* thread.c (thread_start_func_2): don't interrupt when last thread exit

  unless main thread is already exited. Otherwise main thread could be
  wrongly interrupted when it uses rb_thread_call_without_gvl(). Patch
  by Takehiro Kubo. [Bug #11237][ruby-dev:49044][GH-898]
* test/-ext-/gvl/test_last_thread.rb: new test for the above fix.
* ext/-test-/gvl/call_without_gvl/call_without_gvl.c: new ext for the
  above test.
* ext/-test-/gvl/call_without_gvl/extconf.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50900 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 22 insertions, 0 deletions

diff --git a/test/-ext-/gvl/test_last_thread.rb b/test/-ext-/gvl/test_last_thread.rb
new file mode 100644
index 0000000000..df25165b4b
--- /dev/null
+++ b/test/-ext-/gvl/test_last_thread.rb
@@ -0,0 +1,22 @@
+class TestLastThread < Test::Unit::TestCase
+
+  # [Bug #11237]
+  def test_last_thread
+
+    assert_separately([], <<-"end;") #do
+      require '-test-/gvl/call_without_gvl'
+
+      Thread.new {
+        sleep 0.2
+      }
+
+      t0 = Time.now
+      Thread.current.__runnable_sleep__ 1
+      t1 = Time.now
+      t = t1 - t0
+
+      assert_operator(t, :>=, 1)
+    end;
+  end
+end
+