1 files changed, 25 insertions, 0 deletions
diff --git a/lib/rss/prelude.rb b/lib/rss/prelude.rb
new file mode 100644
index 0000000000..8d6f70657e
--- /dev/null
+++ b/lib/rss/prelude.rb
@@ -0,0 +1,25 @@
+
+# Mutex
+
+class Mutex
+  def synchronize
+    self.lock
+    begin
+      yield
+    ensure
+      self.unlock
+    end
+  end
+end
+
+# Thread
+
+class Thread
+  MUTEX_FOR_THREAD_EXCLUSIVE = Mutex.new
+  def self.exclusive
+    MUTEX_FOR_THREAD_EXCLUSIVE.synchronize{
+      yield
+    }
+  end
+end
+