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/* apimutex.h
*
* This include file contains all the constants and structures associated
* with the API Mutex Handler. This handler is used by API level
* routines to manage mutual exclusion.
*
* COPYRIGHT (c) 1989-2002.
* 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.com/license/LICENSE.
*
* $Id$
*/
#ifndef __API_MUTEX_h
#define __API_MUTEX_h
#ifdef __cplusplus
extern "C" {
#endif
#include <rtems/score/coremutex.h>
#include <rtems/score/isr.h>
#include <rtems/score/object.h>
/*
* The following defines the control block used to manage each mutex.
*/
typedef struct {
Objects_Control Object;
CORE_mutex_Control Mutex;
} API_Mutex_Control;
/*
* The following defines the information control block used to manage
* this class of objects.
*/
SCORE_EXTERN Objects_Information _API_Mutex_Information;
/*
* _API_Mutex_Initialization
*
* DESCRIPTION:
*
* This routine performs the initialization necessary for this handler.
*/
#if defined(RTEMS_MULTIPROCESSING)
#define _API_Mutex_Initialization( _maximum_mutexes ) \
_Objects_Initialize_information( \
&_API_Mutex_Information, \
OBJECTS_INTERNAL_API, \
OBJECTS_INTERNAL_MUTEXES, \
_maximum_mutexes, \
sizeof( API_Mutex_Control ), \
FALSE, \
0, \
FALSE, \
NULL \
);
#else
#define _API_Mutex_Initialization( _maximum_mutexes ) \
_Objects_Initialize_information( \
&_API_Mutex_Information, \
OBJECTS_INTERNAL_API, \
OBJECTS_INTERNAL_MUTEXES, \
_maximum_mutexes, \
sizeof( API_Mutex_Control ), \
FALSE, \
0 \
);
#endif
/*
* _API_Mutex_Allocate
*
* DESCRIPTION:
*
* This routine allocates an api mutex from the inactive set.
*/
#define _API_Mutex_Allocate( _the_mutex ) \
do { \
CORE_mutex_Attributes attr = \
{ CORE_MUTEX_NESTING_IS_ERROR, FALSE, \
CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT, 0 }; \
(_the_mutex) = (API_Mutex_Control *) \
_Objects_Allocate( &_API_Mutex_Information ); \
_CORE_mutex_Initialize( \
&(_the_mutex)->Mutex, &attr, CORE_MUTEX_UNLOCKED ); \
} while (0)
/*
* _API_Mutex_Lock
*
* DESCRIPTION:
*
* This routine acquires the specified api mutex.
*/
#define _API_Mutex_Lock( _the_mutex ) \
do { \
ISR_Level _level; \
_ISR_Disable( _level ); \
_CORE_mutex_Seize( \
&(_the_mutex)->Mutex, (_the_mutex)->Object.id, TRUE, 0, (_level) ); \
} while (0)
/*
* _API_Mutex_Unlock
*
* DESCRIPTION:
*
* This routine releases the specified api mutex.
*/
#define _API_Mutex_Unlock( _the_mutex ) \
do { \
_Thread_Disable_dispatch(); \
_CORE_mutex_Surrender( \
&(_the_mutex)->Mutex, (_the_mutex)->Object.id, NULL ); \
_Thread_Enable_dispatch(); \
} while (0);
/*XXX when the APIs all use this for allocation and deallocation
*XXX protection, then they should be renamed and probably moved
*/
SCORE_EXTERN API_Mutex_Control *_RTEMS_Allocator_Mutex;
#define _RTEMS_Lock_allocator() \
_API_Mutex_Lock( _RTEMS_Allocator_Mutex )
#define _RTEMS_Unlock_allocator() \
_API_Mutex_Unlock( _RTEMS_Allocator_Mutex )
/*
* There are no inlines for this handler.
*/
#ifndef __RTEMS_APPLICATION__
/* #include <rtems/score/apimutex.inl> */
#endif
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
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