How are the object_ids generated/assigned to objects?

ruby-talk
1

Hello,

assume some multithreaded application, thread1 starts and finishes, then thread2 starts --- how is the possibility that these two threads will have the same object_id? On what it depends?

Thanks,

P.

2

Pavel Smerk wrote:

Hello,

assume some multithreaded application, thread1 starts and finishes, then thread2 starts --- how is the possibility that these two threads will have the same object_id? On what it depends?

If the first thread has stopped and been garbage collected, its object_id will be available for reuse, and it is perfectly possible for another thread to get it assigned on creation.

···

--
Alex

3

interesting question!

   harp:~ > cat a.rb
   h = {}
   loop{ tid = Thread.new{}.object_id; (warn h.size.to_s and h.delete(tid)) if h[tid]; h[tid] = true }

   harp:~ > ruby a.rb 2>&1|head
   4344
   5428
   6510

looks like they recycle every few thousand threads - depending on how long the
threads run of course.

cheers.

-a

···

On Sat, 26 Aug 2006, Pavel Smerk wrote:

Hello,

assume some multithreaded application, thread1 starts and finishes, then thread2 starts --- how is the possibility that these two threads will have the same object_id? On what it depends?

Thanks,

P.

--
to foster inner awareness, introspection, and reasoning is more efficient than
meditation and prayer.
- h.h. the 14th dalai lama

4

Treat it as undefined. No two objects live at the same time will have
the same object id. That is the only guarantee.

Pavel Smerk wrote:

···

Hello,

assume some multithreaded application, thread1 starts and finishes, then
thread2 starts --- how is the possibility that these two threads will
have the same object_id? On what it depends?

Thanks,

P.