Move spec/rubyspec to spec/ruby for consistency

* Other ruby implementations use the spec/ruby directory.
  [Misc #13792] [ruby-core:82287]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/core/mutex/locked_spec.rb

@@ -0,0 +1,36 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Mutex#locked?" do
+  it "returns true if locked" do
+    m = Mutex.new
+    m.lock
+    m.locked?.should be_true
+  end
+
+  it "returns false if unlocked" do
+    m = Mutex.new
+    m.locked?.should be_false
+  end
+
+  it "returns the status of the lock" do
+    m1 = Mutex.new
+    m2 = Mutex.new
+
+    m2.lock # hold th with only m1 locked
+    m1_locked = false
+
+    th = Thread.new do
+      m1.lock
+      m1_locked = true
+      m2.lock
+    end
+
+    Thread.pass until m1_locked
+
+    m1.locked?.should be_true
+    m2.unlock # release th
+    th.join
+    # A Thread releases its locks upon termination
+    m1.locked?.should be_false
+  end
+end