Function cancel_notification

system/lib/pthread/em_task_queue.c:228–231

}

static void cancel_notification(void* arg) {
  em_task_queue* tasks = arg;
  em_task_queue_cancel(tasks);
}

bool em_task_queue_send(em_task_queue* queue, task t) {
  // Ensure the target mailbox will remain open or detect that it is already