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ed35b9411a
Since a lock on the cache tree was added in the latest cache changes, we do not need to use the shared_context's lock to lock more than pure shared_context related data anymore. This already existing lock will now only cover the 'avail' list from the shared_context. It can then be changed to a rwlock instead of a spinlock because we might want to only run through the avail list sometimes. Apart form changing the type of the shctx lock, the main modification introduced by this patch is to limit the amount of code covered by the shctx lock. This lock does not need to cover any code strictly related to the cache tree anymore.