add mutex for bean loading

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    smart_ioc (0.5.2)
+    smart_ioc (0.5.3)
 
 GEM
   remote: https://rubygems.org/

lib/smart_ioc/bean_factory.rb

@@ -12,7 +12,6 @@ def initialize(bean_definitions_storage, extra_package_contexts)
     @singleton_scope          = SmartIoC::Scopes::Singleton.new
     @prototype_scope          = SmartIoC::Scopes::Prototype.new
     @thread_scope             = SmartIoC::Scopes::Request.new
-    @semaphore                = Mutex.new
   end
 
   def clear_scopes

lib/smart_ioc/bean_file_loader.rb

@@ -2,6 +2,7 @@ class SmartIoC::BeanFileLoader
   def initialize
     @loaded_locations = {}
     @load_proc        = Proc.new { |location| load(location) }
+    @semaphore        = Mutex.new
   end
 
   def set_load_proc(&block)
@@ -17,7 +18,10 @@ def require_bean(bean_name)
     locations.each do |location|
       next if @loaded_locations.has_key?(location)
       @loaded_locations[location] = true
-      @load_proc.call(location)
+
+      @semaphore.synchronize do
+        @load_proc.call(location)
+      end
     end
 
     nil

lib/smart_ioc/version.rb

@@ -1,3 +1,3 @@
 module SmartIoC
-  VERSION = "0.5.2"
+  VERSION = "0.5.3"
 end