Contents

# frozen_string_literal: true

module Datadog
  module Profiling
    module Collectors
      # Used to trigger sampling of threads, based on external "events", such as:
      # * periodic timer for cpu-time and wall-time
      # * VM garbage collection events
      # * VM object allocation events
      # Triggering of this component (e.g. watching for the above "events") is implemented by
      # Collectors::CpuAndWallTimeWorker.
      # The stack collection itself is handled using the Datadog::Profiling::Collectors::Stack.
      # Almost all of this class is implemented as native code.
      #
      # Methods prefixed with _native_ are implemented in `collectors_thread_context.c`
      class ThreadContext
        def initialize(recorder:, max_frames:, tracer:)
          tracer_context_key = safely_extract_context_key_from(tracer)
          self.class._native_initialize(self, recorder, max_frames, tracer_context_key)
        end

        def inspect
          # Compose Ruby's default inspect with our custom inspect for the native parts
          result = super()
          result[-1] = "#{self.class._native_inspect(self)}>"
          result
        end

        def reset_after_fork
          self.class._native_reset_after_fork(self)
        end

        private

        def safely_extract_context_key_from(tracer)
          provider = tracer && tracer.respond_to?(:provider) && tracer.provider

          return unless provider

          context = provider.instance_variable_get(:@context)
          context && context.instance_variable_get(:@key)
        end
      end
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
ddtrace-1.10.1	lib/datadog/profiling/collectors/thread_context.rb
ddtrace-1.10.0	lib/datadog/profiling/collectors/thread_context.rb