1 files changed, 24 insertions, 0 deletions
diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
new file mode 100644
index 0000000000..0d924eea57
--- /dev/null
+++ b/test/ruby/test_thread.rb
@@ -0,0 +1,24 @@
+require 'test/unit'
+
+class TestThread < Test::Unit::TestCase
+  def test_mutex_synchronize
+    m = Mutex.new
+    r = 0
+    max = 100
+    (1..max).map{
+      Thread.new{
+        i=0
+        while i<max*max
+          i+=1
+          m.synchronize{
+            r += 1
+          }
+        end
+      }
+    }.each{|e|
+      e.join
+    }
+    assert_equal(max * max * max, r)
+  end
+end
+