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-rw-r--r--erts/preloaded/src/erlang.erl34
1 files changed, 34 insertions, 0 deletions
diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl
index 4affc9bffe..4cbff3f36e 100644
--- a/erts/preloaded/src/erlang.erl
+++ b/erts/preloaded/src/erlang.erl
@@ -43,6 +43,9 @@
-export([memory/0, memory/1]).
-export([alloc_info/1, alloc_sizes/1]).
+-export([gather_sched_wall_time_result/1,
+ await_sched_wall_time_modifications/2]).
+
-deprecated([hash/2]).
% Get rid of autoimports of spawn to avoid clashes with ourselves.
@@ -1202,3 +1205,34 @@ receive_allocator(Ref, N, Acc) ->
{Ref, _, InfoList} ->
receive_allocator(Ref, N-1, insert_info(InfoList, Acc))
end.
+
+-spec await_sched_wall_time_modifications(Ref, Result) -> boolean() when
+ Ref :: reference(),
+ Result :: boolean().
+
+await_sched_wall_time_modifications(Ref, Result) ->
+ sched_wall_time(Ref, erlang:system_info(schedulers)),
+ Result.
+
+-spec gather_sched_wall_time_result(Ref) -> [{pos_integer(),
+ non_neg_integer(),
+ non_neg_integer()}] when
+ Ref :: reference().
+
+gather_sched_wall_time_result(Ref) when is_reference(Ref) ->
+ sched_wall_time(Ref, erlang:system_info(schedulers), []).
+
+sched_wall_time(_Ref, 0) ->
+ ok;
+sched_wall_time(Ref, N) ->
+ receive Ref -> sched_wall_time(Ref, N-1) end.
+
+sched_wall_time(_Ref, 0, Acc) ->
+ Acc;
+sched_wall_time(Ref, N, undefined) ->
+ receive {Ref, _} -> sched_wall_time(Ref, N-1, undefined) end;
+sched_wall_time(Ref, N, Acc) ->
+ receive
+ {Ref, undefined} -> sched_wall_time(Ref, N-1, undefined);
+ {Ref, SWT} -> sched_wall_time(Ref, N-1, [SWT|Acc])
+ end.