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