/**
 * @file
 * @brief    Exclusive access lock utility functions.
*/

/* ****************************************************************************
 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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 * Software is furnished to do so, subject to the following conditions:
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 * The above copyright notice and this permission notice shall be included
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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 * $Date: 2018-08-28 22:06:43 +0000 (Tue, 28 Aug 2018) $
 * $Revision: 37425 $
 *
 *************************************************************************** */

/* Define to prevent redundant inclusion */
#ifndef _MXC_LOCK_H_
#define _MXC_LOCK_H_

/* **** Includes **** */
#include "mxc_config.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @ingroup    syscfg
 * @defgroup   mxc_lock_utilities Exclusive Access Locks
 * @brief      Lock functions to obtain and release a variable for exclusive
 *             access. These functions are marked interrupt safe if they are
 *             interrupt safe.
 * @{
 */

/* **** Definitions **** */

/* **** Globals **** */

/* **** Function Prototypes **** */

/**
 * @brief      Attempts to acquire the lock.
 * @details    This in an interrupt safe function that can be used as a mutex.
 *             The lock variable must remain in scope until the lock is
 *             released. Will not block if another thread has already acquired
 *             the lock.
 * @param      lock   Pointer to variable that is used for the lock.
 * @param      value  Value to be place in the lock. Can not be 0.
 *
 * @return     #E_NO_ERROR if everything successful, #E_BUSY if lock is taken.
 */
int mxc_get_lock(uint32_t *lock, uint32_t value);

/**
 * @brief         Free the given lock.
 * @param[in,out] lock  Pointer to the variable used for the lock. When the lock
 *                      is free, the value pointed to by @p lock is set to zero.
 */
void mxc_free_lock(uint32_t *lock);

/**@} end of group mxc_lock_utilities */

#ifdef __cplusplus
}
#endif

#endif /* _MXC_LOCK_H_ */
