-extern Operation *op_add();
-extern int active_threads;
-extern pthread_mutex_t active_threads_mutex;
-extern pthread_mutex_t new_conn_mutex;
-extern long ops_initiated;
-extern long ops_completed;
-extern pthread_mutex_t ops_mutex;
-extern pthread_t listener_tid;
-
-#ifdef DECL_SYS_ERRLIST
-extern int sys_nerr;
-extern char *sys_errlist[];
-#endif