Function merge_loop

src/sort.c:3800–3821

   null if TFP is standard output.  */

static void
merge_loop (struct merge_node_queue *queue,
            size_t total_lines, FILE *tfp, char const *temp_output)
{
  while (true)
    {
      struct merge_node *node = queue_pop (queue);

      if (node->level == MERGE_END)
        {
          unlock_node (node);
          /* Reinsert so other threads can pop it. */
          queue_insert (queue, node);
          break;
        }
      mergelines_node (node, total_lines, tfp, temp_output);
      queue_check_insert (queue, node);
      queue_check_insert_parent (queue, node);

      unlock_node (node);
    }
}


static void sortlines (struct line *restrict, size_t, size_t,