/*
 * Copyright (c) 2018-2019 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/* Structure used to double buffer pointers of AD Data PDU buffer.
 * The first and last members are used to make modification to AD data to be
 * context safe. Thread always appends or updates the buffer pointed to
 * the array element indexed by the member last.
 * LLL in the ISR context, checks, traverses to the valid pointer indexed
 * by the member first, such that the buffer is the latest committed by
 * the thread context.
 */
struct lll_adv_pdu {
	uint8_t volatile first;
	uint8_t last;
	uint8_t *pdu[DOUBLE_BUFFER_SIZE];
#if defined(CONFIG_BT_CTLR_ADV_EXT_PDU_EXTRA_DATA_MEMORY)
	/* This is a storage for LLL configuration that may be
	 * changed while LLL advertising role is started.
	 * Also it makes the configuration data to be in sync
	 * with extended advertising PDU e.g. CTE TX configuration
	 * and CTEInfo field.
	 */
	void *extra_data[DOUBLE_BUFFER_SIZE];
#endif /* CONFIG_BT_CTLR_ADV_EXT_PDU_EXTRA_DATA_MEMORY */
};