sem.c

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*
 *  Semaphore Manager
 *
 *  DESCRIPTION:
 *
 *  This package is the implementation of the Semaphore Manager.
 *  This manager utilizes standard Dijkstra counting semaphores to provide
 *  synchronization and mutual exclusion capabilities.
 *
 *  Directives provided are:
 *
 *     + create a semaphore
 *     + get an ID of a semaphore
 *     + delete a semaphore
 *     + acquire a semaphore
 *     + release a semaphore
 *
 *  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.rtems.com/license/LICENSE.
 *
 *  $Id: sem.c,v 1.22.2.1 2003/09/04 18:47:17 joel Exp $
 */

#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/rtems/attr.h>
#include <rtems/score/isr.h>
#include <rtems/score/object.h>
#include <rtems/rtems/options.h>
#include <rtems/rtems/sem.h>
#include <rtems/score/coremutex.h>
#include <rtems/score/coresem.h>
#include <rtems/score/states.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#if defined(RTEMS_MULTIPROCESSING)
#include <rtems/score/mpci.h>
#endif
#include <rtems/score/sysstate.h>

#include <rtems/score/interr.h>

/*PAGE
 *
 *  _Semaphore_Manager_initialization
 *
 *  This routine initializes all semaphore manager related data structures.
 *
 *  Input parameters:
 *    maximum_semaphores - maximum configured semaphores
 *
 *  Output parameters:  NONE
 */

void _Semaphore_Manager_initialization(
  unsigned32 maximum_semaphores
)
{
  _Objects_Initialize_information(
    &_Semaphore_Information,     /* object information table */
    OBJECTS_CLASSIC_API,         /* object API */
    OBJECTS_RTEMS_SEMAPHORES,    /* object class */
    maximum_semaphores,          /* maximum objects of this class */
    sizeof( Semaphore_Control ), /* size of this object's control block */
    FALSE,                       /* TRUE if the name is a string */
    RTEMS_MAXIMUM_NAME_LENGTH    /* maximum length of an object name */
#if defined(RTEMS_MULTIPROCESSING)
    ,
    TRUE,                        /* TRUE if this is a global object class */
    _Semaphore_MP_Send_extract_proxy /* Proxy extraction support callout */
#endif
  );
 
  /*
   *  Register the MP Process Packet routine.
   */
 
#if defined(RTEMS_MULTIPROCESSING)
  _MPCI_Register_packet_processor(
    MP_PACKET_SEMAPHORE,
    _Semaphore_MP_Process_packet
  );
#endif

}