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: monotonic_gc_profiler.rb
    path of file: ./repos/newrelic-ruby-agent/lib/new_relic/agent/vm
    
    the code of the file until where you have to start completion: # This file is distributed under New Relic's license terms.
# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
# frozen_string_literal: true

# The GC::Profiler class available on MRI has to be reset periodically to avoid
# memory "leaking" in the underlying implementation. However, it's a major
# bummer for how we want to gather those statistics.
#
# This class comes to the rescue. It relies on being the only party to reset
# the underlying GC::Profiler, but otherwise gives us a steadily increasing
# total time.

module NewRelic
  module Agent
    module VM
      class MonotonicGCProfiler
        def initialize
          @total_time_s = 0
          @lock = Mutex.new
        end

        def total_time_s
          if NewRelic::LanguageSupport.gc_profiler_enabled?
            # There's a race here if the next two lines don't e
    
        def total_time_s
          if NewRelic::LanguageSupport.gc_profiler_enabled?
            # There's a race here if the next two lines don't execute as an atomic
            # unit - we may end up double-counting some GC time in that scenario.
            # Locking around them guarantees atomicity of the read/increment/reset
            # sequence.
            @lock.synchronize do
              # The Ruby 1.9.x docs claim that GC::Profiler.total_time returns
              # a value in milliseconds. They are incorrect - both 1.9.x and 2.x
              # return values in seconds.
              @total_time_s += ::GC::Profiler.total_time
              ::GC::Profiler.clear
            end
          else
            NewRelic::Agent.logger.log_once(:warn, :gc_profiler_disabled,
              'Tried to measure GC time, but GC::Profiler was not enabled.')
          end

          @total_time_s
        end
      end
    end