1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @ingroup RTEMSImplClassicTask |
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7 | * |
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8 | * @brief This source file contains the implementation of |
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9 | * rtems_task_set_scheduler(). |
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10 | */ |
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11 | |
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12 | /* |
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13 | * Copyright (c) 2014 embedded brains GmbH. All rights reserved. |
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14 | * |
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15 | * embedded brains GmbH |
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16 | * Dornierstr. 4 |
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17 | * 82178 Puchheim |
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18 | * Germany |
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19 | * <rtems@embedded-brains.de> |
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20 | * |
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21 | * Redistribution and use in source and binary forms, with or without |
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22 | * modification, are permitted provided that the following conditions |
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23 | * are met: |
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24 | * 1. Redistributions of source code must retain the above copyright |
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25 | * notice, this list of conditions and the following disclaimer. |
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26 | * 2. Redistributions in binary form must reproduce the above copyright |
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27 | * notice, this list of conditions and the following disclaimer in the |
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28 | * documentation and/or other materials provided with the distribution. |
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29 | * |
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30 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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31 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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32 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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33 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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34 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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35 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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36 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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37 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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38 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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39 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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40 | * POSSIBILITY OF SUCH DAMAGE. |
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41 | */ |
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42 | |
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43 | #ifdef HAVE_CONFIG_H |
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44 | #include "config.h" |
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45 | #endif |
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46 | |
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47 | #include <rtems/rtems/tasksimpl.h> |
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48 | #include <rtems/rtems/statusimpl.h> |
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49 | #include <rtems/score/schedulerimpl.h> |
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50 | |
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51 | rtems_status_code rtems_task_set_scheduler( |
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52 | rtems_id task_id, |
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53 | rtems_id scheduler_id, |
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54 | rtems_task_priority priority |
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55 | ) |
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56 | { |
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57 | const Scheduler_Control *scheduler; |
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58 | Thread_Control *the_thread; |
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59 | Thread_queue_Context queue_context; |
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60 | ISR_lock_Context state_context; |
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61 | Per_CPU_Control *cpu_self; |
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62 | bool valid; |
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63 | Priority_Control core_priority; |
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64 | Status_Control status; |
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65 | |
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66 | scheduler = _Scheduler_Get_by_id( scheduler_id ); |
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67 | if ( scheduler == NULL ) { |
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68 | return RTEMS_INVALID_ID; |
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69 | } |
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70 | |
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71 | core_priority = _RTEMS_Priority_To_core( scheduler, priority, &valid ); |
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72 | if ( !valid ) { |
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73 | return RTEMS_INVALID_PRIORITY; |
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74 | } |
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75 | |
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76 | _Thread_queue_Context_initialize( &queue_context ); |
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77 | the_thread = _Thread_Get( task_id, &queue_context.Lock_context.Lock_context ); |
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78 | |
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79 | if ( the_thread == NULL ) { |
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80 | #if defined(RTEMS_MULTIPROCESSING) |
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81 | if ( _Thread_MP_Is_remote( task_id ) ) { |
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82 | return RTEMS_ILLEGAL_ON_REMOTE_OBJECT; |
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83 | } |
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84 | #endif |
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85 | |
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86 | return RTEMS_INVALID_ID; |
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87 | } |
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88 | |
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89 | cpu_self = _Thread_queue_Dispatch_disable( &queue_context ); |
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90 | _Thread_Wait_acquire_critical( the_thread, &queue_context ); |
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91 | _Thread_State_acquire_critical( the_thread, &state_context ); |
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92 | |
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93 | status = _Scheduler_Set( scheduler, the_thread, core_priority ); |
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94 | |
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95 | _Thread_State_release_critical( the_thread, &state_context ); |
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96 | _Thread_Wait_release( the_thread, &queue_context ); |
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97 | _Thread_Dispatch_enable( cpu_self ); |
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98 | return _Status_Get( status ); |
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99 | } |
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