lib/finitio.rb in finitio-0.7.0.pre.rc4 vs lib/finitio.rb in finitio-0.7.0

@@ -14,28 +14,30 @@
 
   IDENTITY = ->(object){ object }
 
   ANY_TYPE = AnyType.new
 
+  LOCK = Mutex.new
+
   STDLIB_PATHS = [
     File.expand_path('../finitio/stdlib', __FILE__)
   ]
 
   MEMOIZED_SYSTEMS = {}
 
-  MEMOIZATION_SEMAPHORE = Mutex.new
-
   def stdlib_path(path)
-    STDLIB_PATHS << path
+    LOCK.synchronize {
+      STDLIB_PATHS << path
+    }
   end
 
   def parse(source)
     Syntax.parse(source)
   end
 
   def system(source)
-    MEMOIZATION_SEMAPHORE.synchronize {
+    LOCK.synchronize {
       _system(source)
     }
   end
 
   def _system(source)
@@ -46,10 +48,10 @@
     end
   end
   private :_system
 
   def clear_saved_systems!
-    MEMOIZATION_SEMAPHORE.synchronize {
+    LOCK.synchronize {
       MEMOIZED_SYSTEMS.clear
     }
   end
 
   def ast(source)