| Author |
Message |
< Erlang questions mailing list ~ what is trap_exit business, process_flag(trap_exit, true) |
| Guest |
 Posted: Thu Apr 24, 2008 1:29 am |
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Guest
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In my gen_server:init function, I spawn client processes onto remote
nodes using proc_lib:spawn_link(N, M, F, A). Before I spawn any
process on to remote nodes, I have placed process_flag(trap_exit,
true). But when I do exit kill/shutdown in the shell, my gen_server
and all the remote client processes are terminated mercilessly. I
thought process_flag(trap_exit, true) supposed to prevent the whole
thing from crashing. Are these kill/shutdown type of exits trappable
or only 'EXIT'?
(b@mybox)8> exit(pid(0,147,0)).
** exception exit: <0.147.0>
in function exit/1
called as exit(<0.147.0>)
(b@mybox)9> exit(pid(0,147,0), kill).
true
(b@mybox)10> exit(pid(0,182,0), shutdown).
true
(a@mybox)9>
=ERROR REPORT==== 23-Apr-2008::19:54:52 ===
** Generic server clnt_sup terminating
** Last message in was {'EXIT',<5679.182.0>,shutdown}
** When Server state == {ets_pid,{clnt,loop,[<0.6396.0>]}}
** Reason for termination ==
** {'module could not be loaded',[{ets_pid,tab2list,[]},
{clnt_sup,terminate,2},
{gen_server,terminate,6},
{proc_lib,init_p,5}]}
Thank you,
hoping to get some answers from erlang mailing list, people in IRC are
very helpful.
--
rk
That which we persist in doing becomes easier for us to do; not that
the nature of the thing itself is changed, but that our power to do is
increased.
-Ralph Waldo Emerson
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| Guest |
| Posted: Thu Apr 24, 2008 12:12 pm |
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Guest
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On Wed, Apr 23, 2008 at 09:21:41PM -0400, db wrote:
> In my gen_server:init function, I spawn client processes onto remote
> nodes using proc_lib:spawn_link(N, M, F, A). Before I spawn any
> process on to remote nodes, I have placed process_flag(trap_exit,
> true). But when I do exit kill/shutdown in the shell, my gen_server
> and all the remote client processes are terminated mercilessly. I
> thought process_flag(trap_exit, true) supposed to prevent the whole
> thing from crashing. Are these kill/shutdown type of exits trappable
> or only 'EXIT'?
>
It is the spawned processes that need to execute
process_flag(trap_exit, true). That property is
not inherited at spawn.
See http://www.erlang.org/doc/reference_manual/part_frame.html,
section 10, esp. 10.4-7.
> (b@mybox)8> exit(pid(0,147,0)).
> ** exception exit: <0.147.0>
> in function exit/1
> called as exit(<0.147.0>)
>
> (b@mybox)9> exit(pid(0,147,0), kill).
> true
>
> (b@mybox)10> exit(pid(0,182,0), shutdown).
> true
>
> (a@mybox)9>
> =ERROR REPORT==== 23-Apr-2008::19:54:52 ===
> ** Generic server clnt_sup terminating
> ** Last message in was {'EXIT',<5679.182.0>,shutdown}
> ** When Server state == {ets_pid,{clnt,loop,[<0.6396.0>]}}
> ** Reason for termination ==
> ** {'module could not be loaded',[{ets_pid,tab2list,[]},
> {clnt_sup,terminate,2},
> {gen_server,terminate,6},
> {proc_lib,init_p,5}]}
> Thank you,
> hoping to get some answers from erlang mailing list, people in IRC are
> very helpful.
> --
> rk
>
> That which we persist in doing becomes easier for us to do; not that
> the nature of the thing itself is changed, but that our power to do is
> increased.
> -Ralph Waldo Emerson
> _______________________________________________
> erlang-questions mailing list
> erlang-questions@erlang.org
> http://www.erlang.org/mailman/listinfo/erlang-questions
--
/ Raimo Niskanen, Erlang/OTP, Ericsson AB
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| wuji |
| Posted: Fri Aug 17, 2012 8:39 am |
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User
Joined: 10 Aug 2012
Posts: 654
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