[Bacula-devel] CVS users advisory

[Kern S. <ke...@su...>]

Hello,

For those of you pulling from the CVS, please take note that with version 
1.37.20 just now committed, I have radically modified the locking mechanism 
for the Job chain.  Instead of being globally locked, it is locked during 
each operation that modifies or traverses the queue.  This has the enormous 
advantage of nearly eliminating the risk of a deadlock at the price of 
locking/unlocking on each access to the list rather than once at the 
beginning and end of accessing the list.  It also has the advantage that 
multiple processes can access the list at the same time rather than blocking.

I've tested the new code numerous times here, but to be really sure, it will 
take much more testing, including testing on a SMP, which I will do this 
weekend.

Hopefully, this will eliminate 99% of all cases of deadlocks involving the jcr 
chain such as bug 331.

-- 
Best regards,

Kern

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