1 files changed, 35 insertions, 0 deletions
diff --git a/trunk/prelude.rb b/trunk/prelude.rb
new file mode 100644
index 0000000000..fdf401b56a
--- /dev/null
+++ b/trunk/prelude.rb
@@ -0,0 +1,35 @@
+
+# Mutex
+
+class Mutex
+  def synchronize
+    self.lock
+    begin
+      yield
+    ensure
+      self.unlock rescue nil
+    end
+  end
+end
+
+# Thread
+
+class Thread
+  MUTEX_FOR_THREAD_EXCLUSIVE = Mutex.new
+  def self.exclusive
+    MUTEX_FOR_THREAD_EXCLUSIVE.synchronize{
+      yield
+    }
+  end
+end
+
+def require_relative(relative_feature)
+  c = caller.first
+  e = c.rindex(/:\d+:in /)
+  file = $`
+  if /\A\((.*)\)/ =~ file # eval, etc.
+    raise LoadError, "require_relative is called in #{$1}"
+  end
+  absolute_feature = File.expand_path(File.join(File.dirname(file), relative_feature))
+  require absolute_feature
+end