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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#pragma once
/**
* Ring buffer is empty
*/
bool is_empty_state(struct aws_ring_buffer *ring_buf) {
uint8_t *head = aws_atomic_load_ptr(&ring_buf->head);
uint8_t *tail = aws_atomic_load_ptr(&ring_buf->tail);
return tail == head;
}
/**
* Ring buffer is valid [allocation==tail...head)
*/
bool is_front_valid_state(struct aws_ring_buffer *ring_buf) {
uint8_t *head = aws_atomic_load_ptr(&ring_buf->head);
uint8_t *tail = aws_atomic_load_ptr(&ring_buf->tail);
return ring_buf->allocation == tail && tail < head;
}
/**
* Ring buffer is valid [allocation<tail...head) (not front_valid)
*/
bool is_middle_valid_state(struct aws_ring_buffer *ring_buf) {
uint8_t *head = aws_atomic_load_ptr(&ring_buf->head);
uint8_t *tail = aws_atomic_load_ptr(&ring_buf->tail);
return ring_buf->allocation < tail && tail < head;
}
/**
* Ring buffer is valid [allocation...head) and [tail...allocation_end)
*/
bool is_ends_valid_state(struct aws_ring_buffer *ring_buf) {
uint8_t *head = aws_atomic_load_ptr(&ring_buf->head);
uint8_t *tail = aws_atomic_load_ptr(&ring_buf->tail);
return tail > head;
}
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