Author: Mark Johnson
MDL-67020 Cache: Make locking work for local file caches
* Add new requirelockingbeforewrite flag for cache definitions
* Implement native locking in cachestore_file (leveraging
file_lock_factory).
http://git.moodle.org/gw?p=moodle.git;a=commit;h=045ee091daf71f151c3fbddd7fe1fa5264900f8a
http://github.com/moodle/moodle/commit/045ee091daf71f151c3fbddd7fe1fa5264900f8a
+ 4.1 en [lockwait,cachestore_file]
+ 4.1 en [lockwait_help,cachestore_file]