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-rw-r--r--erts/preloaded/src/erts_internal.erl30
1 files changed, 30 insertions, 0 deletions
diff --git a/erts/preloaded/src/erts_internal.erl b/erts/preloaded/src/erts_internal.erl
index 2c5bd82cf0..30df75b406 100644
--- a/erts/preloaded/src/erts_internal.erl
+++ b/erts/preloaded/src/erts_internal.erl
@@ -38,6 +38,10 @@
-export([check_process_code/2]).
+-export([flush_monitor_messages/3]).
+
+-export([time_unit/0]).
+
%%
%% Await result of send to port
%%
@@ -178,3 +182,29 @@ cmp_term(_A,_B) ->
map_to_tuple_keys(_M) ->
erlang:nif_error(undefined).
+
+-spec erts_internal:flush_monitor_messages(Ref, Multi, Res) -> term() when
+ Ref :: reference(),
+ Multi :: boolean(),
+ Res :: term().
+
+%% erlang:demonitor(Ref, [flush]) traps to
+%% erts_internal:flush_monitor_messages(Ref, Res) when
+%% it needs to flush monitor messages.
+flush_monitor_messages(Ref, Multi, Res) when is_reference(Ref) ->
+ receive
+ {_, Ref, _, _, _} ->
+ case Multi of
+ false ->
+ Res;
+ _ ->
+ flush_monitor_messages(Ref, Multi, Res)
+ end
+ after 0 ->
+ Res
+ end.
+
+-spec erts_internal:time_unit() -> pos_integer().
+
+time_unit() ->
+ erlang:nif_error(undefined).