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xmpp.chapril.org-ejabberd
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Fall back to map/2 and foreach/2 on single-core machines

This commit is contained in:
Evgeny Khramtsov 2019-07-10 10:28:37 +03:00
parent 01f531b3d6
commit 04ccba0347
1 changed files with 36 additions and 28 deletions
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64
src/misc.erl
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@ -446,41 +446,49 @@ best_match(Pattern, Opts) ->
-spec pmap(fun((T1) -> T2), [T1]) -> [T2].
pmap(Fun, [_,_|_] = List) ->
Self = self(),
lists:map(
fun({Pid, Ref}) ->
receive
{Pid, Ret} ->
case erlang:system_info(logical_processors) of
1 -> lists:map(Fun, List);
_ ->
Self = self(),
lists:map(
fun({Pid, Ref}) ->
receive
{'DOWN', Ref, _, _, _} ->
Ret
end;
{'DOWN', Ref, _, _, Reason} ->
exit(Reason)
end
end, [spawn_monitor(
fun() -> Self ! {self(), Fun(X)} end)
|| X <- List]);
{Pid, Ret} ->
receive
{'DOWN', Ref, _, _, _} ->
Ret
end;
{'DOWN', Ref, _, _, Reason} ->
exit(Reason)
end
end, [spawn_monitor(
fun() -> Self ! {self(), Fun(X)} end)
|| X <- List])
end;
pmap(Fun, List) ->
lists:map(Fun, List).
-spec peach(fun((T) -> any()), [T]) -> ok.
peach(Fun, [_,_|_] = List) ->
Self = self(),
lists:foreach(
fun({Pid, Ref}) ->
receive
Pid ->
case erlang:system_info(logical_processors) of
1 -> lists:foreach(Fun, List);
_ ->
Self = self(),
lists:foreach(
fun({Pid, Ref}) ->
receive
{'DOWN', Ref, _, _, _} ->
ok
end;
{'DOWN', Ref, _, _, Reason} ->
exit(Reason)
end
end, [spawn_monitor(
fun() -> Fun(X), Self ! self() end)
|| X <- List]);
Pid ->
receive
{'DOWN', Ref, _, _, _} ->
ok
end;
{'DOWN', Ref, _, _, Reason} ->
exit(Reason)
end
end, [spawn_monitor(
fun() -> Fun(X), Self ! self() end)
|| X <- List])
end;
peach(Fun, List) ->
lists:foreach(Fun, List).