<commit_before>module VCR
  module Middleware
    class Rack
      include Common

      def call(env)
        Thread.exclusive do
          VCR.use_cassette(*cassette_arguments(env)) do
            @app.call(env)
          end
        end
      end
    end
  end
end<commit_msg>Use a mutex rather than Thread.exclusive.<commit_after>module VCR
  module Middleware
    class Rack
      include Common

      def initialize(*args)
        @mutex = Mutex.new
        super
      end

      def call(env)
        @mutex.synchronize do
          VCR.use_cassette(*cassette_arguments(env)) do
            @app.call(env)
          end
        end
      end
    end
  end
end
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{'dir': 'git-commits-cleaned', 'id': '5294057', 'n_tokens_mistral': 207, 'n_tokens_neox': 203, 'n_words': 52}