File content as of revision 172:65be27845400:

/* 
 * Copyright (c) 2015 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, except as embedded into a Nordic Semiconductor ASA 
 *      integrated circuit in a product or a software update for such product, 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.
 *
 *   4. This software, with or without modification, must only be used with a 
 *      Nordic Semiconductor ASA integrated circuit.
 *
 *   5. Any software provided in binary or object form under this license must not be reverse 
 *      engineered, decompiled, modified and/or disassembled. 
 * 
 * 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
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 */



#ifndef MUTEX_H__
#define MUTEX_H__


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

/**
 * @cond NO_DOXYGEN
 * @defgroup pm_mutex Mutex
 * @ingroup peer_manager
 * @{
 * @brief An internal module of @ref peer_manager. This module provides thread-safe mutexes.
 */


/**@brief Defines the storage size of a specified mutex group.
 *
 * @param number_of_mutexes the number of mutexes in the group.
 */
#define MUTEX_STORAGE_SIZE(number_of_mutexes) ((7 + (number_of_mutexes)) >> 3)


/**@brief Initializes a mutex group.
 *
 * @param[in] p_mutex     Pointer to the mutex group. See @ref MUTEX_STORAGE_SIZE().
 * @param[in] mutex_size  The size of the mutex group in number of mutexes.
 */
void pm_mutex_init(uint8_t * p_mutex, uint16_t mutex_size);


/**@brief Locks the mutex specified by the bit id.
 *
 * @param[inout] p_mutex       Pointer to the mutex group.
 * @param[in]    mutex_bit_id  The bit id of the mutex.
 *
 * @retval true   if it was possible to lock the mutex.
 * @retval false  otherwise.
 */
bool pm_mutex_lock(uint8_t * p_mutex, uint16_t mutex_bit_id);


/**@brief Locks the first unlocked mutex within the mutex group.
 *
 * @param[in, out] p_mutex     Pointer to the mutex group.
 * @param[in]      mutex_size  The size of the mutex group.
 *
 * @return The first unlocked mutex id in the group.
 * @retval group-size  if there was no unlocked mutex available.
 */
uint16_t pm_mutex_lock_first_available(uint8_t * p_mutex, uint16_t mutex_size);


/**@brief Unlocks the mutex specified by the bit id.
 *
 * @param[in, out] p_mutex       Pointer to the mutex group.
 * @param[in]      mutex_bit_id  The bit id of the mutex.
 */
void pm_mutex_unlock(uint8_t * p_mutex, uint16_t mutex_bit_id);


/**@brief Gets the locking status of the specified mutex.
 *
 * @param[in, out] p_mutex      Pointer to the mutex group.
 * @param[in]      mutex_bit_id The bit id of the mutex.
 *
 * @retval true   if the mutex was locked.
 * @retval false  otherwise.
 */
bool pm_mutex_lock_status_get(uint8_t * p_mutex, uint16_t mutex_bit_id);


#endif // MUTEX_H__

/** @} 
 * @endcond  
 */