#331611: integrate a "poormanscron" like feature in core.

From: Damien Tournoud <damien@tournoud.net>


---

 includes/common.inc             |    9 +++++++++
 modules/system/system.admin.inc |    7 +++++++
 2 files changed, 16 insertions(+), 0 deletions(-)


diff --git includes/common.inc includes/common.inc
index 73b7526..908b78b 100644
--- includes/common.inc
+++ includes/common.inc
@@ -2715,6 +2715,7 @@ function _drupal_bootstrap_full() {
   require_once DRUPAL_ROOT . '/includes/form.inc';
   require_once DRUPAL_ROOT . '/includes/mail.inc';
   require_once DRUPAL_ROOT . '/includes/actions.inc';
+
   // Set the Drupal custom error handler.
   set_error_handler('_drupal_error_handler');
   set_exception_handler('_drupal_exception_handler');
@@ -2728,6 +2729,14 @@ function _drupal_bootstrap_full() {
   // Load all enabled modules
   module_load_all();
 
+  // Register a safe cron run at the end of the request if needed.
+  if (variable_get('cron_safe_run', 1)) {
+    $cron_last = variable_get('cron_last', NULL);
+    if (!isset($cron_last) || (REQUEST_TIME - $cron_last > variable_get('cron_safe_threshold', 10800))) {
+      register_shutdown_function('drupal_cron_run');
+    }
+  }
+
   // Let all modules take action before menu system handles the request
   // We do not want this while running update.php.
   if (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update') {
diff --git modules/system/system.admin.inc modules/system/system.admin.inc
index b18adc7..6f545d5 100644
--- modules/system/system.admin.inc
+++ modules/system/system.admin.inc
@@ -1716,6 +1716,13 @@ function system_site_maintenance_settings() {
     '#description' => t('Message to show visitors when the site is in offline mode.')
   );
 
+  $form['cron_safe_run'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Automatically run the cron'),
+    '#default_value' => variable_get('cron_safe_run', 1),
+    '#description' => t('Automatically run the cron if it has not run for an extended period of time.'),
+  );
+
   return system_settings_form($form);
 }