[erlang-questions] global:registered_names() returns []

Ulf Wiger <>
Wed Oct 22 22:12:26 CEST 2008


You must tell gen_server:call() that it's a global name.

BR,
Ulf W

2008/10/22, Adrian Balij <>:
> Thank you Andrew, that did work and I was able to see the registered names
> on both nodes.
>
> It is odd how in books such as Programming Erlang by Joe and the videos by
> Kevin Smith never mention the need to use net_kernel:connect and somehow
> their examples seem to work. Maybe I missed something or my lack of
> experience cannot answer this odd scenario.
>
> Although your solution worked, I ran into another problem. Both nodes can
> see the registered names: [account_monitor]
>
> However, when I call gen_server:start_link for the first time, the name does
> not get registered! However any subsequent calls (without terminating the
> node) causes the process to register!!
>
> On top of that, when I call gen_server:call(account_monitor, getOnlineUsers)
> , I get the error:
>
> *exception exit: {noproc, {gen_server, call,[account_monitor,
> getOnlineUsers]}}
>
> Any have any ideas why?
>
> Sincerely,
>
> Adrian Balij
> Software Engineer
> Musket/Melburn Group
>
>
> -----Original Message-----
> From: Andrew Stone [mailto:]
> Sent: October 22, 2008 1:05 PM
> To: 
> Subject: Re: [erlang-questions] global:registered_names() returns []
>
> Adrian,
>
> I think you want to call net_kernel:connect right before you call
> global:sync. That will actually connect the two nodes. Then global:sync will
> synch the names on each node.
>
> -Andrew
>
>
>
> ----- Original Message ----
> From: "" <>
> To: 
> Sent: Tuesday, October 21, 2008 4:24:39 PM
> Subject: [erlang-questions] global:registered_names() returns []
>
> Hello everyone,
>
> I am fairly new to Erlang and I have been trying to setup a gen_server so
> that other nodes can communicate with it. However, on the client nodes,
> every time I call global:registered_names(), it returns []. The odd thing
> is on the server node, calling global:registered_names() returns
> [account_monitor].
>
> I am running two consoles on the same computer using the following commands:
>
> erl -sname  -setcookie Test
>
> erl -sname  -setcookie Test
>
> Both consoles can ping each other.
>
> My start function is:
>
> % Initialize routine
> start_link() -> gen_server:start_link({global, ?MODULE}, ?MODULE, [], []).
>
> where ?MODULE = account_monitor.
>
> I tried calling net_adm:world() and global:sync() and no luck at all!
>
> The gen_server works fine (and by fine, I mean calling
> gen_server:call(...)) when I start it locally (start_link({local, ?MODULE}
> ....).
>
> Any help or suggestions would be extremely helpful at this point!
>
> Additional info:
> - OS: Leopard 10.5
> - Erang bin: Sep 3, 2008
>
> Thank you for your time,
>
> Adrian Balij
>
>
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