[1f0d013] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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[11e7893] | 4 | * @ingroup RTEMSScoreScheduler |
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| 5 | * |
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[1f0d013] | 6 | * @brief Inlined Routines Associated with the Manipulation of the Scheduler |
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[0faa9dad] | 7 | * |
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[1f0d013] | 8 | * This inline file contains all of the inlined routines associated with |
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| 9 | * the manipulation of the scheduler. |
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[0faa9dad] | 10 | */ |
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| 11 | |
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| 12 | /* |
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| 13 | * Copyright (C) 2010 Gedare Bloom. |
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[010192d] | 14 | * Copyright (C) 2011 On-Line Applications Research Corporation (OAR). |
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[088acbb0] | 15 | * Copyright (c) 2014, 2017 embedded brains GmbH |
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[0faa9dad] | 16 | * |
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| 17 | * The license and distribution terms for this file may be |
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| 18 | * found in the file LICENSE in this distribution or at |
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[c499856] | 19 | * http://www.rtems.org/license/LICENSE. |
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[0faa9dad] | 20 | */ |
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| 21 | |
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[c6e21ee1] | 22 | #ifndef _RTEMS_SCORE_SCHEDULERIMPL_H |
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| 23 | #define _RTEMS_SCORE_SCHEDULERIMPL_H |
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| 24 | |
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| 25 | #include <rtems/score/scheduler.h> |
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[a7a8ec03] | 26 | #include <rtems/score/assert.h> |
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[300f6a48] | 27 | #include <rtems/score/priorityimpl.h> |
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[c5831a3f] | 28 | #include <rtems/score/smpimpl.h> |
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[c0bd006] | 29 | #include <rtems/score/status.h> |
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[e5ca54c9] | 30 | #include <rtems/score/threadimpl.h> |
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[0faa9dad] | 31 | |
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[c6e21ee1] | 32 | #ifdef __cplusplus |
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| 33 | extern "C" { |
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| 34 | #endif |
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[0faa9dad] | 35 | |
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| 36 | /** |
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[4c20da4b] | 37 | * @addtogroup RTEMSScoreScheduler |
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[11e7893] | 38 | * |
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| 39 | * @{ |
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[0faa9dad] | 40 | */ |
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| 41 | |
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[c597fb1] | 42 | /** |
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| 43 | * @brief Maps a priority value to support the append indicator. |
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| 44 | */ |
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| 45 | #define SCHEDULER_PRIORITY_MAP( priority ) ( ( priority ) << 1 ) |
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| 46 | |
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| 47 | /** |
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| 48 | * @brief Returns the plain priority value. |
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| 49 | */ |
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| 50 | #define SCHEDULER_PRIORITY_UNMAP( priority ) ( ( priority ) >> 1 ) |
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| 51 | |
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| 52 | /** |
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| 53 | * @brief Clears the priority append indicator bit. |
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| 54 | */ |
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| 55 | #define SCHEDULER_PRIORITY_PURIFY( priority ) \ |
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| 56 | ( ( priority ) & ~( (Priority_Control) SCHEDULER_PRIORITY_APPEND_FLAG ) ) |
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| 57 | |
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| 58 | /** |
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| 59 | * @brief Returns the priority control with the append indicator bit set. |
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| 60 | */ |
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| 61 | #define SCHEDULER_PRIORITY_APPEND( priority ) \ |
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| 62 | ( ( priority ) | SCHEDULER_PRIORITY_APPEND_FLAG ) |
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| 63 | |
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| 64 | /** |
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| 65 | * @brief Returns true, if the item should be appended to its priority group, |
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| 66 | * otherwise returns false and the item should be prepended to its priority |
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| 67 | * group. |
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| 68 | */ |
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| 69 | #define SCHEDULER_PRIORITY_IS_APPEND( priority ) \ |
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| 70 | ( ( ( priority ) & SCHEDULER_PRIORITY_APPEND_FLAG ) != 0 ) |
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| 71 | |
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[c6e21ee1] | 72 | /** |
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[11e7893] | 73 | * @brief Initializes the scheduler to the policy chosen by the user. |
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[c6e21ee1] | 74 | * |
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[11e7893] | 75 | * This routine initializes the scheduler to the policy chosen by the user |
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| 76 | * through confdefs, or to the priority scheduler with ready chains by |
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| 77 | * default. |
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[c6e21ee1] | 78 | */ |
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| 79 | void _Scheduler_Handler_initialization( void ); |
