[RFC]: fix for recycled thread ids

[Jeff Johnston]

Daniel Jacobowitz wrote:
> On Fri, Mar 19, 2004 at 02:35:40PM -0500, Jeff Johnston wrote:
> 
>>>Conceptually, we attach to LWPs, not to threads.  That suggests to me
>>>that the correct fix is to ask the LWP layer if the LWP is attached
>>>rather than looking it up in the thread list in the first place. 
>>>We've already got an appropriate list of LWPs though we might need a
>>>new accessor.
>>>
>>
>>I like that idea.  We still have to deal with the bogus thread list entry.  
>>The routine prune_threads calls thread_db_alive and it won't realize the 
>>thread info it has is bogus because it will find the tid is valid.
> 
> 
> Do you think this will be a problem?  My hope is that it will just look
> as if the thread has 'migrated' to a new LWP.
> 

It will have invalid state associated with it.  For example, the thread info has 
a prev_pc field.  As to all the havoc that the state may or may not cause, I 
think it would be a very good idea to clean it up now.  Who's to say what state 
will be added to thread_info in the future.

-- Jeff J.