Since PHP 8.2, placing the dollar sign outside the curly brace is deprecated when
the expression inside the braces resolves to a variable or an expression.
Show performance information about locks (time taken to acquire lock,
time lock is held for) in the 'perfinfo' display.
Also show existing information (that was already calculated but not
shown before) about the session lock, which is not a 'core\lock' type
lock, but the information is similarly useful.
Removing the MySQL lock factory, the only safe way to use this MySQL API
would be to open a new DB connection for every lock. Record locking is a decent
fallback.
* A couple of misc comment typo's
* Added missing $CFG required global in file_lock_factory::is_available
* Removed unused $CFG global from file_lock_factory::get_lock
* A couple of trivial phpdoc tweaks
* Removed unused $DB global from postgres_lock_factory::get_index_from_key
* Added global namespace \ to exceptions in get_index_from_key (tested and found they didn't resolve)
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).
