#ifndef KERNEL_THREAD_H_
#define KERNEL_THREAD_H_

#include <kernel/msg.h>
#include <kernel/object.h>
#include <kernel/vm-controller.h>

#define THREAD_KSTACK_ORDER VM_PAGE_4K

enum thread_state {
	THREAD_READY = 1,
	THREAD_SLEEPING = 2,
	THREAD_STOPPED = 3,
};

enum thread_flags {
	THREAD_F_NEED_RESCHED = 0x01u,
	THREAD_F_NO_PREEMPT = 0x02u,
};

struct thread {
	struct object thr_base;

	enum thread_state tr_state;
	enum thread_flags tr_flags;
	struct task *tr_parent;

	unsigned int tr_id;
	unsigned int tr_prio;

	cycles_t tr_charge_period_start;
	cycles_t tr_quantum_cycles, tr_quantum_target;
	cycles_t tr_total_cycles;

	virt_addr_t tr_ip, tr_sp, tr_bp;
	virt_addr_t tr_cpu_user_sp, tr_cpu_kernel_sp;

	struct runqueue *tr_rq;
	struct msg tr_msg;
	struct page_request tr_page_req;

	struct queue_entry tr_parent_entry;
	struct queue_entry tr_rqentry;

	struct vm_page *tr_kstack;
	struct vm_object *tr_ustack;
};

extern struct thread *thread_alloc(void);
extern struct thread *thread_cast(struct object *obj);
extern kern_status_t thread_init_kernel(struct thread *thr, virt_addr_t ip);
extern kern_status_t thread_init_user(
	struct thread *thr,
	virt_addr_t ip,
	virt_addr_t sp,
	const uintptr_t *args,
	size_t nr_args);
extern int thread_priority(struct thread *thr);
extern void thread_awaken(struct thread *thr);
extern void idle(void);
extern struct thread *create_kernel_thread(void (*fn)(void));
extern struct thread *create_idle_thread(void);

#endif