allocate_request_id(host, port) public

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# File lib/resolv.rb, line 572
    def self.allocate_request_id(host, port) # :nodoc:
      id = nil
      RequestIDMutex.synchronize {
        h = (RequestID[[host, port]] ||= {})
        begin
          id = rangerand(0x0000..0xffff)
        end while h[id] 
        h[id] = true
      }
      id
    end
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