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Current File : //usr/src/file_protector-1.1-1549/transport/ring.h
/**
@file
@brief    'ring' or 'circular' buffer
@details  Copyright (c) 2021 Acronis International GmbH
@author   Mikhail Krivtsov (mikhail.krivtsov@acronis.com)
@since    $Id: $
*/

#pragma once

#include <linux/atomic.h>
#include <linux/types.h>	// bool, [u]int(8|16|32|64)_t, pid_t, size_t
#ifdef KERNEL_MOCK
#include <mock/mock.h>
#endif

typedef struct {
	void *buffer;
	size_t item_size;
	int capacity;
	// 'count' is marked as atomic because it might be called from 'wait_event*' call without taking a spinlock
	atomic_t count;
	int count_max;
	int producer_index;
	int consumer_index;
} ring_t;

static inline
void ring_init(ring_t *ring, void *buffer, size_t buffer_size, size_t item_size)
{
	ring->buffer = buffer;
	ring->item_size = item_size;
	ring->capacity = buffer_size / item_size;
	atomic_set(&ring->count, 0);
	ring->count_max = 0;
	ring->producer_index = 0;
	ring->consumer_index = 0;
}

static inline
void *ring_buffer(ring_t *ring)
{
	return ring->buffer;
}

static inline
int ring_capacity(ring_t *ring)
{
	return ring->capacity;
}

static inline
void ring_producer_index_move(ring_t *ring, int items)
{
	int count;
	ring->producer_index = (ring->producer_index + items) % ring->capacity;
	count = atomic_add_return(items, &ring->count);
	if (ring->count_max < count) {
		ring->count_max = count;
	}
}

static inline
void ring_producer_index_move_one(ring_t *ring)
{
	ring_producer_index_move(ring, 1);
}

static inline
void *ring_producer_ptr(ring_t *ring)
{
	return (void *) (ring->producer_index * ring->item_size + (char *)ring->buffer);
}

static inline
void ring_consumer_index_move(ring_t *ring, int items)
{
	ring->consumer_index = (ring->consumer_index + items) % ring->capacity;
	atomic_sub(items, &ring->count);
}

static inline
void ring_consumer_index_move_one(ring_t *ring)
{
	ring_consumer_index_move(ring, 1);
}

static inline
void *ring_consumer_ptr(ring_t *ring)
{
	return (void *) (ring->consumer_index * ring->item_size + (char *)ring->buffer);
}

static inline
int ring_items_count(ring_t *ring)
{
	return atomic_read(&ring->count);
}

static inline
int ring_items_count_max(ring_t *ring)
{
	return ring->count_max;
}

static inline
bool ring_is_empty(ring_t *ring)
{
	return !ring_items_count(ring);
}

static inline
bool ring_is_full(ring_t *ring)
{
	return ring_items_count(ring) >= ring->capacity;
}

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