libwebsockets by default allocates support for multithreaded consumers
(the library itself is singlethreaded) and then requires consumers to
"implement locking in the user code in the same way that
libwebsockets-test-server-pthread does it" - and not doing so apparently
causes occational deadlocks.

Discussed at https://github.com/meetecho/janus-gateway/issues/732 where
the Janus developer were adviced by the libwebsocket developers to set
- -DLWS_MAX_SMP=0 and that seems to have solved the issue in Janus.

The option is documented here:
https://libwebsockets.org/lws-api-doc-master/html/md_README_8coding.html#smp


Please build libwebsockets with -DLWS_MAX_SMP=0 to avoid such deadlocks.


 - Jonas
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