rtems/src/taskgetscheduler.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSImplClassicTask
0007  *
0008  * @brief This source file contains the implementation of
0009  *   rtems_task_get_scheduler().
0010  */
0011
0012 /*
0013  * Copyright (c) 2014 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/tasks.h>
0042 #include <rtems/score/schedulerimpl.h>
0043
0044 rtems_status_code rtems_task_get_scheduler(
0045   rtems_id  task_id,
0046   rtems_id *scheduler_id
0047 )
0048 {
0049   Thread_Control          *the_thread;
0050   ISR_lock_Context         lock_context;
0051   const Scheduler_Control *scheduler;
0052
0053   if ( scheduler_id == NULL ) {
0054     return RTEMS_INVALID_ADDRESS;
0055   }
0056
0057   the_thread = _Thread_Get( task_id, &lock_context );
0058
0059   if ( the_thread == NULL ) {
0060 #if defined(RTEMS_MULTIPROCESSING)
0061     if ( _Thread_MP_Is_remote( task_id ) ) {
0062       return RTEMS_ILLEGAL_ON_REMOTE_OBJECT;
0063     }
0064 #endif
0065
0066     return RTEMS_INVALID_ID;
0067   }
0068
0069   _Thread_State_acquire_critical( the_thread, &lock_context );
0070
0071   scheduler = _Thread_Scheduler_get_home( the_thread );
0072   *scheduler_id = _Scheduler_Build_id( _Scheduler_Get_index( scheduler ) );
0073
0074   _Thread_State_release( the_thread, &lock_context );
0075   return RTEMS_SUCCESSFUL;
0076 }