How are the object_ids generated/assigned to objects?

Ruby
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 S. 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.

3

On Sat, 26 Aug 2006, Pavel S. 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.

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
4344
5428
5428
5428
5428
6510
6510
6510
6510

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

cheers.

-a

4

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