1 files changed, 15 insertions, 0 deletions
diff --git a/jni/ruby/prelude.rb b/jni/ruby/prelude.rb
new file mode 100644
index 0000000..cc24a81
--- /dev/null
+++ b/jni/ruby/prelude.rb
@@ -0,0 +1,15 @@
+class Thread
+  MUTEX_FOR_THREAD_EXCLUSIVE = Mutex.new # :nodoc:
+
+  # call-seq:
+  #    Thread.exclusive { block }   => obj
+  #
+  # Wraps the block in a single, VM-global Mutex.synchronize, returning the
+  # value of the block. A thread executing inside the exclusive section will
+  # only block other threads which also use the Thread.exclusive mechanism.
+  def self.exclusive
+    MUTEX_FOR_THREAD_EXCLUSIVE.synchronize{
+      yield
+    }
+  end
+end