Synchronize console operations

SMILEBASIC/console.d

@@ -100,12 +100,15 @@ class Console
     GraphicPage GRPF;
     PetitComputer petitcom;
     bool[2] visibles = [true, true];
+    Object consoleSync = new Object();
 
     int width()
     {
         return fontWidth;
     }
     void width(int w)
+    {
+        synchronized(this)
         {
             fontWidth = fontHeight = w;
             consoleWidth = petitcom.screenWidth / fontWidth;
@@ -138,6 +141,7 @@ class Console
             CSRZs[] = 0;
             display(petitcom.displaynum);
         }
+    }
     bool visible()
     {
         return visibles[petitcom.displaynum];
@@ -213,6 +217,8 @@ class Console
         CSRZ = 0;
     }
     void display(int number)
+    {
+        synchronized(this)
         {
             if(petitcom.xscreenmode == 2)
             {
@@ -232,6 +238,7 @@ class Console
             consoleWidthC = consoleWidth;
             consoleC = console;
         }
+    }
     void drawCharacter(int x, int y, ConsoleCharacter ch)
     {
         import std.algorithm.mutation : swap;
@@ -310,6 +317,8 @@ class Console
         {
             glLoadIdentity();
         }
+        synchronized(this)
+        {
             if(petitcom.xscreenmode == 2 && (visibles[0] || showCursor)/*XSCREEN4*/)
             {
                 glBindTexture(GL_TEXTURE_2D, GRPF.glTexture);
@@ -430,6 +439,7 @@ class Console
                 glEnd();
             }
         }
+    }
     void print(T...)(T args)
     {
         foreach(i; args)