Backport thread-local variables from Ruby 2.0

1 files changed, 77 insertions, 0 deletions

diff --git a/activesupport/test/core_ext/thread_test.rb b/activesupport/test/core_ext/thread_test.rb
new file mode 100644
index 0000000000..b58f59a8d4
--- /dev/null
+++ b/activesupport/test/core_ext/thread_test.rb
@@ -0,0 +1,77 @@
+require 'abstract_unit'
+require 'active_support/core_ext/thread'
+
+class ThreadExt < ActiveSupport::TestCase
+  def test_main_thread_variable_in_enumerator
+    assert_equal Thread.main, Thread.current
+
+    Thread.current.thread_variable_set :foo, "bar"
+
+    thread, value = Fiber.new {
+      Fiber.yield [Thread.current, Thread.current.thread_variable_get(:foo)]
+    }.resume
+
+    assert_equal Thread.current, thread
+    assert_equal Thread.current.thread_variable_get(:foo), value
+  end
+
+  def test_thread_variable_in_enumerator
+    Thread.new {
+      Thread.current.thread_variable_set :foo, "bar"
+
+      thread, value = Fiber.new {
+        Fiber.yield [Thread.current, Thread.current.thread_variable_get(:foo)]
+      }.resume
+
+      assert_equal Thread.current, thread
+      assert_equal Thread.current.thread_variable_get(:foo), value
+    }.join
+  end
+
+  def test_thread_variables
+    assert_equal [], Thread.new { Thread.current.thread_variables }.join.value
+
+    t = Thread.new {
+      Thread.current.thread_variable_set(:foo, "bar")
+      Thread.current.thread_variables
+    }
+    assert_equal [:foo], t.join.value
+  end
+
+  def test_thread_variable?
+    refute Thread.new { Thread.current.thread_variable?("foo") }.join.value
+    t = Thread.new {
+      Thread.current.thread_variable_set("foo", "bar")
+    }.join
+
+    assert t.thread_variable?("foo")
+    assert t.thread_variable?(:foo)
+    refute t.thread_variable?(:bar)
+  end
+
+  def test_thread_variable_strings_and_symbols_are_the_same_key
+    t = Thread.new {}.join
+    t.thread_variable_set("foo", "bar")
+    assert_equal "bar", t.thread_variable_get(:foo)
+  end
+
+  def test_thread_variable_frozen
+    t = Thread.new { }.join
+    t.freeze
+    assert_raises(RuntimeError) do
+      t.thread_variable_set(:foo, "bar")
+    end
+  end
+
+  def test_thread_variable_security
+    t = Thread.new { sleep }
+
+    assert_raises(SecurityError) do
+      Thread.new { $SAFE = 4; t.thread_variable_get(:foo) }.join
+    end
+
+    assert_raises(SecurityError) do
+      Thread.new { $SAFE = 4; t.thread_variable_set(:foo, :baz) }.join
+    end
+  end
+end