#ifndef KERNEL_MSG_H_
#define KERNEL_MSG_H_

#include <kernel/btree.h>
#include <kernel/locks.h>
#include <mango/status.h>
#include <mango/types.h>

struct port;
struct thread;

enum kmsg_status {
	KMSG_WAIT_RECEIVE,
	KMSG_WAIT_REPLY,
	KMSG_REPLY_SENT,
	KMSG_ASYNC,
};

struct msg {
	spin_lock_t msg_lock;
	enum kmsg_status msg_status;
	struct btree_node msg_node;
	msgid_t msg_id;
	struct port *msg_sender_port;
	struct thread *msg_sender_thread;
	kern_status_t msg_result;
	kern_msg_type_t msg_type;

	union {
		/* msg_type = KERN_MSG_TYPE_DATA */
		struct {
			kern_msg_t msg_req, msg_resp;
		};

		/* msg_type = KERN_MSG_TYPE_EVENT */
		struct {
			kern_msg_event_type_t msg_event;
		};
	};
};

extern void msg_init(void);
extern struct msg *msg_alloc(void);
extern void msg_free(struct msg *msg);

#endif