From: James Britt <james_b@...>
Date: 2005-05-10T22:13:53+09:00
Subject: Re: No Thing Here vs Uninitialized and RCR 303

Pit Capitain wrote:
> James Britt schrieb:
> 
>> If you change the behavior of NilClass (e.g., NilClass.blackhole = 
>> true) it is changed for all nil occurrences (nil is a singleton 
>> object, so there is only one instance).
>>
>> If there are multiple threads running, and one of them decides 
>> NilClass should swallow all unknown methods (even if only during the 
>> execution of a specific block) then all processes will see the same 
>> behavior until some code sets NilClass.blackhole = false.
> 
> 
> I don't know whether this would be useful, but you can use thread-local 
> variables [1] to make this behavior dependent on the current thread. I 
> can send you the code, if you like.

You can change the workings of a singleton class (NilClass) such that it 
behaves differently in separate, simultaneous threads?


James