rtems/src/scheduleridentbyprocessorset.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSImplClassicScheduler
0007  *
0008  * @brief This source file contains the implementation of
0009  *   rtems_scheduler_ident_by_processor_set().
0010  */
0011
0012 /*
0013  * Copyright (c) 2017 embedded brains GmbH & Co. KG
0014  *
0015  * Redistribution and use in source and binary forms, with or without
0016  * modification, are permitted provided that the following conditions
0017  * are met:
0018  * 1. Redistributions of source code must retain the above copyright
0019  *    notice, this list of conditions and the following disclaimer.
0020  * 2. Redistributions in binary form must reproduce the above copyright
0021  *    notice, this list of conditions and the following disclaimer in the
0022  *    documentation and/or other materials provided with the distribution.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #ifdef HAVE_CONFIG_H
0038 #include "config.h"
0039 #endif
0040
0041 #include <rtems/rtems/scheduler.h>
0042 #include <rtems/score/assert.h>
0043 #include <rtems/score/schedulerimpl.h>
0044
0045 rtems_status_code rtems_scheduler_ident_by_processor_set(
0046   size_t           cpusetsize,
0047   const cpu_set_t *cpuset,
0048   rtems_id        *id
0049 )
0050 {
0051   Processor_mask              set;
0052   Processor_mask_Copy_status  status;
0053   uint32_t                    cpu_index;
0054   const Scheduler_Control    *scheduler;
0055
0056   if ( id == NULL ) {
0057     return RTEMS_INVALID_ADDRESS;
0058   }
0059
0060   if ( cpuset == NULL ) {
0061     return RTEMS_INVALID_ADDRESS;
0062   }
0063
0064   status = _Processor_mask_From_cpu_set_t( &set, cpusetsize, cpuset );
0065   if ( status == PROCESSOR_MASK_COPY_INVALID_SIZE ) {
0066     return RTEMS_INVALID_SIZE;
0067   }
0068
0069   _Processor_mask_And( &set, &set, _SMP_Get_online_processors() );
0070   cpu_index = _Processor_mask_Find_last_set( &set );
0071   if ( cpu_index == 0 ) {
0072     return RTEMS_INVALID_NAME;
0073   }
0074
0075   scheduler = _Scheduler_Get_by_CPU( _Per_CPU_Get_by_index( cpu_index - 1) );
0076 #if defined(RTEMS_SMP)
0077   if ( scheduler == NULL ) {
0078     return RTEMS_INCORRECT_STATE;
0079   }
0080 #else
0081   _Assert( scheduler != NULL );
0082 #endif
0083
0084   *id = _Scheduler_Build_id( _Scheduler_Get_index( scheduler ) );
0085   return RTEMS_SUCCESSFUL;
0086 }