MDL-25500 lock: New locking framework.
This locking system is designed to be used everywhere requiring locking in Moodle. Each use of the locking system can be configured to use a different type of locking (or the same type with a different configuration). The first supported lock types are memcache, memcached, file (flock), db (specific handlers for pg, mysql and mariadb).
lib/classes/lock/lock.php
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