module Sqreen
  has_mono_time = begin
    Process.clock_gettime Process::CLOCK_MONOTONIC
    true
  rescue StandardError
    false
  end

  @has_thread_cpu_time = begin
    Process.clock_gettime Process::CLOCK_THREAD_CPUTIME_ID
    true
  rescue StandardError
    false
  end

  class << self
    def thread_cpu_time?
      @has_thread_cpu_time
    end
  end

  if has_mono_time
    def self.time
      Process.clock_gettime Process::CLOCK_MONOTONIC
    end
  else
    def self.time
      Time.now.to_f
    end
  end

  if @has_thread_cpu_time
    def self.thread_cpu_time
      Process.clock_gettime Process::CLOCK_THREAD_CPUTIME_ID
    end
  else
    def self.thread_cpu_time
      0
    end
  end
end