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diff --git a/benchmark/vm_thread_mutex2.yml b/benchmark/vm_thread_mutex2.yml
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+prelude: |
+ # two threads, one mutex
+benchmark:
+ vm_thread_mutex2: |
+
+ require 'thread'
+ m = Thread::Mutex.new
+ r = 0
+ max = 2000
+ lmax = (max * max)/2
+ (1..2).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
+loop_count: 1