diff options
Diffstat (limited to 'erts/preloaded/src/erlang.erl')
| -rw-r--r-- | erts/preloaded/src/erlang.erl | 34 |
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. |