a87c3ee Ticket 47599 - Reduce lock scope in retro changelog plug-in

Authored and Committed by mreynolds 10 years ago
    Ticket 47599 - Reduce lock scope in retro changelog plug-in
    
    Description:  Use RW locks for protecting the change numbers.
    
                  We still need to do the locking in retrocl_po.c as we need to
                  serialize the actual updates.
    
    https://fedorahosted.org/389/ticket/47599
    
    Reviewed by: richm(Thanks!!)
    (cherry picked from commit e2c42bced86bac235ac56ae98eed303f61ebd15e)