#pragma once

#include "list.h"
#include "memory.h"
#include "types.h"

#include <stdint.h>

extern struct task *current_task;

enum status { ZOMBIE, THREAD, RUN, WAIT, SLEEP, STOPPED, FORKED };
enum owner { OWNER_KERNEL, OWNER_USER };

#define STACK_SIZE PAGE_SIZE * 4

struct task {
	u8 *esp;
	u8 *esp0;
	u32 *cr3;  // physical
	u32 *heap; // virtual
	u32 *eip;
	u16 pid;
	u8 status;
	u8 uid;
	struct task *daddy;
	struct task *child;
	struct list **signals;
	struct task *next;
	struct task *prev;
};

void scheduler(void);
void switch_to_task(struct task *next_task);
struct task *create_task(u8 uid);
i8 create_kernel_task(void);
void remove_task(struct task *task);
struct task *copy_task(const struct task *task);
void kfork(struct task *daddy);

// utils
void exec_fn(void (*fn)(void));
u16 fork(void);
u16 wait(void);