1 files changed, 21 insertions, 0 deletions
diff --git a/ruby_1_9_3/benchmark/bm_vm_thread_mutex1.rb b/ruby_1_9_3/benchmark/bm_vm_thread_mutex1.rb
new file mode 100644
index 0000000000..588506e87c
--- /dev/null
+++ b/ruby_1_9_3/benchmark/bm_vm_thread_mutex1.rb
@@ -0,0 +1,21 @@
+# one thread, one mutex (no contention)
+
+require 'thread'
+m = Mutex.new
+r = 0
+max = 2000
+lmax = max * max
+(1..1).map{
+  Thread.new{
+    i=0
+    while i<lmax
+      i+=1
+      m.synchronize{
+        r += 1
+      }
+    end
+  }
+}.each{|e|
+  e.join
+}
+raise r.to_s if r != max * max