#ifndef KERNEL_CHANNEL_H_
#define KERNEL_CHANNEL_H_

#include <kernel/object.h>
#include <kernel/sched.h>

struct kmsg;

struct channel {
	struct object c_base;
	unsigned int c_id;
	struct waitqueue c_wq;
	struct btree c_msg;
	struct btree_node c_node;
};

extern kern_status_t channel_type_init(void);

extern struct channel *channel_create(void);

extern kern_status_t channel_enqueue_msg(
	struct channel *channel,
	struct kmsg *msg);

extern kern_status_t channel_recv_msg(
	struct channel *channel,
	struct msg *out_msg,
	msgid_t *out_id,
	unsigned long *irq_flags);
extern kern_status_t channel_reply_msg(
	struct channel *channel,
	msgid_t id,
	const struct msg *resp,
	unsigned long *irq_flags);

extern kern_status_t channel_read_msg(
	struct channel *channel,
	msgid_t msg,
	size_t offset,
	void *buf,
	size_t len,
	size_t *nr_read);
extern kern_status_t channel_write_msg(
	struct channel *channel,
	msgid_t msg,
	size_t offset,
	const void *buf,
	size_t len,
	size_t *nr_written);

DEFINE_OBJECT_LOCK_FUNCTION(channel, c_base)

#endif