typedef void thread_func (void *aux);
tid_t thread_create (const char *name, int priority, thread_func *, void *);
+void thread_block (void);
void thread_unblock (struct thread *);
struct thread *thread_current (void);
void thread_exit (void) NO_RETURN;
void thread_yield (void);
-void thread_block (void);
/* This function will be implemented in problem 1-2. */
void thread_join (tid_t);