Using class instance variable for mutex in Ruby

Question

Note: The code summary shown below is not a distillation of the code that I had the problem with. I\'ve left this original summary here since someo

Answer 1

Does it happen with a class variable? @@mutex. There might be a race condition with making new class-instances between threads and the new copy of @mutex isn't ready yet. Constants and class variables however, are shared between copies of the class and subclasses. Also, what if you put the @mutex init code in a memoized method such as:

def self.mutex
  @mutex ||= Mutex.new
end