Subj : Re: AppCore updates and performance enhancements added...
To   : comp.programming.threads
From : Chris Thomasson
Date : Tue May 10 2005 03:32 pm

I found and fixed the last bug in AppCore wrt SMR and the node cache. 
AppCore should now be basically bug free, I am currently verifying that. You 
should probably re-download. Again, the bug is very subtle hard to trip. It 
had to do with the way the lock-free single-producer/consumer queue 
allocated its very first dummy node. The broken code simple did not set the 
fp_dtor member of the dummy node to null. Stupid me!!!


Here is how you would reproduce it:

1. create a new queue object

2. enqueue/dequeue an object with Thread A

3. pop the bad node from the cache in Thread A

4. collect the bad node into Thread A SMR cache

5. join and/or scan Thread A SMR cache

6. SMR scanner can sometimes crash when it iterates over the bad node by 
calling a corrupted deferred callback function pointer, if it does goto step 
7

7. BOOM!


:(...



Sorry!

.