1 lock.inc _lock_id()

Helper function to get this request's unique id.

Related topics

Locking mechanisms Functions to coordinate long-running operations across requests.

File

core/includes/lock.inc, line 75
A database-mediated implementation of a locking mechanism.

Code

function _lock_id() {
  // Do not use backdrop_static(). This identifier refers to the current
  // client request, and must not be changed under any circumstances
  // else the shutdown handler may fail to release our locks.
  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.
    backdrop_register_shutdown_function('lock_release_all', $lock_id);
  }
  return $lock_id;
}