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-rw-r--r--lib/stdlib/src/gen_event.erl85
1 files changed, 44 insertions, 41 deletions
diff --git a/lib/stdlib/src/gen_event.erl b/lib/stdlib/src/gen_event.erl
index 7629e88fbf..469acdc37c 100644
--- a/lib/stdlib/src/gen_event.erl
+++ b/lib/stdlib/src/gen_event.erl
@@ -1,7 +1,7 @@
%%
%% %CopyrightBegin%
%%
-%% Copyright Ericsson AB 1996-2013. All Rights Reserved.
+%% Copyright Ericsson AB 1996-2014. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
@@ -40,6 +40,8 @@
system_continue/3,
system_terminate/4,
system_code_change/4,
+ system_get_state/1,
+ system_replace_state/2,
format_status/2]).
-export_type([handler/0, handler_args/0, add_handler_ret/0,
@@ -47,8 +49,6 @@
-import(error_logger, [error_msg/2]).
--define(reply(X), From ! {element(2,Tag), X}).
-
-record(handler, {module :: atom(),
id = false,
state,
@@ -229,24 +229,6 @@ wake_hib(Parent, ServerName, MSL, Debug) ->
fetch_msg(Parent, ServerName, MSL, Debug, Hib) ->
receive
- {system, From, get_state} ->
- States = [{Mod,Id,State} || #handler{module=Mod, id=Id, state=State} <- MSL],
- sys:handle_system_msg(get_state, From, Parent, ?MODULE, Debug,
- {States, [ServerName, MSL, Hib]}, Hib);
- {system, From, {replace_state, StateFun}} ->
- {NMSL, NStates} =
- lists:unzip([begin
- Cur = {Mod,Id,State},
- try
- NState = {Mod,Id,NS} = StateFun(Cur),
- {HS#handler{state=NS}, NState}
- catch
- _:_ ->
- {HS, Cur}
- end
- end || #handler{module=Mod, id=Id, state=State}=HS <- MSL]),
- sys:handle_system_msg(replace_state, From, Parent, ?MODULE, Debug,
- {NStates, [ServerName, NMSL, Hib]}, Hib);
{system, From, Req} ->
sys:handle_system_msg(Req, From, Parent, ?MODULE, Debug,
[ServerName, MSL, Hib],Hib);
@@ -265,49 +247,49 @@ handle_msg(Msg, Parent, ServerName, MSL, Debug) ->
{notify, Event} ->
{Hib,MSL1} = server_notify(Event, handle_event, MSL, ServerName),
loop(Parent, ServerName, MSL1, Debug, Hib);
- {From, Tag, {sync_notify, Event}} ->
+ {_From, Tag, {sync_notify, Event}} ->
{Hib, MSL1} = server_notify(Event, handle_event, MSL, ServerName),
- ?reply(ok),
+ reply(Tag, ok),
loop(Parent, ServerName, MSL1, Debug, Hib);
{'EXIT', From, Reason} ->
MSL1 = handle_exit(From, Reason, MSL, ServerName),
loop(Parent, ServerName, MSL1, Debug, false);
- {From, Tag, {call, Handler, Query}} ->
+ {_From, Tag, {call, Handler, Query}} ->
{Hib, Reply, MSL1} = server_call(Handler, Query, MSL, ServerName),
- ?reply(Reply),
+ reply(Tag, Reply),
loop(Parent, ServerName, MSL1, Debug, Hib);
- {From, Tag, {add_handler, Handler, Args}} ->
+ {_From, Tag, {add_handler, Handler, Args}} ->
{Hib, Reply, MSL1} = server_add_handler(Handler, Args, MSL),
- ?reply(Reply),
+ reply(Tag, Reply),
loop(Parent, ServerName, MSL1, Debug, Hib);
- {From, Tag, {add_sup_handler, Handler, Args, SupP}} ->
+ {_From, Tag, {add_sup_handler, Handler, Args, SupP}} ->
{Hib, Reply, MSL1} = server_add_sup_handler(Handler, Args, MSL, SupP),
- ?reply(Reply),
+ reply(Tag, Reply),
loop(Parent, ServerName, MSL1, Debug, Hib);
- {From, Tag, {delete_handler, Handler, Args}} ->
+ {_From, Tag, {delete_handler, Handler, Args}} ->
{Reply, MSL1} = server_delete_handler(Handler, Args, MSL,
ServerName),
- ?reply(Reply),
+ reply(Tag, Reply),
loop(Parent, ServerName, MSL1, Debug, false);
- {From, Tag, {swap_handler, Handler1, Args1, Handler2, Args2}} ->
+ {_From, Tag, {swap_handler, Handler1, Args1, Handler2, Args2}} ->
{Hib, Reply, MSL1} = server_swap_handler(Handler1, Args1, Handler2,
Args2, MSL, ServerName),
- ?reply(Reply),
+ reply(Tag, Reply),
loop(Parent, ServerName, MSL1, Debug, Hib);
- {From, Tag, {swap_sup_handler, Handler1, Args1, Handler2, Args2,
+ {_From, Tag, {swap_sup_handler, Handler1, Args1, Handler2, Args2,
Sup}} ->
{Hib, Reply, MSL1} = server_swap_handler(Handler1, Args1, Handler2,
Args2, MSL, Sup, ServerName),
- ?reply(Reply),
+ reply(Tag, Reply),
loop(Parent, ServerName, MSL1, Debug, Hib);
- {From, Tag, stop} ->
+ {_From, Tag, stop} ->
catch terminate_server(normal, Parent, MSL, ServerName),
- ?reply(ok);
- {From, Tag, which_handlers} ->
- ?reply(the_handlers(MSL)),
+ reply(Tag, ok);
+ {_From, Tag, which_handlers} ->
+ reply(Tag, the_handlers(MSL)),
loop(Parent, ServerName, MSL, Debug, false);
- {From, Tag, get_modules} ->
- ?reply(get_modules(MSL)),
+ {_From, Tag, get_modules} ->
+ reply(Tag, get_modules(MSL)),
loop(Parent, ServerName, MSL, Debug, false);
Other ->
{Hib, MSL1} = server_notify(Other, handle_info, MSL, ServerName),
@@ -319,6 +301,10 @@ terminate_server(Reason, Parent, MSL, ServerName) ->
do_unlink(Parent, MSL),
exit(Reason).
+reply({From, Ref}, Msg) ->
+ From ! {Ref, Msg},
+ ok.
+
%% unlink the supervisor process of all supervised handlers.
%% We do not want a handler supervisor to EXIT due to the
%% termination of the event manager (server).
@@ -383,6 +369,23 @@ system_code_change([ServerName, MSL, Hib], Module, OldVsn, Extra) ->
MSL),
{ok, [ServerName, MSL1, Hib]}.
+system_get_state([_ServerName, MSL, _Hib]) ->
+ {ok, [{Mod,Id,State} || #handler{module=Mod, id=Id, state=State} <- MSL]}.
+
+system_replace_state(StateFun, [ServerName, MSL, Hib]) ->
+ {NMSL, NStates} =
+ lists:unzip([begin
+ Cur = {Mod,Id,State},
+ try
+ NState = {Mod,Id,NS} = StateFun(Cur),
+ {HS#handler{state=NS}, NState}
+ catch
+ _:_ ->
+ {HS, Cur}
+ end
+ end || #handler{module=Mod, id=Id, state=State}=HS <- MSL]),
+ {ok, NStates, [ServerName, NMSL, Hib]}.
+
%%-----------------------------------------------------------------
%% Format debug messages. Print them as the call-back module sees
%% them, not as the real erlang messages. Use trace for that.
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-02 20:32:36 +0000