erts: Make atomic ets:delete_all_objects yield

by using a cooperative strategy that will make
any process accessing the table execute delelete_all_objects_continue
until the table is empty.

This is not an optimal solution as concurrent threads will still
block on the table lock, but at least thread progress is made.

1 files changed, 8 insertions, 1 deletions

diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index 89e3d3f43e..3c13991fb6 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -4731,7 +4731,14 @@ BIF_RETTYPE erts_debug_set_internal_state_2(BIF_ALIST_2)
                                             refbin));
             }
         }
-
+        else if (ERTS_IS_ATOM_STR("ets_force_trap", BIF_ARG_1)) {
+#ifdef ETS_DBG_FORCE_TRAP
+            erts_ets_dbg_force_trap = (BIF_ARG_2 == am_true) ? 1 : 0;
+            BIF_RET(am_ok);
+#else
+            BIF_RET(am_notsup);
+#endif
+        }
     }
 
     BIF_ERROR(BIF_P, BADARG);