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| 80 | |
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[11e7893] | 81 | /** |
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| 82 | * @brief Gets the context of the scheduler. |
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| 83 | * |
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| 84 | * @param scheduler The scheduler to get the context of. |
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| 85 | * |
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| 86 | * @return The context of @a scheduler. |
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| 87 | */ |
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[5c3d250] | 88 | RTEMS_INLINE_ROUTINE Scheduler_Context *_Scheduler_Get_context( |
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| 89 | const Scheduler_Control *scheduler |
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| 90 | ) |
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| 91 | { |
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| 92 | return scheduler->context; |
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| 93 | } |
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| 94 | |
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[11e7893] | 95 | /** |
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| 96 | * @brief Gets the scheduler for the cpu. |
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| 97 | * |
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| 98 | * @param cpu The cpu control to get the scheduler of. |
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| 99 | * |
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| 100 | * @return The scheduler for the cpu. |
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| 101 | */ |
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[1c46b80] | 102 | RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get_by_CPU( |
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| 103 | const Per_CPU_Control *cpu |
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[c5831a3f] | 104 | ) |
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| 105 | { |
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| 106 | #if defined(RTEMS_SMP) |
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[1c46b80] | 107 | return cpu->Scheduler.control; |
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[c5831a3f] | 108 | #else |
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[1c46b80] | 109 | (void) cpu; |
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[c5831a3f] | 110 | return &_Scheduler_Table[ 0 ]; |
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| 111 | #endif |
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| 112 | } |
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| 113 | |
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[bd12dda] | 114 | /** |
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| 115 | * @brief Acquires the scheduler instance inside a critical section (interrupts |
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| 116 | * disabled). |
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| 117 | * |
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[11e7893] | 118 | * @param scheduler The scheduler instance. |
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| 119 | * @param lock_context The lock context to use for |
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[bd12dda] | 120 | * _Scheduler_Release_critical(). |
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| 121 | */ |
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| 122 | RTEMS_INLINE_ROUTINE void _Scheduler_Acquire_critical( |
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| 123 | const Scheduler_Control *scheduler, |
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| 124 | ISR_lock_Context *lock_context |
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| 125 | ) |
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| 126 | { |
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[913864c] | 127 | #if defined(RTEMS_SMP) |
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| 128 | Scheduler_Context *context; |
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| 129 | |
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| 130 | context = _Scheduler_Get_context( scheduler ); |
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| 131 | _ISR_lock_Acquire( &context->Lock, lock_context ); |
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| 132 | #else |
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[bd12dda] | 133 | (void) scheduler; |
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[913864c] | 134 | (void) lock_context; |
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| 135 | #endif |
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[bd12dda] | 136 | } |
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| 137 | |
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| 138 | /** |
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| 139 | * @brief Releases the scheduler instance inside a critical section (interrupts |
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| 140 | * disabled). |
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| 141 | * |
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[11e7893] | 142 | * @param scheduler The scheduler instance. |
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| 143 | * @param lock_context The lock context used for |
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[bd12dda] | 144 | * _Scheduler_Acquire_critical(). |
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| 145 | */ |
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| 146 | RTEMS_INLINE_ROUTINE void _Scheduler_Release_critical( |
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| 147 | const Scheduler_Control *scheduler, |
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| 148 | ISR_lock_Context *lock_context |
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| 149 | ) |
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| 150 | { |
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[913864c] | 151 | #if defined(RTEMS_SMP) |
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| 152 | Scheduler_Context *context; |
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| 153 | |
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| 154 | context = _Scheduler_Get_context( scheduler ); |
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| 155 | _ISR_lock_Release( &context->Lock, lock_context ); |
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| 156 | #else |
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[bd12dda] | 157 | (void) scheduler; |
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[913864c] | 158 | (void) lock_context; |
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| 159 | #endif |
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[bd12dda] | 160 | } |
