typedef int tid_t;
#define TID_ERROR ((tid_t) -1) /* Error value for tid_t. */
+/* Thread priorities. */
+#define PRI_MIN 0 /* Lowest priority. */
+#define PRI_DEFAULT 29 /* Default priority. */
+#define PRI_MAX 59 /* Highest priority. */
+
/* A kernel thread or user process.
Each thread structure is stored in its own 4 kB page. The
blocked state is on a semaphore wait list. */
struct thread
{
- /* These members are owned by thread.c. */
+ /* Owned by thread.c. */
tid_t tid; /* Thread identifier. */
enum thread_status status; /* Thread state. */
char name[16]; /* Name (for debugging purposes). */
uint8_t *stack; /* Saved stack pointer. */
+ int priority; /* Priority. */
/* Shared between thread.c and synch.c. */
list_elem elem; /* List element. */
#ifdef USERPROG
- /* These members are owned by userprog/addrspace.c. */
+ /* Owned by userprog/addrspace.c. */
uint32_t *pagedir; /* Page directory. */
#endif
- /* Marker to detect stack overflow. */
- unsigned magic; /* Always set to THREAD_MAGIC. */
+ /* Owned by thread.c */
+ unsigned magic; /* Detects stack overflow. */
};
void thread_init (void);
void thread_start (void);
typedef void thread_func (void *aux);
-tid_t thread_create (const char *name, thread_func *, void *);
+tid_t thread_create (const char *name, int priority, thread_func *, void *);
#ifdef USERPROG
tid_t thread_execute (const char *filename);
#endif
void thread_yield (void);
void thread_block (void);
-/* These functions will be implemented in project 1. */
+/* This function will be implemented in problem 1-2. */
void thread_join (tid_t);
-void thread_set_priority (tid_t, int);
-int thread_get_priority (tid_t);
+
+/* These functions will be implemented in problem 1-3. */
+void thread_set_priority (int);
+int thread_get_priority (void);
#endif /* threads/thread.h */