[rabbitmq-discuss] Pika and multi-threading

Denis Conan Denis.Conan at telecom-sudparis.eu
Wed Feb 23 15:33:05 GMT 2011

Le 23/02/2011 16:28, Gavin M. Roy a écrit :
> 2011/2/23 Denis Conan <Denis.Conan at telecom-sudparis.eu
> <mailto:Denis.Conan at telecom-sudparis.eu>>
>     Le 22/02/2011 17:02, Gavin M. Roy a écrit :
>         2011/2/22 Denis Conan<Denis.Conan at telecom-sudparis.eu
>         <mailto:Denis.Conan at telecom-sudparis.eu>>:
>             Hi all,
>             The Pika Web site says: "Pika does not have any notion of
>             threading in the
>             code. If you want to use Pika with threading, make sure you
>             have a Pika
>             connection per thread, created in that thread. It is not
>             safe to share one
>             Pika connection across threads."
>             When using the continuation-passing style mode with
>             SelectConnection, what
>             about the singleton object IOLoop? I created a connection on
>             the main thread
>             for a vhost, and then a second connection for a different
>             vhost in a new
>             thread, but callbacks of the main threads for the first
>             vhost are called. Am
>             I missing something?
>         You're not, this is something I'm working through now. In essence,
>         there is a logical separation in the pika code between the core
>         of how
>         pika does what it does and the connection adapters. The singleton
>         model for ioloops was a later addition that broke the model with
>         regard to threads. I have been working on fixing this to be thread
>         safe and will have something out soon on it.
>     Thank your for the answer.
>     In the meantime, forking the process may be an alternative. Is there
>     a "simple" mean to de-register a callback?
> Simple is relative to how deep the it was that the callback was
> registered. What type of callback do you want to unregister?

The one for the treatment of delivered messages that was registered in a 

> Gavin

Denis Conan
Institut Télécom, Télécom SudParis

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