Shutdown function: Performs cron cleanup.
drupal_register_shutdown_function()
function drupal_cron_cleanup() {
// See if the semaphore is still locked.
if (variable_get('cron_semaphore', FALSE)) {
watchdog('cron', 'Cron run exceeded the time limit and was aborted.', array(), WATCHDOG_WARNING);
// Release cron semaphore.
variable_del('cron_semaphore');
}
}