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/**
* @file thr_internals.h
* @author Hanjie Wu (hanjiew)
* @author Devang Acharya (devanga)
* @brief tcb structure and management functions and excpetion stack
* @date 2023-02-22
*
*/
#ifndef THR_INTERNALS_H
#define THR_INTERNALS_H
#include <stdint.h>
#include <cond.h>
#include <mutex.h>
#include <syscall.h>
/**
* @brief stack for excpetion handler
*/
extern char ex_stack[];
/**
* @brief pointer to the highest address of exception stack
*/
extern void* ex_stack_end;
/**
* @brief thread control block structure
*/
typedef struct tcb_s {
int tid; /* thread id */
uintptr_t stack_lo; /* low limit of stack */
uintptr_t stack_hi; /* high limit of stack */
int is_main; /* is main thread */
int color; /* rbtree color */
struct tcb_s* parent; /* rbtree parent */
struct tcb_s* left; /* rbtree left node */
struct tcb_s* right; /* rbtree right node */
struct tcb_s* mutex_next; /* queue for block on mutex */
struct tcb_s* mutex_prev; /* queue for block on mutex */
int mutex_resume; /* flag to show is other thread is going to resume this
thread */
int waiter; /* tid of other thread that called thr_join on it */
int exited; /* is exited */
void* exit_value; /* return value */
cond_t wait_cv; /* cv to wait for thread exit */
} tcb_t;
/**
* @brief tcb for main thread
*/
extern tcb_t main_tcb;
/**
* @brief find tcb by thread id
*/
tcb_t* rb_find_tcb(int tid);
/**
* @brief insert tcb into rbtree
*/
void rb_insert_tcb(tcb_t* tcb);
/**
* @brief delete tcb from rbtree
*/
void rb_delete_tcb(tcb_t* tcb);
#define PAGE_ALIGN_MASK ((uintptr_t) ~((uintptr_t)(PAGE_SIZE - 1)))
#endif
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