Protected +initialize from being called multiple times on GSContext because of

subclasses. 

As a result, this eliminates a gstate table memory leak, and prevents the table 
to be reset while still in use (causing various DPS errors such as invalid 
param, stack underflow and segfault).


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/back/trunk@35153 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,3 +1,13 @@
+2012-05-14  Quentin Mathe  <quentin.mathe@gmail.com>
+
+	* Source/gsc/GSContext.m (+initialize): Protected +initialize from being 
+	called multiple times because of subclasses. As a result, this 
+	eliminates a gtable memory leak (e.g. +initialize sent to both GSContext 
+	and CairoContext at backend initialization time), and prevents the 
+	gstate stack to be reset while still in use (e.g. the program enumerates 
+	classes at runtime and sends messages to them... +initialize might be 
+	sent to GSStreamContext in such a case). 
+
 2012-05-12  Eric Wasylishen  <ewasylishen@gmail.com>
 
 	* Source/x11/XIMInputServer.m: Remove the locale setting code.

Source/gsc/GSContext.m

@@ -135,8 +135,11 @@ static NSMapTable *gtable;
 
 + (void) initialize
 {
-  gtable = NSCreateMapTable(NSIntMapKeyCallBacks,
-                                 NSObjectMapValueCallBacks, 20);
+  if (self == [GSContext class])
+    {
+      gtable = NSCreateMapTable(NSIntMapKeyCallBacks,
+                                NSObjectMapValueCallBacks, 20);
+    }
 }
 
 + (void) insertObject: (id)obj forKey: (int)index