Fix for AWS::S3 thread safety issues

gistfile1.rb

require 'aws/s3'

class D7Obj < AWS::S3::S3Object
    set_current_bucket_to "kd-test"
end 

class S3Handler

      AWS::S3::Base.establish_connection!(
        :access_key_id     => 'ID',
        :secret_access_key => 'SECRET',
        :persistent => true
      )
    
    def connected
      if AWS::S3::Base.connected? == true
        return true
      else
        return false
      end
    end
        
    def save_file(file, filename, access_level = "public-read")  
        return D7Obj.store(filename, file, :access => :public_read) unless connected == false
    end
    
  end
    
  s3 = S3Handler.new

semaphore = Mutex.new

threads = []
5.times { |i|
  threads << Thread.new(i) {
    semaphore.synchronize do
  	s3 = S3Handler.new
  	s3.save_file(open('./Downloads/test.jpg'), "#{i}.jpg")
  	puts("finished saving file #{i}.jpg")
    end
  }
}
threads.each {|t| t.join }