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/unlock_spec.rb

@@ -0,0 +1,38 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Mutex#unlock" do
+  it "raises ThreadError unless Mutex is locked" do
+    mutex = Mutex.new
+    lambda { mutex.unlock }.should raise_error(ThreadError)
+  end
+
+  it "raises ThreadError unless thread owns Mutex" do
+    mutex = Mutex.new
+    wait = Mutex.new
+    wait.lock
+    th = Thread.new do
+      mutex.lock
+      wait.lock
+    end
+
+    # avoid race on mutex.lock
+    Thread.pass until mutex.locked?
+    Thread.pass while th.status and th.status != "sleep"
+
+    lambda { mutex.unlock }.should raise_error(ThreadError)
+
+    wait.unlock
+    th.join
+  end
+
+  it "raises ThreadError if previously locking thread is gone" do
+    mutex = Mutex.new
+    th = Thread.new do
+      mutex.lock
+    end
+
+    th.join
+
+    lambda { mutex.unlock }.should raise_error(ThreadError)
+  end
+end