Changes

• Replaced std::unique_lock<std::mutex> with std::lock_guard<std::mutex> in the accept handler since deferred locking is not needed.
• Used move semantics (std::move(s)) when pushing the session into the container to avoid unnecessary shared_ptr copies.

Why

• lock_guard is lighter than unique_lock and more suitable for this frequent operation (accepting connections).
• Move semantics avoid atomic reference counting operations, which can improve performance in high-concurrency scenarios.

Modified Files

• Lib/rpc/server.cc (the start_accept method)

Testing

• Code compiles without errors.
• Basic functionality tested and works correctly.