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diff --git a/jni/ruby/lib/mutex_m.rb b/jni/ruby/lib/mutex_m.rb
new file mode 100644
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+++ b/jni/ruby/lib/mutex_m.rb
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+#
+#   mutex_m.rb -
+#       $Release Version: 3.0$
+#       $Revision: 1.7 $
+#       Original from mutex.rb
+#       by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#       modified by matz
+#       patched by akira yamada
+#
+# --
+
+
+require 'thread'
+
+# = mutex_m.rb
+#
+# When 'mutex_m' is required, any object that extends or includes Mutex_m will
+# be treated like a Mutex.
+#
+# Start by requiring the standard library Mutex_m:
+#
+#   require "mutex_m.rb"
+#
+# From here you can extend an object with Mutex instance methods:
+#
+#   obj = Object.new
+#   obj.extend Mutex_m
+#
+# Or mixin Mutex_m into your module to your class inherit Mutex instance
+# methods.
+#
+#   class Foo
+#     include Mutex_m
+#     # ...
+#   end
+#   obj = Foo.new
+#   # this obj can be handled like Mutex
+#
+module Mutex_m
+  def Mutex_m.define_aliases(cl) # :nodoc:
+    cl.module_eval %q{
+      alias locked? mu_locked?
+      alias lock mu_lock
+      alias unlock mu_unlock
+      alias try_lock mu_try_lock
+      alias synchronize mu_synchronize
+    }
+  end
+
+  def Mutex_m.append_features(cl) # :nodoc:
+    super
+    define_aliases(cl) unless cl.instance_of?(Module)
+  end
+
+  def Mutex_m.extend_object(obj) # :nodoc:
+    super
+    obj.mu_extended
+  end
+
+  def mu_extended # :nodoc:
+    unless (defined? locked? and
+            defined? lock and
+            defined? unlock and
+            defined? try_lock and
+            defined? synchronize)
+      Mutex_m.define_aliases(singleton_class)
+    end
+    mu_initialize
+  end
+
+  # See Mutex#synchronize
+  def mu_synchronize(&block)
+    @_mutex.synchronize(&block)
+  end
+
+  # See Mutex#locked?
+  def mu_locked?
+    @_mutex.locked?
+  end
+
+  # See Mutex#try_lock
+  def mu_try_lock
+    @_mutex.try_lock
+  end
+
+  # See Mutex#lock
+  def mu_lock
+    @_mutex.lock
+  end
+
+  # See Mutex#unlock
+  def mu_unlock
+    @_mutex.unlock
+  end
+
+  # See Mutex#sleep
+  def sleep(timeout = nil)
+    @_mutex.sleep(timeout)
+  end
+
+  private
+
+  def mu_initialize # :nodoc:
+    @_mutex = Mutex.new
+  end
+
+  def initialize(*args) # :nodoc:
+    mu_initialize
+    super
+  end
+end