File 3254-Simplify-diameter_util.patch of Package erlang

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File 3254-Simplify-diameter_util.patch of Package erlang (Revision 3c9c0418baf827024777fc45d8229550)

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From 75ae8344f215acf2f4133aa2518aa0094bf760c6 Mon Sep 17 00:00:00 2001
From: Anders Svensson <anders@erlang.org>
Date: Sun, 20 Feb 2022 21:27:07 +0100
Subject: [PATCH 4/7] Simplify diameter_util

map_size/1 has existed since OTP 17.0 and is_map_key/2 since OTP 21.0:
use them to simplify some mechanics. Simplify more as well, and add
choose/1, tmpdir/0, and mktemp/1; the latter two for running suites that
need a temporary directory without common_test. Ensure run/1 doesn't
orphan any temporary processes when it returns.

runtime_dependencies in the appfile states erts-10.0, which corresponds
to OTP 21.0, so there is no new dependency.
---
 lib/diameter/test/diameter_util.erl | 153 +++++++++++++++++-----------
 1 file changed, 95 insertions(+), 58 deletions(-)

diff --git a/lib/diameter/test/diameter_util.erl b/lib/diameter/test/diameter_util.erl
index d249b0e4fa..5ccfeb7a7e 100644
--- a/lib/diameter/test/diameter_util.erl
+++ b/lib/diameter/test/diameter_util.erl
@@ -31,6 +31,9 @@
          fold/3,
          foldl/3,
          scramble/1,
+         choose/1,
+         tmpdir/0,
+         mktemp/1,
          unique_string/0,
          have_sctp/0,
          eprof/1]).
@@ -102,18 +105,37 @@ consult(Path) ->
 %% ---------------------------------------------------------------------------
 %% run/1
 %%
-%% Evaluate functions in parallel and return a list of those that
-%% failed to return. The fun takes a boolean (did the function return
-%% or not), the function that was evaluated, the return value or exit
-%% reason and the prevailing accumulator.
+%% Evaluate functions in parallel and raise an error exception if any
+%% fail to return.
 
 run(L) ->
-    fold(fun cons/4, [], L).
-
-cons(true, _, _, Acc) ->
-    Acc;
-cons(false, F, RC, Acc) ->
-    [{F, RC} | Acc].
+    Ref = make_ref(),
+    AccF = fun(I, [F|T]) ->
+                   Ref == (catch element(1, I))
+                       orelse error(#{failed => F, reason => I}),
+                   T
+           end,
+    Pid = self(),
+    Funs = [fun() -> down(Pid, self()), {Ref, eval(F)} end || F <- L],
+    [] = fold(AccF, L, Funs).
+
+%% down/2
+
+down(Parent, Worker)
+  when is_pid(Parent) ->
+    spawn(fun() ->
+                  monitor(process, Worker),
+                  down(monitor(process, Parent), Worker)
+          end);
+
+%% Die with the worker, kill the worker if the parent dies.
+down(MRef, Pid) ->
+    receive
+        {'DOWN', MRef, process, _, _} ->
+            exit(Pid, kill);
+        {'DOWN', _, process, Pid, _} ->
+            ok
+    end.
 
 %% ---------------------------------------------------------------------------
 %% fold/3
@@ -121,61 +143,43 @@ cons(false, F, RC, Acc) ->
 %% Parallel fold. Results are folded in the order received.
 
 fold(Fun, Acc0, L)
-  when is_function(Fun, 4) ->
-    Ref = make_ref(),
-    %% Spawn a middleman to collect down messages from processes
-    %% spawned for each function so as not to assume that all DOWN
-    %% messages are ours.
-    MRef = run1([fun fold/4, Ref, Fun, Acc0, L], Ref),
-    {Ref, RC} = down(MRef),
-    RC.
-
-fold(Ref, Fun, Acc0, L) ->
-    recv(run(Ref, L), Ref, Fun, Acc0).
-
-run(Ref, L) ->
-    [{run1(F, Ref), F} || F <- L].
-
-run1(F, Ref) ->
-    {_, MRef} = spawn_monitor(fun() -> exit({Ref, eval(F)}) end),
-    MRef.
-
-recv([], _, _, Acc) ->
+  when is_list(L) ->
+    fold(Fun, Acc0, lists:foldl(fun(F,A) ->
+                                        {P,M} = spawn_eval(F),
+                                        A#{M => P}
+                                end,
+                                #{},
+                                L));
+
+fold(_, Acc, Map)
+  when 0 == map_size(Map) ->
     Acc;
-recv(L, Ref, Fun, Acc) ->
-    {MRef, R} = down(),
-    {MRef, F} = lists:keyfind(MRef, 1, L),
-    recv(lists:keydelete(MRef, 1, L),
-         Ref,
-         Fun,
-         acc(R, Ref, F, Fun, Acc)).
 
