1 system.api.php hook_cron_queue_info()

Declare queues holding items that need to be run periodically.

While there can be only one hook_cron() process running at the same time, there can be any number of processes defined here running. Because of this, long running tasks are much better suited for this API. Items queued in hook_cron() might be processed in the same cron run if there are not many items in the queue, otherwise it might take several requests, which can be run in parallel.

Return value

An associative array where the key is the queue name and the value is: again an associative array. Possible keys are:

  • 'worker callback': A PHP callable to call that is an implementation of callback_queue_worker().
  • 'time': (optional) How much time Backdrop should spend on calling this worker in seconds. Defaults to 15.
  • 'skip on cron': (optional) Set to TRUE to avoid being processed during cron runs. i.e. you want to control all queue execution manually.

See also



Related topics


core/modules/system/system.api.php, line 154
Hooks provided by Backdrop core and the System module.


function hook_cron_queue_info() {
  $queues['aggregator_feeds'] = array(
    'worker callback' => 'aggregator_refresh',
    'time' => 60,
  return $queues;