[ruby-dev:49240] [Ruby trunk - Bug #11496] [Open] Mutex#synchronize testing code should be data race.

Issue #11496 has been reported by Yuki Kurihara.

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Bug #11496: Mutex#synchronize testing code should be data race.
https://bugs.ruby-lang.org/issues/11496

* Author: Yuki Kurihara
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0dev (2015-08-28 trunk 51715) [x86_64-darwin14]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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Current Mutex#synchronize testing code is not to fail every time if not use Mutex#synchronize.

~~~ruby
100.times {
  r = 0
  max = 10
  (1..max).map{
    Thread.new{
      i=0
      while i<max*max
        i+=1
        r += 1
      end
    }
  }.each{|e|
    e.join
  }
  raise unless r == 1000
}
puts "pass"
~~~

So, I propose this patch.

---Files--------------------------------
mutex-synchronize.patch (424 Bytes)


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