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 RTEMSScoreSchedulerSMP |
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7 | * |
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8 | * @brief This header file provides interfaces of the |
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9 | * @ref RTEMSScoreSchedulerSMP which are used by the implementation and the |
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10 | * @ref RTEMSImplApplConfig. |
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11 | */ |
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12 | |
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13 | /* |
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14 | * Copyright (c) 2013-2014 embedded brains GmbH. All rights reserved. |
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15 | * |
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16 | * Redistribution and use in source and binary forms, with or without |
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17 | * modification, are permitted provided that the following conditions |
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18 | * are met: |
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19 | * 1. Redistributions of source code must retain the above copyright |
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20 | * notice, this list of conditions and the following disclaimer. |
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21 | * 2. Redistributions in binary form must reproduce the above copyright |
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22 | * notice, this list of conditions and the following disclaimer in the |
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23 | * documentation and/or other materials provided with the distribution. |
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24 | * |
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25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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26 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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29 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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35 | * POSSIBILITY OF SUCH DAMAGE. |
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36 | */ |
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37 | |
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38 | #ifndef _RTEMS_SCORE_SCHEDULERSMP_H |
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39 | #define _RTEMS_SCORE_SCHEDULERSMP_H |
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40 | |
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41 | #include <rtems/score/chain.h> |
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42 | #include <rtems/score/scheduler.h> |
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43 | |
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44 | #ifdef __cplusplus |
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45 | extern "C" { |
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46 | #endif /* __cplusplus */ |
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47 | |
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48 | /** |
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49 | * @defgroup RTEMSScoreSchedulerSMP SMP Scheduler |
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50 | * |
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51 | * @ingroup RTEMSScoreScheduler |
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52 | * |
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53 | * @brief This group contains the SMP Scheduler implementation. |
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54 | * |
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55 | * @{ |
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56 | */ |
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57 | |
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58 | /** |
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59 | * @brief Scheduler context specialization for SMP schedulers. |
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60 | */ |
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61 | typedef struct { |
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62 | /** |
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63 | * @brief Basic scheduler context. |
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64 | */ |
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65 | Scheduler_Context Base; |
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66 | |
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67 | /** |
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68 | * @brief The chain of scheduled nodes. |
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69 | */ |
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70 | Chain_Control Scheduled; |
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71 | } Scheduler_SMP_Context; |
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72 | |
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73 | /** |
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74 | * @brief SMP scheduler node states. |
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75 | */ |
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76 | typedef enum { |
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77 | /** |
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78 | * @brief This scheduler node is blocked. |
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79 | * |
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80 | * A scheduler node is blocked if the corresponding thread is not ready. |
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81 | */ |
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82 | SCHEDULER_SMP_NODE_BLOCKED, |
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83 | |
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84 | /** |
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85 | * @brief The scheduler node is scheduled. |
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86 | * |
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87 | * A scheduler node is scheduled if the corresponding thread is ready and the |
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88 | * scheduler allocated a processor for it. A scheduled node is assigned to |
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89 | * exactly one processor. The count of scheduled nodes in this scheduler |
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90 | * instance equals the processor count owned by the scheduler instance. |
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91 | */ |
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92 | SCHEDULER_SMP_NODE_SCHEDULED, |
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93 | |
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94 | /** |
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95 | * @brief This scheduler node is ready. |
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96 | * |
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97 | * A scheduler node is ready if the corresponding thread is ready and the |
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98 | * scheduler did not allocate a processor for it. |
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99 | */ |
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100 | SCHEDULER_SMP_NODE_READY |
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101 | } Scheduler_SMP_Node_state; |
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102 | |
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103 | /** |
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104 | * @brief Scheduler node specialization for SMP schedulers. |
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105 | */ |
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106 | typedef struct { |
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107 | /** |
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108 | * @brief Basic scheduler node. |
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109 | */ |
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110 | Scheduler_Node Base; |
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111 | |
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112 | /** |
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113 | * @brief The state of this node. |
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114 | */ |
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115 | Scheduler_SMP_Node_state state; |
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116 | |
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117 | /** |
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118 | * @brief The current priority of thread owning this node. |
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119 | */ |
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120 | Priority_Control priority; |
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121 | } Scheduler_SMP_Node; |
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122 | |
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123 | /** |
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124 | * @brief Starts an idle thread on the specified cpu. |
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125 | * |
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126 | * @param scheduler The scheduler instance. |
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127 | * @param[in, out] idle The idle thread to schedule. |
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128 | * @param[out] cpu The cpu to run the idle thread on. |
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129 | */ |
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130 | void _Scheduler_SMP_Start_idle( |
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131 | const Scheduler_Control *scheduler, |
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132 | Thread_Control *idle, |
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133 | struct Per_CPU_Control *cpu |
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134 | ); |
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135 | |
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136 | /** @} */ |
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137 | |
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138 | #ifdef __cplusplus |
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139 | } |
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140 | #endif /* __cplusplus */ |
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141 | |
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142 | #endif /* _RTEMS_SCORE_SCHEDULERSMP_H */ |
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