#pragma once

#include "list.h"
#include "memory.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 {
	uint8_t *esp;
	uint8_t *esp0;
	uint32_t *cr3;  // physical
	uint32_t *heap; // virtual
	uint32_t *eip;
	uint16_t pid;
	uint8_t status;
	uint8_t 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(uint8_t uid);
int8_t create_kernel_task(void);
void remove_task(struct task *task);
struct task *copy_task(const struct task *task);
void kfork(struct task *daddy);
void zombify_task(struct task *task);

// utils
void exec_fn(void (*fn)(void));
uint16_t fork(void);
uint16_t wait(void);