score/src/objectgetinfo.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSScoreObject
0007  *
0008  * @brief This source file contains the implementation of
0009  *   _Objects_Get_information().
0010  */
0011
0012 /*
0013  *  COPYRIGHT (c) 1989-2008.
0014  *  On-Line Applications Research Corporation (OAR).
0015  *
0016  * Redistribution and use in source and binary forms, with or without
0017  * modification, are permitted provided that the following conditions
0018  * are met:
0019  * 1. Redistributions of source code must retain the above copyright
0020  *    notice, this list of conditions and the following disclaimer.
0021  * 2. Redistributions in binary form must reproduce the above copyright
0022  *    notice, this list of conditions and the following disclaimer in the
0023  *    documentation and/or other materials provided with the distribution.
0024  *
0025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0028  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0029  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0030  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0031  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0032  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0033  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0034  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0035  * POSSIBILITY OF SUCH DAMAGE.
0036  */
0037
0038 #ifdef HAVE_CONFIG_H
0039 #include "config.h"
0040 #endif
0041
0042 #include <rtems/score/objectimpl.h>
0043
0044 Objects_Information *_Objects_Get_information(
0045   Objects_APIs   the_api,
0046   uint16_t       the_class
0047 )
0048 {
0049   Objects_Information *info;
0050   int the_class_api_maximum;
0051
0052   if ( !the_class )
0053     return NULL;
0054
0055   /*
0056    *  This call implicitly validates the_api so we do not call
0057    *  _Objects_Is_api_valid above here.
0058    */
0059   the_class_api_maximum = _Objects_API_maximum_class( the_api );
0060   if ( the_class_api_maximum == 0 )
0061     return NULL;
0062
0063   if ( the_class > (uint32_t) the_class_api_maximum )
0064     return NULL;
0065
0066   if ( !_Objects_Information_table[ the_api ] )
0067     return NULL;
0068
0069   info = _Objects_Information_table[ the_api ][ the_class ];
0070   if ( !info )
0071     return NULL;
0072
0073   /*
0074    * In a multiprocessing configuration, we may access remote objects.
0075    * Thus we may have 0 local instances and still have a valid object
0076    * pointer.
0077    */
0078 #if !defined(RTEMS_MULTIPROCESSING)
0079   if ( _Objects_Get_maximum_index( info ) == 0 ) {
0080     return NULL;
0081   }
0082 #endif
0083
0084   return info;
0085 }
0086