Thank you for clear cut explanation!

thank you a lot!

Thank you for the answer! Yes, the ES is being planned to be used in daemon. As far as I know the number of ES clients is limited by the system. Are there any constant which defines this number? (headers) Can I create several ES clients in my daemon? Are there any limitations like a races in case of calling es_subscribe()/es_unsubscribe() in running client? Can I manage subscription by a fly? Can I use posix mutexs in functions which are called inside the block? Should we take care of signals while being in the block? Can/should we block some? Can we fork a new thread/process out of the block? Thank you for support!