During August 2025, Liu Hu focused on improving the stability and correctness of the apache/brpc repository by addressing a concurrency issue in the event-dispatching mechanism. Liu implemented a targeted bug fix in C++ that restricted the BTHREAD_GLOBAL_PRIORITY flag exclusively to the event dispatcher thread, updating thread attribute initialization to prevent non-dispatcher threads from inheriting this flag. This change reduced the risk of priority conflicts and unintended scheduling behavior under high concurrency. Liu validated the solution with targeted multithreading tests, ensuring reliable event dispatching. The work demonstrated a strong understanding of concurrent programming and thread management within complex C++ systems.