/* Copyright (c) 2017 - 2018, Nordic Semiconductor ASA
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice, this
 *      list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *
 *   3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *      contributors may be used to endorse or promote products derived from
 *      this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */

#ifndef NRF_802154_CRITICAL_SECTION_H__
#define NRF_802154_CRITICAL_SECTION_H__

#include <stdbool.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @defgroup nrf_802154_critical_section 802.15.4 driver critical section
 * @{
 * @ingroup nrf_802154
 * @brief Critical section used with requests to the 802.15.4 driver.
 */

/**
 * @brief Initializes the critical section module.
 */
void nrf_802154_critical_section_init(void);

/**
 * @brief Function for entering a critical section in the 802.15.4 driver.
 *
 * @retval true   The critical section is entered.
 * @retval false  The critical section could not be entered.
 */
bool nrf_802154_critical_section_enter(void);

/**
 * @brief Function for exiting a critical section in the 802.15.4 driver.
 */
void nrf_802154_critical_section_exit(void);

/**
 * @brief Function for forcefully entering a critical section in the 802.15.4 driver.
 *
 * With this function, the critical section is entered regardless of whether
 * it has been already entered before.
 *
 * This function is intended to be used by RADIO IRQ handler and RSCH notifications handlers to
 * prevent interrupting of these procedures by FSM requests from higher priority IRQ handlers.
 */
void nrf_802154_critical_section_forcefully_enter(void);

/**
 * @brief Allows entry to a nested critical section.
 *
 * This function is intended to be used with the notification module to allow processing
 * requests called from the notification context.
 */
void nrf_802154_critical_section_nesting_allow(void);

/**
 * @brief Denies entry to a nested critical section.
 */
void nrf_802154_critical_section_nesting_deny(void);

/**
 * @brief Checks if the critical section is nested.
 *
 * @retval true   Critical section is nested.
 * @retval false  Critical section is not nested.
 */
bool nrf_802154_critical_section_is_nested(void);

/**
 * @brief Gets the current IRQ priority.
 *
 * @returns IRQ priority
 */
uint32_t nrf_802154_critical_section_active_vector_priority_get(void);

/**
 * @brief Function for entering a critical section in the RSCH module.
 */
extern void nrf_802154_critical_section_rsch_enter(void);

/**
 * @brief Function for exiting a critical section in the RSCH module.
 */
extern void nrf_802154_critical_section_rsch_exit(void);

/**
 * @brief Checks if there is a pending event in the RSCH critical section.
 */
extern bool nrf_802154_critical_section_rsch_event_is_pending(void);

/**
 *@}
 **/

#ifdef __cplusplus
}
#endif

#endif // NRF_802154_CRITICAL_SECTION_H__