diff --git a/include/xSDL.h b/include/xSDL.h
index 78e9e0d..2f3de5e 100644
--- a/include/xSDL.h
+++ b/include/xSDL.h
@@ -4,7 +4,7 @@
 	#include "../xSDL/xOrchestrable.h"
 	#include "../xSDL/xApplication.h"
 	#include "../xSDL/xController.h"
-	#include "../xSDL/xElement.h"
+	#include "../xSDL/xDrawable.h"
 	#include "../xSDL/xSprite.h"
 
 #endif
\ No newline at end of file
diff --git a/xSDL/xApplication.cpp b/xSDL/xApplication.cpp
index bd6f6b5..25a5045 100644
--- a/xSDL/xApplication.cpp
+++ b/xSDL/xApplication.cpp
@@ -139,7 +139,7 @@ bool xApplication::setImage(const char *url){
 
 
 // 	// Anti conflit inter-thread
-// 	_mutex_hit.try_lock();
+// 	_mutex_hit.lock();
 
 // 	/* (1) On recupere le SDL_Rect destination du sprite courant */
 // 	int xIndex = -1;
@@ -224,7 +224,7 @@ bool xApplication::setImage(const char *url){
 // bool xApplication::hit(string current, int movex, int movey){
 // 	if( !this->status() ) return true;
 
-// 	_mutex_hit.try_lock();
+// 	_mutex_hit.lock();
 
 // 	/* (1) On recupere le SDL_Rect destination du sprite courant */
 // 	xSprite *sprite = NULL;
@@ -245,29 +245,29 @@ bool xApplication::setImage(const char *url){
 
 
 /** adds new sprite to draw */
-void xApplication::push(xElement* sprite){
-	_mutex_draw.try_lock();
+void xApplication::push(xDrawable* sprite){
+	_mutex_draw.lock();
 	_sprites.insert(sprite);
 	_mutex_draw.unlock();
 }
 
 /** removes a sprite to draw (from its address) */
-void xApplication::pull(xElement* sprite){
-	_mutex_draw.try_lock();
+void xApplication::pull(xDrawable* sprite){
+	_mutex_draw.lock();
 	_sprites.erase(sprite);
 	_mutex_draw.unlock();
 }
 
 /** clears the scene */
 void xApplication::clear(){
-	_mutex_draw.try_lock();
+	_mutex_draw.lock();
 	_sprites.clear();
 	_mutex_draw.unlock();
 }
 
 /** Update the scene */
 void xApplication::render(){
-	_mutex_draw.try_lock();
+	_mutex_draw.lock();
 
 	/* 1. clear scene */
 	SDL_RenderClear(_renderer);
@@ -281,9 +281,9 @@ void xApplication::render(){
 
 
 	/* 4. draw every sprite */
-	set<xElement*>::iterator it;
+	set<xDrawable*>::iterator it;
 	for( it = _sprites.begin() ; it != _sprites.end() ; it++ ){
-		xElement* sprite = *it;
+		xDrawable* sprite = *it;
 		sprite->draw(_renderer);
 	}
 
@@ -308,7 +308,7 @@ void xApplication::schedule(){
 	const uint32_t ticks = SDL_GetTicks();
 
 	// trigger tick() on registered orchestrables
-	_mutex_orchestrate.try_lock();
+	_mutex_orchestrate.lock();
 	set<xOrchestrable*>::iterator it;
 	for( it = _orchestrables.begin() ; it != _orchestrables.end() ; it++ ){
 		xOrchestrable* orchestrable = *it;
@@ -324,13 +324,13 @@ void xApplication::schedule(){
 }
 
 void xApplication::addOrchestrable(xOrchestrable* o){
-	_mutex_orchestrate.try_lock();
+	_mutex_orchestrate.lock();
 	_orchestrables.insert(o);
 	_mutex_orchestrate.unlock();
 }
 
 void xApplication::removeOrchestrable(xOrchestrable* o){
-	_mutex_orchestrate.try_lock();
+	_mutex_orchestrate.lock();
 	_orchestrables.erase(o);
 	_mutex_orchestrate.unlock();
 }
diff --git a/xSDL/xApplication.h b/xSDL/xApplication.h
index bf47dd2..bf0b409 100644
--- a/xSDL/xApplication.h
+++ b/xSDL/xApplication.h
@@ -9,7 +9,7 @@
 	#include <mutex>
 	#include <thread>
 	#include <stdexcept>
-	#include "xElement.h"
+	#include "xDrawable.h"
 	#include "xController.h"
 	#include "xOrchestrable.h"
 	using namespace std;
@@ -41,8 +41,8 @@
 			// bool hit(string current, int movex=0, int movey=0);  // Gestion des collisions
 
 			/** scene */
-			void push(xElement* sprite);
-			void pull(xElement *sprite);
+			void push(xDrawable* sprite);
+			void pull(xDrawable *sprite);
 			void clear();
 
 			void render();
@@ -71,7 +71,7 @@
 			xController _controller;
 
 			// sprites
-			set<xElement*> _sprites;
+			set<xDrawable*> _sprites;
 
 			// execution pool
 			set<xOrchestrable*> _orchestrables;
diff --git a/xSDL/xDrawable.cpp b/xSDL/xDrawable.cpp
new file mode 100644
index 0000000..aa8604c
--- /dev/null
+++ b/xSDL/xDrawable.cpp
@@ -0,0 +1 @@
+#include "xDrawable.h"
\ No newline at end of file
diff --git a/xSDL/xElement.h b/xSDL/xDrawable.h
similarity index 82%
rename from xSDL/xElement.h
rename to xSDL/xDrawable.h
index 76eaadf..cd53932 100644
--- a/xSDL/xElement.h
+++ b/xSDL/xDrawable.h
@@ -3,7 +3,7 @@
 
 	#include "SDL.h"
 
-	struct xElement {
+	struct xDrawable {
 		virtual void draw(SDL_Renderer* renderer) = 0;
 	};
 
diff --git a/xSDL/xElement.cpp b/xSDL/xElement.cpp
deleted file mode 100644
index 0748c12..0000000
--- a/xSDL/xElement.cpp
+++ /dev/null
@@ -1 +0,0 @@
-#include "xElement.h"
\ No newline at end of file