function node_import_lock_acquire in Node import 6

Acquire or release our node_import lock.

Parameters

$release: Boolean. If TRUE, release the lock. If FALSE, acquire the lock.

Return value

Boolean. Whether the lock was acquired.

Related topics

2 calls to node_import_lock_acquire()

node_import_do_task in ./node_import.inc

Import a number of rows from the specified task. Should only be called from within hook_cron() or from a JS callback as this function may take a long time.

node_import_lock_release in ./node_import.inc

Release our node_import lock.

File

./node_import.inc, line 2187

Public API of the Node import module.

Code

function node_import_lock_acquire($release = FALSE) {
  static $lock_id, $locked;
  if (!isset($lock_id)) {
    $lock_id = md5(uniqid());
    $locked = FALSE;
    register_shutdown_function('node_import_lock_release');
  }
  if ($release) {
    db_query("DELETE FROM {variable} WHERE name = '%s'", 'node_import:lock');
    $locked = FALSE;
  }
  else {
    if (!$locked) {
      if (@db_query("INSERT INTO {variable} (name, value) VALUES ('%s', '%s')", 'node_import:lock', $lock_id)) {
        $locked = TRUE;
      }
    }
  }
  return $locked;
}