[xmlblaster-devel] Re: Deadlock with PtP messages

[Marcel Ruff <mr at marcelruff.info>]

Xavier Roques wrote:

> Hi marcel,
>
> I'm going to test and I will confirm you if it works.
>
> Could you explain why did it happen ?

1. The publisher enters
  synchronized(topicHandler)
and then wants to put the message into the queue
and enters
  synchronized(callbackQueue)

2. The callbackWorker thread enters
  synchronized(callbackQueue)
to delete a just delivered message
this queue entry notifies the topic
that it is not needed anymore and enters
  synchronized(topicHandler)


--> and here we have a classical deadlock !

This is resolved - now the publisher is
not in a synchronized(topicHandler) anymore
when it puts the message into the callback queue.

(Note: In pub/sub mode this was already correct implemented)

thanks for your help

Marcel

> Thanks for your quick answer
>
> Xav.
>
> -----Original Message-----
> From: Marcel Ruff [mailto:mr at marcelruff.info]
> Sent: Wednesday, February 12, 2003 12:59 PM
> To: Xavier Roques
> Cc: Michele Laghi; mr at marcelruff.info
> Subject: Re: Message changes size
>
>
> Xavier Roques wrote:
>
>
> >Hi Marcel,
> >
> >I attached the zipped log file, and a zip file containing the stack of
> >the two hang threads.
> >
> >I hope that it will help.
> >