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/**
* @file
*
* @ingroup ScoreAPIMutex
*
* @brief API Mutex Handler API
*/
/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_APIMUTEX_H
#define _RTEMS_SCORE_APIMUTEX_H
#include <rtems/score/coremutex.h>
#include <rtems/score/object.h>
/**
* @defgroup ScoreAPIMutex API Mutex Handler
*
* @ingroup Score
*
* @brief Provides routines to ensure mutual exclusion on API level.
*/
/**@{**/
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Control block used to manage each API mutex.
*/
typedef struct {
/**
* @brief Allows each API Mutex to be a full-fledged RTEMS object.
*/
Objects_Control Object;
/**
* Contains the SuperCore mutex information.
*/
CORE_recursive_mutex_Control Mutex;
/**
* @brief The thread life protection state before the outer-most mutex
* obtain.
*/
Thread_Life_state previous_thread_life_state;
} API_Mutex_Control;
/**
* @brief Initialization for the API Mutexe Handler.
*
* The value @a maximum_mutexes is the maximum number of API mutexes that may
* exist at any time.
*
* @param[in] maximum_mutexes is the maximum number of API mutexes.
*/
void _API_Mutex_Initialization( uint32_t maximum_mutexes );
/**
* @brief Allocates an API mutex from the inactive set and returns it in
* @a mutex.
*/
void _API_Mutex_Allocate( API_Mutex_Control **mutex );
/**
* @brief Acquires the specified API mutex.
*
* @param[in] mutex The API mutex.
*/
void _API_Mutex_Lock( API_Mutex_Control *mutex );
/**
* @brief Releases the specified API mutex.
*
* @param[in] mutex The API mutex.
*/
void _API_Mutex_Unlock( API_Mutex_Control *mutex );
/**
* @brief Checks if the specified API mutex is owned by the executing thread.
*
* @param[in] mutex The API mutex.
*/
bool _API_Mutex_Is_owner( const API_Mutex_Control *mutex );
/** @} */
/**
* @defgroup ScoreAllocatorMutex RTEMS Allocator Mutex
*
* @ingroup ScoreAPIMutex
*
* @brief Protection for all memory allocations and deallocations in RTEMS.
*
* When the APIs all use this for allocation and deallocation protection, then
* this possibly should be renamed and moved to a higher level in the
* hierarchy.
*/
/**@{**/
/**
* @brief Memory allocation mutex.
*
* This points to the API Mutex instance used to ensure that only
* one thread at a time is allocating or freeing memory.
*/
extern API_Mutex_Control *_RTEMS_Allocator_Mutex;
static inline void _RTEMS_Lock_allocator( void )
{
_API_Mutex_Lock( _RTEMS_Allocator_Mutex );
}
static inline void _RTEMS_Unlock_allocator( void )
{
_API_Mutex_Unlock( _RTEMS_Allocator_Mutex );
}
static inline bool _RTEMS_Allocator_is_owner( void )
{
return _API_Mutex_Is_owner( _RTEMS_Allocator_Mutex );
}
extern API_Mutex_Control *_Once_Mutex;
static inline void _Once_Lock( void )
{
_API_Mutex_Lock( _Once_Mutex );
}
static inline void _Once_Unlock( void )
{
_API_Mutex_Unlock( _Once_Mutex );
}
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
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