wp-admin/includes/class-wp-upgrader.php:1056Creates a lock using WordPress options.
$lock_namestring$release_timeoutintoptionalnullbool public static function create_lock( $lock_name, $release_timeout = null ) { global $wpdb; if ( ! $release_timeout ) { $release_timeout = HOUR_IN_SECONDS; } $lock_option = $lock_name . '.lock'; // Try to lock. $lock_result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` ( `option_name`, `option_value`, `autoload` ) VALUES (%s, %s, 'off') /* LOCK */", $lock_option, time() ) ); if ( ! $lock_result ) { $lock_result = get_option( $lock_option ); // If a lock couldn't be created, and there isn't a lock, bail. if ( ! $lock_result ) { return false; } // Check to see if the lock is still valid. If it is, bail. if ( $lock_result > ( time() - $release_timeout ) ) { return false; } // There must exist an expired lock, clear it and re-gain it. WP_Upgrader::release_lock( $lock_name ); return WP_Upgrader::create_lock( $lock_name, $release_timeout ); } // Update the lock, as by this point we've definitely got a lock, just need to fire the actions. update_option( $lock_option, time(), false ); return true; }Introduced in 4.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-upgrader.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.