Protection against race conditions: Added a global mutex (session_mutex) to synchronize access to the session() function when multiple threads are running. This avoids concurrency problems in environments with many simultaneous connections.
Thread pool usage: Replaced manual thread creation with boost::thread with a thread pool using boost::asio::thread_pool. The thread pool improves resource management and limits the number of simultaneous threads, optimizing performance.
Checking for socket errors: Added check to ensure the socket is not null or closed before trying to read it.
Implemented detailed error handling for readings and writings, including detailed logs to facilitate debugging.
Secure socket closure: Now sockets are correctly closed at the end of the session, even in the event of an error, preventing resource leaks.
