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<  Erlang bugs mailing list  ~  [erlang-questions] Erlang's process not killed by exit sign
uwiger
Posted: Thu Oct 29, 2009 9:57 am Reply with quote
User Joined: 03 Jul 2006 Posts: 604 Location: Sweden
Joe Armstrong wrote:
>
> The distinction between messages and signals is subtle.

One way to verify that it is indeed as Joe says:

Eshell V5.6.5 (abort with ^G)
1> P = spawn(fun() -> timer:sleep(infinity) end).
<0.32.0>
2> P ! {'EXIT',self(),foo}.
{'EXIT',<0.30.0>,foo}
3> is_process_alive(P).
true
4> exit(P,foo).
true
5> is_process_alive(P).
false
6>

In other words, you cannot fake an exit signal by sending
an {'EXIT',P,R} message.

BR,
Ulf W
--
Ulf Wiger
CTO, Erlang Training & Consulting Ltd
http://www.erlang-consulting.com

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uwiger
Posted: Thu Oct 29, 2009 2:04 pm Reply with quote
User Joined: 03 Jul 2006 Posts: 604 Location: Sweden
Robert Virding wrote:
>
> BUT when I do exit(kill) I send a type 2 signal with value 'kill' which
> doesn't behave as a type 3 'kill' signal though the name is the same. This
> is inconsistent, and I don't like inconsistencies. There are two different
> solutions: either send out real type 3 kill signals; or send out type 2
> 'killed' signals as if I had received a type 3 signal. Both are consistent,
> but which is best?

Why send out type 3 kill signals?

What is that consistent with?

I think the consistent behaviour would be to send out type 2
'killed' signals.

BR,
Ulf W
--
Ulf Wiger
CTO, Erlang Training & Consulting Ltd
http://www.erlang-consulting.com

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erlang-bugs (at) erlang.org

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