RFR (S): CR 8005926: (thread) Merge ThreadLocalRandom state into java.lang.Thread

[Chris Hegarty]

On 14 Jan 2013, at 22:53, Aleksey Shipilev <aleksey.shipilev at oracle.com> wrote:

> On 01/15/2013 02:47 AM, Chris Hegarty wrote:
>> 
>> On 14 Jan 2013, at 22:33, Aleksey Shipilev <aleksey.shipilev at oracle.com> wrote:
>> 
>>> On 01/15/2013 02:17 AM, Alan Bateman wrote:
>>>> The other thing I notice is that the serialized form of the original
>>>> ThreadLocalRandom included the padding fields, I guess they should have
>>>> been transient in the original implementation.
>>> 
>>> Damn. These *are* the part of TLR serialized form :(
>>> http://docs.oracle.com/javase/7/docs/api/serialized-form.html#java.util.concurrent.ThreadLocalRandom
>>> 
>>> Also, the class changes probably screwed up the SUID. I think we need to
>>> get the padding back (which should not be the problem since TLR is now a
>>> singleton, and add the SUID with the previous value.
>> 
>> Or serialPersistentFields? I was thinking of this anyway, so we could get rid of rnd.
> 
> I'm not sure what we are saving here. Since new TLR is a singleton, we
> save ~64 bytes per classloader. Worth messing with advanced
> serialization mechanics? Probably not. I'll publish a revised webrev soon.

serialPersistentFields is really quite simple, and will help avoid any potential issues like this in the future. I can help implement this on top of your patch if you like.

-Chris.

> 
> -Aleksey.
> 
>