thread_lock_flags_
thread_lock_flags_(td, opts, file, line);
thread_lock_flags_(td, 0, 0, 0);
void thread_lock_flags_(struct thread *, int, const char *, int);
thread_lock_flags_((tdp), 0, __FILE__, __LINE__)
thread_lock_flags_((tdp), (opt), __FILE__, __LINE__)