spec/ruby/core/thread/native_thread_id_spec.rb


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require_relative '../../spec_helper'

platform_is :linux, :darwin, :windows, :freebsd do
  describe "Thread#native_thread_id" do
    it "returns an integer when the thread is alive" do
      Thread.current.native_thread_id.should be_kind_of(Integer)
    end

    it "returns nil when the thread is not running" do
      t = Thread.new {}
      t.join
      t.native_thread_id.should == nil
    end

    it "each thread has different native thread id" do
      t = Thread.new { sleep }
      Thread.pass until t.stop?
      main_thread_id = Thread.current.native_thread_id
      t_thread_id = t.native_thread_id

      if ruby_version_is "3.3"
        # native_thread_id can be nil on a M:N scheduler
        t_thread_id.should be_kind_of(Integer) if t_thread_id != nil
      else
        t_thread_id.should be_kind_of(Integer)
      end

      main_thread_id.should_not == t_thread_id

      t.run
      t.join
      t.native_thread_id.should == nil
    end
  end
end