1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Simple SMP Scheduler API |
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5 | * |
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6 | * @ingroup ScoreSchedulerSMPSimple |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * Copyright (c) 2013 embedded brains GmbH. |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #ifndef _RTEMS_SCORE_SCHEDULERSIMPLE_SMP_H |
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20 | #define _RTEMS_SCORE_SCHEDULERSIMPLE_SMP_H |
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21 | |
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22 | #ifdef __cplusplus |
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23 | extern "C" { |
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24 | #endif |
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25 | |
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26 | #include <rtems/score/scheduler.h> |
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27 | #include <rtems/score/schedulerpriority.h> |
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28 | #include <rtems/score/schedulersmp.h> |
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29 | |
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30 | /** |
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31 | * @defgroup ScoreSchedulerSMPSimple Simple Priority SMP Scheduler |
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32 | * |
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33 | * @ingroup ScoreSchedulerSMP |
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34 | * |
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35 | * The Simple Priority SMP Scheduler allocates a processor for the processor |
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36 | * count highest priority ready threads. The thread priority and position in |
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37 | * the ready chain are the only information to determine the scheduling |
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38 | * decision. Threads with an allocated processor are in the scheduled chain. |
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39 | * After initialization the scheduled chain has exactly processor count nodes. |
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40 | * Each processor has exactly one allocated thread after initialization. All |
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41 | * enqueue and extract operations may exchange threads with the scheduled |
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42 | * chain. One thread will be added and another will be removed. The scheduled |
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43 | * and ready chain is ordered according to the thread priority order. The |
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44 | * chain insert operations are O(count of ready threads), thus this scheduler |
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45 | * is unsuitable for most real-time applications. |
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46 | * |
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47 | * The thread preempt mode will be ignored. |
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48 | * |
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49 | * @{ |
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50 | */ |
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51 | |
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52 | typedef struct { |
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53 | Scheduler_SMP_Context Base; |
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54 | Chain_Control Ready; |
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55 | } Scheduler_simple_SMP_Context; |
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56 | |
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57 | #define SCHEDULER_SIMPLE_SMP_MAXIMUM_PRIORITY 255 |
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58 | |
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59 | /** |
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60 | * @brief Entry points for the Simple SMP Scheduler. |
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61 | */ |
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62 | #define SCHEDULER_SIMPLE_SMP_ENTRY_POINTS \ |
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63 | { \ |
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64 | _Scheduler_simple_SMP_Initialize, \ |
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65 | _Scheduler_default_Schedule, \ |
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66 | _Scheduler_simple_SMP_Yield, \ |
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67 | _Scheduler_simple_SMP_Block, \ |
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68 | _Scheduler_simple_SMP_Unblock, \ |
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69 | _Scheduler_simple_SMP_Update_priority, \ |
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70 | _Scheduler_default_Map_priority, \ |
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71 | _Scheduler_default_Unmap_priority, \ |
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72 | _Scheduler_simple_SMP_Ask_for_help, \ |
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73 | _Scheduler_simple_SMP_Node_initialize, \ |
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74 | _Scheduler_default_Node_destroy, \ |
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75 | _Scheduler_default_Release_job, \ |
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76 | _Scheduler_default_Cancel_job, \ |
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77 | _Scheduler_default_Tick, \ |
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78 | _Scheduler_SMP_Start_idle \ |
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79 | SCHEDULER_OPERATION_DEFAULT_GET_SET_AFFINITY \ |
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80 | } |
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81 | |
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82 | void _Scheduler_simple_SMP_Initialize( const Scheduler_Control *scheduler ); |
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83 | |
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84 | void _Scheduler_simple_SMP_Node_initialize( |
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85 | const Scheduler_Control *scheduler, |
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86 | Scheduler_Node *node, |
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87 | Thread_Control *the_thread, |
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88 | Priority_Control priority |
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89 | ); |
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90 | |
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91 | void _Scheduler_simple_SMP_Block( |
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92 | const Scheduler_Control *scheduler, |
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93 | Thread_Control *thread |
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94 | ); |
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95 | |
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96 | Thread_Control *_Scheduler_simple_SMP_Unblock( |
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97 | const Scheduler_Control *scheduler, |
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98 | Thread_Control *thread |
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99 | ); |
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100 | |
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101 | Thread_Control *_Scheduler_simple_SMP_Update_priority( |
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102 | const Scheduler_Control *scheduler, |
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103 | Thread_Control *the_thread |
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104 | ); |
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105 | |
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106 | Thread_Control *_Scheduler_simple_SMP_Ask_for_help( |
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107 | const Scheduler_Control *scheduler, |
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108 | Thread_Control *offers_help, |
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109 | Thread_Control *needs_help |
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110 | ); |
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111 | |
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112 | Thread_Control *_Scheduler_simple_SMP_Yield( |
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113 | const Scheduler_Control *scheduler, |
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114 | Thread_Control *thread |
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115 | ); |
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116 | |
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117 | /** @} */ |
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118 | |
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119 | #ifdef __cplusplus |
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120 | } |
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121 | #endif |
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122 | |
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123 | #endif |
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124 | /* end of include file */ |
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