1 files changed, 39 insertions, 0 deletions
diff --git a/benchmark/vm_thread_condvar2.yml b/benchmark/vm_thread_condvar2.yml
new file mode 100644
index 0000000000..5b5798c7c5
--- /dev/null
+++ b/benchmark/vm_thread_condvar2.yml
@@ -0,0 +1,39 @@
+prelude: |
+  # many threads, one mutex, many condvars
+benchmark:
+  vm_thread_condvar2: |
+    require 'thread'
+    m = Mutex.new
+    cv1 = ConditionVariable.new
+    cv2 = ConditionVariable.new
+    max = 1000
+    n = 100
+    waiting = 0
+    scvs = []
+    waiters = n.times.map do |i|
+      start_cv = ConditionVariable.new
+      scvs << start_cv
+      start_mtx = Mutex.new
+      start_mtx.synchronize do
+        th = Thread.new(start_mtx, start_cv) do |sm, scv|
+          m.synchronize do
+            sm.synchronize { scv.signal }
+            max.times do
+              cv2.signal if (waiting += 1) == n
+              cv1.wait(m)
+            end
+          end
+        end
+        start_cv.wait(start_mtx)
+        th
+      end
+    end
+    m.synchronize do
+      max.times do
+        cv2.wait(m) until waiting == n
+        waiting = 0
+        cv1.broadcast
+      end
+    end
+    waiters.each(&:join)
+loop_count: 1