Lock
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Provide an high-level applicative locking API.
Core provides, in lock.inc file a low-level locking framework for basic and technical-related maintenance operations, such as cache rebuild; This module intends to provide a high-level applicative locking API for business modules.
A good example of applicative lock would be, for example, locking the node form. If a user locked it, any other user cannot access it, but if the user that locked it wants to fetch it back from another place, another browser and session, you can let it happen.
