[zeromq-dev] zbeacon deadlock

[Pieter Hintjens]

Nice catch. I've reproduced and fixed the error.

https://github.com/hintjens/czmq/commit/dc7b95b5f673ca42c63850d337b46146de0da8d6



On Tue, Jan 28, 2014 at 1:40 AM, Max Drechsler
<mdrechsler at rst-automation.de> wrote:
> I recently found a deadlock when using czmq's zbeacon_t.
> Code to reproduce:
>
> int main()
> {
>     zbeacon_t* beacon = zbeacon_new( 2000 );
>     assert( beacon );
>     zbeacon_publish( beacon, (byte*)"Hello", 6 );
>     zbeacon_subscribe( beacon, 0, 0 );
>     while (!zctx_interrupted)
>     {
>          zmsg_t* msg = zmsg_recv( zbeacon_socket(beacon) );
>          zmsg_destroy( &msg );
>     }
>
>     // Do some long term cleanups..
>     sleep(1);
>     zbeacon_destroy( &beacon );
> }
>
> Once SIGINT or SIGTERM are sent to the process, the zbeacons agent task
> exits the processing loop, so that the final destroy can't send TERMINATE to
> the  agent. So the application gets stuck in zbeacon_destroy.
> My suggestion is to not test for zctx_interrupted in the s_agent_task
> function, so that the user can control the cleanup process.
>
> Kind Regards
> Max Drechsler
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