application:stop hangs

Chandrashekhar Mullaparthi <>
Thu May 24 16:32:04 CEST 2001


After a bit more digging - there was no link between my worker process and
the supervisor!! I was using proc_lib:spawn. I used proc_lib:spawn_link and
everything works fine.

I had assumed that the supervisor will link to all it's children - it seems
to be the other way round. Why does the supervisor not link explicitly - it
would be quite handy!

cheers,
Chandru

> -----Original Message-----
> From: Chandrashekhar Mullaparthi
> [mailto:]
> Sent: 24 May 2001 13:42
> To: 'Erlang mailing list'
> Subject: RE: application:stop hangs
> 
> 
> Right - I did a bit of digging and found that supervisor is 
> hanging in the 
> shutdown(Pid, brutal_kill) function.
> 
> The reason seems to be that the supervisor did exit(Pid, 
> kill) - but the
> message {'EXIT', Pid, killed) was only sent to another 
> process to which my
> worker is linked to! And the supervisor is waiting in this bit of code
> 
> shutdown(Pid, brutal_kill) ->
>     exit(Pid, kill),
>     receive
> 	{'EXIT', Pid, killed} -> ok;
> 	{'EXIT', Pid, OtherReason} -> {error, OtherReason}
>     end;
> 
> Why is it that if a process has links to many processes, only 
> one of them
> gets the message that this process has been killed??
> 
> cheers,
> Chandru
> 
> > -----Original Message-----
> > From: Chandrashekhar Mullaparthi
> > [mailto:]
> > Sent: 24 May 2001 12:21
> > To: 'Erlang mailing list'
> > Subject: application:stop hangs
> > 
> > 
> > Hi,
> >  
> > I need help finding out why my application:stop hangs. 
> > I have a supervisor(one_for_one) which has:
> >  
> > 5 vanilla gen_servers, 
> >     {permanent, 2000, worker}
> >  
> > 10 workers spawned using proc_lib:spawn by one of the above 
> > gen_server. Do
> > not trap exits
> >     {transient, brutal_kill, worker}
> >  
> > 2 gen_servers which trap_exits but also shutdown when they receive a
> > {'EXIT', Parent, shutdown} message
> >     {permanent, 2000, worker}
> >  
> > 1 supervisor(simple_one_for_one) which supervises two other vanilla
> > gen_servers
> >     {permanent, 5000, supervisor}. Childspec is {transient, 
> > 2000, worker}
> >  
> > How do I track down the rogue process(es)?
> >  
> > tia,
> > Chandru
> >  
> > 
> > 
> 
> 



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