[erlang-questions] broadcast message to all gen_server

Tilman Holschuh <>
Wed Apr 11 01:09:09 CEST 2012

And this doesn't work for you?


It's a cast and you can supply the pid (just wondering why he explicitly 
returns ok but that doesn't matter).

- Tilman

On 12-04-10 03:01 PM, AD wrote:
> the gen_server is part of the sockjs server and i was trying to not
> modify/fork his code and leverage what is already there. Currently he uses
> a handle_call() so was looking at handling it outside his code.
> -AD
> On Tue, Apr 10, 2012 at 4:18 PM, Tilman Holschuh
> <>wrote:
>> On 12-04-10 12:37 PM, AD wrote:
>>>   I have a situation where i am trying to handle a case where I am using
>>> sockjs and need to send a message to each sockjs session_server (which is
>>> a
>>> gen_server).  I am using gproc() but I cant simply do a gproc_send() b/c
>>> the message ends up in handle_info() instead of properly in handle_call().
>>>   I have managed to work this out, when receiving a message from rabbitmq i
>>> do a gproc:lookup_pids() and then loop through each pid and do a
>>> gen_server:call(PID,Message).  The issue is this is a linear process, is
>>> there a way to handle sending gen_server:call() to all the processes
>>> concurrently ?
>> Do you need a response from the gen_server:call? If not you could just use
>> a cast instead. Something like:
>> [gen_server:cast(Pid, Message) || Pid<- gproc:lookup_pids()]
>> Cheers
>> - Tilman
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