRet6<T,M,P1,P2,P3,P4,P5,P6,R> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		cmd->p5=p5;
		cmd->p6=p6;
		cmd->ret=r_ret;
		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();
		
		if (sync) sync->post();
		ss->sem->wait();
	}
	
	template<class T, class M, class P1, class P2, class P3, class P4, class P5, class P6,class P7,class R>
	void push_and_ret( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6,P7 p7, R* r_ret ) {
	
		CommandRet7<T,M,P1,P2,P3,P4,P5,P6,P7,R> * cmd = allocate_and_lock< CommandRet7<T,M,P1,P2,P3,P4,P5,P6,P7,R> >();
		
		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		cmd->p5=p5;
		cmd->p6=p6;
		cmd->p7=p7;
		cmd->ret=r_ret;
		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();
		
		if (sync) sync->post();
		ss->sem->wait();
	}


	template<class T, class M>
	void push_and_sync( T * p_instance, M p_method) {

		CommandSync0<T,M> * cmd = allocate_and_lock< CommandSync0<T,M> >();

		cmd->instance=p_instance;
		cmd->method=p_method;

		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();

		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1>
	void push_and_sync( T * p_instance, M p_method, P1 p1) {

		CommandSync1<T,M,P1> * cmd = allocate_and_lock< CommandSync1<T,M,P1> >();

		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;

		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();

		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2>
	void push_and_sync( T * p_instance, M p_method, P1 p1, P2 p2) {

		CommandSync2<T,M,P1,P2> * cmd = allocate_and_lock< CommandSync2<T,M,P1,P2> >();

		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;

		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();

		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2, class P3>
	void push_and_sync( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3 ) {

		CommandSync3<T,M,P1,P2,P3> * cmd = allocate_and_lock< CommandSync3<T,M,P1,P2,P3> >();

		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;

		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();

		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2, class P3, class P4>
	void push_and_sync( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4 ) {

		CommandSync4<T,M,P1,P2,P3,P4> * cmd = allocate_and_lock< CommandSync4<T,M,P1,P2,P3,P4> >();

		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;

		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();

		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2, class P3, class P4, class P5>
	void push_and_sync( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5 ) {

		CommandSync5<T,M,P1,P2,P3,P4,P5> * cmd = allocate_and_lock< CommandSync5<T,M,P1,P2,P3,P4,P5> >();

		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		cmd->p5=p5;

		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();

		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2, class P3, class P4, class P5, class P6>
	void push_and_sync( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6 ) {

		CommandSync6<T,M,P1,P2,P3,P4,P5,P6> * cmd = allocate_and_lock< CommandSync6<T,M,P1,P2,P3,P4,P5,P6> >();

		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		cmd->p5=p5;
		cmd->p6=p6;

		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();

		if (sync) sync->post();
		ss->sem->wait();
	}

	template<class T, class M, class P1, class P2, class P3, class P4, class P5, class P6,class P7>
	void push_and_sync( T * p_instance, M p_method, P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6,P7 p7 ) {

		CommandSync7<T,M,P1,P2,P3,P4,P5,P6,P7> * cmd = allocate_and_lock< CommandSync7<T,M,P1,P2,P3,P4,P5,P6,P7> >();

		cmd->instance=p_instance;
		cmd->method=p_method;
		cmd->p1=p1;
		cmd->p2=p2;
		cmd->p3=p3;
		cmd->p4=p4;
		cmd->p5=p5;
		cmd->p6=p6;
		cmd->p7=p7;

		SyncSemaphore *ss=_alloc_sync_sem();
		cmd->sync=ss;

		unlock();

		if (sync) sync->post();
		ss->sem->wait();
	}

	void wait_and_flush_one() {
		ERR_FAIL_COND(!sync);
		sync->wait();
		lock();
		flush_one();		
		unlock();
	}
	
	void flush_all() {
			
		ERR_FAIL_COND(sync);
		lock();
		while (true) {
			bool exit = !flush_one();
			if (exit)
				break;
		}
		unlock();
	}
	
	CommandQueueMT(bool p_sync);
	~CommandQueueMT();
	
};

#endif