#ifndef KERNEL_RINGBUF_H_
#define KERNEL_RINGBUF_H_

#include <kernel/wait.h>
#include <magenta/types.h>

struct ringbuf {
	unsigned int buf_read;
	unsigned int buf_write;
	unsigned int buf_capacity;

	unsigned int buf_flags;
	unsigned char *buf_ptr;
	struct waitqueue buf_read_queue;
	struct waitqueue buf_write_queue;
	spin_lock_t buf_lock;

	unsigned char *buf_opened_ptr;
	unsigned int buf_opened_capacity;
};

#define RINGBUF_DECLARE(name, size)                                            \
	static unsigned char __buf_##name[size] = {0};                         \
	static struct ringbuf name = {                                         \
		.buf_ptr = __buf_##name,                                       \
		.buf_capacity = size,                                          \
	}

extern kern_status_t ringbuf_lock(struct ringbuf *buf, unsigned long *flags);
extern kern_status_t ringbuf_unlock(struct ringbuf *buf, unsigned long flags);

extern kern_status_t ringbuf_read(
	struct ringbuf *buf,
	void *out,
	size_t count,
	size_t *nr_read,
	unsigned long *irq_flags);
extern kern_status_t ringbuf_write(
	struct ringbuf *buf,
	const void *out,
	size_t count,
	size_t *nr_written,
	unsigned long *irq_flags);

#endif