From: "Eustaquio Rangel de Oliveira Jr." <eustaquiorangel@...>
Date: 2005-05-17T04:02:23+09:00
Subject: Doubt about GC

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Hello there!

I have this program:

- -------------------------------------------------------------------------
class Car
	attr_reader :number
	def initialize(n)
		@number=n
		puts "Creating car no. #{n}:#{object_id}"
	end
	def to_s
		"Car no. #{@number}"
	end
end

def makeCar(n)
	c = Car.new(n)
end

def listCars
	puts "\nListing cars:"
	ObjectSpace.each_object(Car) {|o| puts "#{o}:#{o.object_id}"}
	puts
end

c1 = makeCar(1)
makeCar(2)
makeCar(3)

listCars()
makeCar(4)
makeCar(5)

listCars();

puts "Firing gc."
GC.start
listCars();
- -------------------------------------------------------------------------

When I run, I get:

Creating car no. 1:-604870360
Creating car no. 2:-604870370
Creating car no. 3:-604870410

Listing cars:
Car no. 3:-604870410
Car no. 2:-604870370
Car no. 1:-604870360

Creating car no. 4:-604870500
Creating car no. 5:-604870490

Listing cars:
Car no. 4:-604870500
Car no. 5:-604870490
Car no. 3:-604870410
Car no. 2:-604870370
Car no. 1:-604870360

Firing gc.

Listing cars:
Car no. 4:-604870500
Car no. 1:-604870360

My doubt is why Car no. 4 is still there, after running gc. There is no
reference to it outside the function, right? So it should not have be
sweeped by GC?

Thanks!

- ----------------------------
Eust�quio "TaQ" Rangel
eustaquiorangel@yahoo.com
http://beam.to/taq
Usu�rio GNU/Linux no. 224050
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