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eafa8a32bb
Define a new watcher type into list module. This type is similar to bref and can be used to register an element which is currently tracking a dynamic target. Contrary to bref, if the target is freed, every watcher element are updated to point to a next valid entry or NULL. This type will simplify handling of dynamic servers deletion, in particular while stats dump are performed. This patch is not a bug-fix. However, it is mandatory to fix a race condition in dynamic servers. Thus, it should be backported along the next commit up to 2.6.