Search moodle.org's
Developer Documentation
Developer Documentation
See Release Notes
Long Term Support Release
- Bug fixes for general core bugs in 4.1.x will end 13 November 2023 (12 months).
- Bug fixes for security issues in 4.1.x will end 10 November 2025 (36 months).
- PHP version: minimum PHP 7.4.0 Note: minimum PHP version has increased since Moodle 4.0. PHP 8.0.x is supported too.
/cache/locks/file/ -> lib.php (source)
File locking for the Cache API
| Copyright: | 2012 Sam Hemelryk |
| License: | http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later |
| File Size: | 237 lines (9 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 0 files |
Defines 1 class
cachelock_file:: (6 methods):
__construct()
lock()
unlock()
check_state()
get_lock_file()
__destruct()
Class: cachelock_file - X-Ref
File locking plugin| __construct($name, array $configuration = array() X-Ref |
| Initialises the cache lock instance. param: string $name The name of the cache lock param: array $configuration |
| lock($key, $ownerid, $block = false) X-Ref |
| Acquire a lock. If the lock can be acquired: This function will return true. If the lock cannot be acquired the result of this method is determined by the block param: $block = true (default) The function will block any further execution unti the lock can be acquired. This involves the function attempting to acquire the lock and the sleeping for a period of time. This process will be repeated until the lock is required or until a limit is hit (100 by default) in which case a cache exception will be thrown. $block = false The function will return false immediately. If a max life has been specified and the lock can not be acquired then the lock file will be checked against this time. In the case that the file exceeds that max time it will be forcefully deleted. Because this can obviously be a dangerous thing it is not used by default. If it is used it should be set high enough that we can be as sure as possible that the executing code has completed. param: string $key The key that we want to lock param: string $ownerid A unique identifier for the owner of this lock. Not used by default. param: bool $block True if we want the program block further execution until the lock has been acquired. return: bool |
| unlock($key, $ownerid, $forceunlock = false) X-Ref |
| Releases an acquired lock. For more details see {@link cache_lock::unlock()} param: string $key param: string $ownerid A unique identifier for the owner of this lock. Not used by default. param: bool $forceunlock If set to true the lock will be removed if it exists regardless of whether or not we own it. return: bool |
| check_state($key, $ownerid) X-Ref |
| Checks if the given key is locked. param: string $key param: string $ownerid |
| get_lock_file($key) X-Ref |
| Gets the name to use for a lock file. param: string $key return: string |
| __destruct() X-Ref |
| Cleans up the instance what it is no longer needed. |
