blob: 95a4f9c15ae853753a596dcb236f456d54548a51 (
plain) (
tree)
|
|
/* rtems/posix/semaphore.h
*
* This include file contains all the private support information for
* POSIX Semaphores.
*
* COPYRIGHT (c) 1989-1999.
* 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.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#ifndef __RTEMS_POSIX_SEMAPHORE_h
#define __RTEMS_POSIX_SEMAPHORE_h
#ifdef __cplusplus
extern "C" {
#endif
#include <semaphore.h>
#include <rtems/score/coresem.h>
#define SEM_FAILED (sem_t *) -1
/*
* Data Structure used to manage a POSIX semaphore
*/
typedef struct {
Objects_Control Object;
int process_shared;
boolean named;
boolean linked;
unsigned32 open_count;
CORE_semaphore_Control Semaphore;
} POSIX_Semaphore_Control;
/*
* The following defines the information control block used to manage
* this class of objects.
*/
POSIX_EXTERN Objects_Information _POSIX_Semaphore_Information;
/*
* _POSIX_Semaphore_Manager_initialization
*
* DESCRIPTION:
*
* This routine performs the initialization necessary for this manager.
*/
void _POSIX_Semaphore_Manager_initialization(
unsigned32 maximum_semaphorees
);
/*
* _POSIX_Semaphore_Allocate
*
* DESCRIPTION:
*
* This function allocates a semaphore control block from
* the inactive chain of free semaphore control blocks.
*/
RTEMS_INLINE_ROUTINE POSIX_Semaphore_Control *_POSIX_Semaphore_Allocate( void );
/*
* _POSIX_Semaphore_Free
*
* DESCRIPTION:
*
* This routine frees a semaphore control block to the
* inactive chain of free semaphore control blocks.
*/
RTEMS_INLINE_ROUTINE void _POSIX_Semaphore_Free (
POSIX_Semaphore_Control *the_semaphore
);
/*
* _POSIX_Semaphore_Get
*
* DESCRIPTION:
*
* This function maps semaphore IDs to semaphore control blocks.
* If ID corresponds to a local semaphore, then it returns
* the_semaphore control pointer which maps to ID and location
* is set to OBJECTS_LOCAL. if the semaphore ID is global and
* resides on a remote node, then location is set to OBJECTS_REMOTE,
* and the_semaphore is undefined. Otherwise, location is set
* to OBJECTS_ERROR and the_semaphore is undefined.
*/
RTEMS_INLINE_ROUTINE POSIX_Semaphore_Control *_POSIX_Semaphore_Get (
Objects_Id *id,
Objects_Locations *location
);
/*
* _POSIX_Semaphore_Is_null
*
* DESCRIPTION:
*
* This function returns TRUE if the_semaphore is NULL and FALSE otherwise.
*/
RTEMS_INLINE_ROUTINE boolean _POSIX_Semaphore_Is_null (
POSIX_Semaphore_Control *the_semaphore
);
/*
* _POSIX_Semaphore_Create_support
*
* DESCRIPTION:
*
* This routine supports the sem_init and sem_open routines.
*/
int _POSIX_Semaphore_Create_support(
const char *name,
int pshared,
unsigned int value,
POSIX_Semaphore_Control **the_sem
);
/*
* _POSIX_Semaphore_Delete
*
* DESCRIPTION:
*
* This routine supports the sem_close and sem_unlink routines.
*/
void _POSIX_Semaphore_Delete(
POSIX_Semaphore_Control *the_semaphore
);
/*
* _POSIX_Semaphore_Wait_support
*
* DESCRIPTION:
*
* This routine supports the sem_wait, sem_trywait, and sem_timedwait
* services.
*/
int _POSIX_Semaphore_Wait_support(
sem_t *sem,
boolean blocking,
Watchdog_Interval timeout
);
/*
* _POSIX_Semaphore_Name_to_id
*
* DESCRIPTION:
*
* This routine performs name to id translation.
*/
int _POSIX_Semaphore_Name_to_id(
const char *name,
Objects_Id *id
);
#include <rtems/posix/semaphore.inl>
#if defined(RTEMS_MULTIPROCESSING)
#include <rtems/posix/semaphoremp.h>
#endif
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
|