-acc({Ref, RC}, Ref, F, Fun, Acc) ->
-    Fun(true, F, RC, Acc);
-acc(Reason, _, F, Fun, Acc) ->
-    Fun(false, F, Reason, Acc).
+fold(Fun, Acc, #{} = Map) ->
+    receive
+        {'DOWN', MRef, process, _, Info} when is_map_key(MRef, Map) ->
+            fold(Fun, Fun(Info, Acc), maps:remove(MRef, Map))
+    end.
 
-down(MRef) ->
-    receive {'DOWN', MRef, process, _, Reason} -> Reason end.
+%% spawn_eval/1
 
-down() ->
-    receive {'DOWN', MRef, process, _, Reason} -> {MRef, Reason} end.
+spawn_eval(F) ->
+    spawn_monitor(fun() -> exit(eval(F)) end).
 
 %% ---------------------------------------------------------------------------
 %% foldl/3
 %%
 %% Parallel fold. Results are folded in order of the function list.
 
-foldl(Fun, Acc0, L)
-  when is_function(Fun, 4) ->
-    Ref = make_ref(),
-    recvl(run(Ref, L), Ref, Fun, Acc0).
+foldl(Fun, Acc0, L) ->
+    lists:foldl(fun(R,A) -> acc(Fun, R, A) end,
+                Acc0,
+                [M || F <- L, {_,M} <- [spawn_eval(F)]]).
 
-recvl([], _, _, Acc) ->
-    Acc;
-recvl([{MRef, F} | L], Ref, Fun, Acc) ->
-    R = down(MRef),
-    recvl(L, Ref, Fun, acc(R, Ref, F, Fun, Acc)).
+%% acc/3
+
+acc(Fun, MRef, Acc) ->
+    receive {'DOWN', MRef, process, _, Info} -> Fun(Info, Acc) end.
 
 %% ---------------------------------------------------------------------------
 %% scramble/1
@@ -185,6 +189,33 @@ recvl([{MRef, F} | L], Ref, Fun, Acc) ->
 scramble(L) ->
     [X || {_,X} <- lists:sort([{rand:uniform(), T} || T <- L])].
 
+%% ---------------------------------------------------------------------------
+%% choose/1
+%%
+%% Return a random element from a list.
+
+choose([_|_] = List) ->
+    hd(lists:nthtail(rand:uniform(length(List)) - 1, List)).
+
+%% ---------------------------------------------------------------------------
+%% tmpdir/0
+
+tmpdir() ->
+    case os:getenv("TMPDIR") of
+        false ->
+            "/tmp";
+        Dir ->
+            Dir
+    end.
+
+%% mktemp/1
+
+mktemp(Prefix) ->
+    Suf = integer_to_list(erlang:monotonic_time()),
+    Tmp = Prefix ++ "." ++ Suf,
+    ok = file:make_dir(Tmp),
+    Tmp.
+
 %% ---------------------------------------------------------------------------
 %% unique_string/0
 
@@ -208,8 +239,7 @@ have_sctp(_) ->
         {ok, Sock} ->
             gen_sctp:close(Sock),
             true;
-        {error, E} when E == eprotonosupport;
-                        E == esocktnosupport -> %% fail on any other reason
+        _ ->
             false
     end.
 
@@ -218,6 +248,13 @@ have_sctp(_) ->
 %%
 %% Evaluate a function in one of a number of forms.
 
+eval({F, infinity}) ->
+    eval(F);
+eval({F, Tmo})
+  when is_integer(Tmo) ->
+    {ok, _} = timer:exit_after(Tmo, timeout),
+    eval(F);
+
 eval({M,[F|A]})
   when is_atom(F) ->
     apply(M,F,A);
@@ -231,7 +268,7 @@ eval([F|A])
 
 eval(L)
   when is_list(L) ->
-    run(L);
+    [eval(F) || F <- L];
 
 eval(F)
   when is_function(F,0) ->
-- 
2.34.1

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File 3254-Simplify-diameter_util.patch of Package erlang (Revision 3c9c0418baf827024777fc45d8229550)

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