Fredrik,
I have been using the Erlang/OTP tools (pman, et, etc.) to
investigate the Yxa application. I've been writing a trace
tool for et which diagrams the process/message flow.
In order to recognize some of the processes which are spawned
dynamically (e.g. during a transaction) outside of the OTP
supervision tree I made the attached patch to change from
erlang:spawn[_link]/1,3 to proc_lib:spawn[_link]/1,3. With
this change I can inspect the system process information and
determine a processes ancestry. Using proc_lib can help when
problems arise as well because SASL willl print crash reports.
If this change doesn't cause adverse effects to existing
systems it would probably be a good idea to committ it. The
only problem I would anticipate is increased verbosity.
-Vance
Index: src/transportlayer/tcp_receiver.erl
===================================================================
--- src/transportlayer/tcp_receiver.erl (revision 1655)
+++ src/transportlayer/tcp_receiver.erl (working copy)
@@ -174,7 +174,7 @@
Recv = #recv{origin_str = OriginStr,
stun_env = StunEnv
},
- spawn_link(?MODULE, recv_loop, [State, Recv]).
+ proc_lib:spawn_link(?MODULE, recv_loop, [State, Recv]).
%%====================================================================
%% Internal functions
Index: src/transportlayer/tcp_listener.erl
===================================================================
--- src/transportlayer/tcp_listener.erl (revision 1655)
+++ src/transportlayer/tcp_listener.erl (working copy)
@@ -81,7 +81,7 @@
true ->
case lists:keysearch(certfile, 1, Options) of
{value, _} ->
- Pid = spawn_link(?MODULE, start_listening, [Proto, Port,
InetModule, SocketModule, Options]),
+ Pid = proc_lib:spawn_link(?MODULE, start_listening, [Proto,
Port, InetModule, SocketModule, Options]),
{ok, Pid};
false ->
logger:log(normal, "NOT starting ~p listener on port ~p, no
SSL server certificate specified "
@@ -89,7 +89,7 @@
ignore
end;
false ->
- Pid = spawn_link(?MODULE, start_listening, [Proto, Port,
InetModule, SocketModule, Options]),
+ Pid = proc_lib:spawn_link(?MODULE, start_listening, [Proto, Port,
InetModule, SocketModule, Options]),
{ok, Pid}
end.
Index: src/sipserver.erl
===================================================================
--- src/sipserver.erl (revision 1655)
+++ src/sipserver.erl (working copy)
@@ -332,7 +332,7 @@
%% @end
%%--------------------------------------------------------------------
safe_spawn(Module, Function, Arguments) ->
- spawn(fun() -> safe_spawn_child(Module, Function, Arguments) end).
+ proc_lib:spawn(fun() -> safe_spawn_child(Module, Function, Arguments) end).
safe_spawn_child(Module, Function, Arguments) ->
try apply(Module, Function, Arguments) of
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