_lock_id

Helper function to get this request's unique id.

Related topics

Functions to coordinate long-running operations across requests.

In most environments, multiple Drupal page requests (a.k.a. threads or processes) will execute in parallel. This leads to potential conflicts or race conditions when two requests execute the same code at the same time. A common example of this is a…

3 calls to _lock_id()

File

includes/lock.inc, line 74

A database-mediated implementation of a locking mechanism.

Code

function _lock_id() {
  static $lock_id;

  if (!isset($lock_id)) {
    // Assign a unique id.
    $lock_id = uniqid(mt_rand(), TRUE);
    // We only register a shutdown function if a lock is used.
    register_shutdown_function('lock_release_all', $lock_id);
  }
  return $lock_id;
}