You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: share_lock.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.3/lib/active_support/concurrency
    
    the code of the file until where you have to start completion: require 'thread'
require 'monitor'

module ActiveSupport
  module Concurrency
    # A share/exclusive lock, otherwise known as a read/write lock.
    #
    # https://en.wikipedia.org/wiki/Readers%E2%80%93writer_lock
    class ShareLock
      include Monit
    
      def yield_shares(purpose: nil, compatible: [], block_share: false)
        loose_shares = previous_wait = nil
        synchronize do
          if loose_shares = @sharing.delete(Thread.current)
            if previous_wait = @waiting[Thread.current]
              purpose = nil unless purpose == previous_wait[0]
              compatible &= previous_wait[1]
            end
            compatible |= [false] unless block_share
            @waiting[Thread.current] = [purpose, compatible]
          end