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J. Nick Koston
f4a055f342
AsyncEventSource::handleRequest() runs on the ESP-IDF httpd task. Prior to this change it mutated sessions_, event_buffer_, deferred_queue_, and entities_iterator_ directly: appending the new response to sessions_, sending the initial ping/config/sorting_groups through try_send_nodefer() (which writes event_buffer_), and calling entities_iterator_.begin(). The main loop reads/writes the same fields from WebServer::loop() on the main task, so every new SSE connect raced with any in-flight loop tick. The httpd path now only performs the HTTP-level setup that requires the live httpd_req_t (headers, initial chunk, sess_ctx/free_ctx, fd_, send override) and parks the response on pending_sessions_ under a mutex. The main loop checks a std::atomic<bool> fast-path gate per tick; when set it swaps the pending list out under the lock and then — outside the lock — pushes into sessions_, invokes on_connect_, and calls prime_() which performs the initial sends and starts entities_iterator_. sessions_, event_buffer_, deferred_queue_, and entities_iterator_ are now mutated exclusively from the main loop. fd_ remains the only cross-thread signal (std::atomic<int> cleared by destroy() on the httpd/tcpip task).
