score/src/schedulergetaffinity.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSScoreScheduler
0007  *
0008  * @brief This source file contains the implementation of
0009  *   _Scheduler_Get_affinity().
0010  */
0011
0012 /*
0013  * Copyright (C) 2014, 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/score/schedulerimpl.h>
0042
0043 Status_Control _Scheduler_Get_affinity(
0044   Thread_Control *the_thread,
0045   size_t          cpusetsize,
0046   cpu_set_t      *cpuset
0047 )
0048 {
0049   const Scheduler_Control    *scheduler;
0050   ISR_lock_Context            lock_context;
0051   const Processor_mask       *affinity;
0052   Processor_mask_Copy_status  status;
0053
0054   scheduler = _Thread_Scheduler_get_home( the_thread );
0055   _Scheduler_Acquire_critical( scheduler, &lock_context );
0056
0057 #if defined(RTEMS_SMP)
0058   affinity = &the_thread->Scheduler.Affinity;
0059 #else
0060   affinity = &_Processor_mask_The_one_and_only;
0061 #endif
0062   status = _Processor_mask_To_cpu_set_t( affinity, cpusetsize, cpuset );
0063
0064   _Scheduler_Release_critical( scheduler, &lock_context );
0065
0066   if ( status != PROCESSOR_MASK_COPY_LOSSLESS ) {
0067     return STATUS_INVALID_SIZE;
0068   }
0069
0070   return STATUS_SUCCESSFUL;
0071 }