Function retraversegrays

third-party/lua-5.2.4/src/lgc.c:582–591

** retraverse all gray lists. Because tables may be reinserted in other ** lists when traversed, traverse the original lists to avoid traversing ** twice the same table (which is not wrong, but inefficient) */

** twice the same table (which is not wrong, but inefficient)
*/
static void retraversegrays (global_State *g) {
  GCObject *weak = g->weak;  /* save original lists */
  GCObject *grayagain = g->grayagain;
  GCObject *ephemeron = g->ephemeron;
  g->weak = g->grayagain = g->ephemeron = NULL;
  propagateall(g);  /* traverse main gray list */
  propagatelist(g, grayagain);
  propagatelist(g, weak);
  propagatelist(g, ephemeron);
}


static void convergeephemerons (global_State *g) {