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| 161 | |
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[ca1e546e] | 162 | #if defined(RTEMS_SMP) |
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[088acbb0] | 163 | void _Scheduler_Request_ask_for_help( Thread_Control *the_thread ); |
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| 164 | |
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[ca1e546e] | 165 | /** |
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[088acbb0] | 166 | * @brief Registers an ask for help request if necessary. |
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[ca1e546e] | 167 | * |
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| 168 | * The actual ask for help operation is carried out during |
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| 169 | * _Thread_Do_dispatch() on a processor related to the thread. This yields a |
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| 170 | * better separation of scheduler instances. A thread of one scheduler |
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| 171 | * instance should not be forced to carry out too much work for threads on |
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| 172 | * other scheduler instances. |
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| 173 | * |
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[11e7893] | 174 | * @param the_thread The thread in need for help. |
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[ca1e546e] | 175 | */ |
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| 176 | RTEMS_INLINE_ROUTINE void _Scheduler_Ask_for_help( Thread_Control *the_thread ) |
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| 177 | { |
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| 178 | _Assert( _Thread_State_is_owner( the_thread ) ); |
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| 179 | |
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| 180 | if ( the_thread->Scheduler.helping_nodes > 0 ) { |
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[088acbb0] | 181 | _Scheduler_Request_ask_for_help( the_thread ); |
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[ca1e546e] | 182 | } |
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| 183 | } |
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| 184 | #endif |
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| 185 | |
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[0faa9dad] | 186 | /** |
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[1f0d013] | 187 | * The preferred method to add a new scheduler is to define the jump table |
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| 188 | * entries and add a case to the _Scheduler_Initialize routine. |
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[0faa9dad] | 189 | * |
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[1f0d013] | 190 | * Generic scheduling implementations that rely on the ready queue only can |
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[0faa9dad] | 191 | * be found in the _Scheduler_queue_XXX functions. |
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| 192 | */ |
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| 193 | |
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[1f0d013] | 194 | /* |
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| 195 | * Passing the Scheduler_Control* to these functions allows for multiple |
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| 196 | * scheduler's to exist simultaneously, which could be useful on an SMP |
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| 197 | * system. Then remote Schedulers may be accessible. How to protect such |
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[0faa9dad] | 198 | * accesses remains an open problem. |
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| 199 | */ |
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| 200 | |
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[1f0d013] | 201 | /** |
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[92635cb] | 202 | * @brief General scheduling decision. |
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[0faa9dad] | 203 | * |
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[1f0d013] | 204 | * This kernel routine implements the scheduling decision logic for |
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| 205 | * the scheduler. It does NOT dispatch. |
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[e5ca54c9] | 206 | * |
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[11e7893] | 207 | * @param the_thread The thread which state changed previously. |
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[0faa9dad] | 208 | */ |
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[92635cb] | 209 | RTEMS_INLINE_ROUTINE void _Scheduler_Schedule( Thread_Control *the_thread ) |
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[0faa9dad] | 210 | { |
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[bd12dda] | 211 | const Scheduler_Control *scheduler; |
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| 212 | ISR_lock_Context lock_context; |
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| 213 | |
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[2dd098a] | 214 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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[bd12dda] | 215 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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[92635cb] | 216 | |
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[24934e36] | 217 | ( *scheduler->Operations.schedule )( scheduler, the_thread ); |
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[bd12dda] | 218 | |
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| 219 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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[0faa9dad] | 220 | } |
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| 221 | |
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[1f0d013] | 222 | /** |
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[6eba7c85] | 223 | * @brief Scheduler yield with a particular thread. |
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[0faa9dad] | 224 | * |
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[6eba7c85] | 225 | * This routine is invoked when a thread wishes to voluntarily transfer control |
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| 226 | * of the processor to another thread. |
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| 227 | * |
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[11e7893] | 228 | * @param the_thread The yielding thread. |
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[0faa9dad] | 229 | */ |
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[92635cb] | 230 | RTEMS_INLINE_ROUTINE void _Scheduler_Yield( Thread_Control *the_thread ) |
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[0faa9dad] | 231 | { |
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[bd12dda] | 232 | const Scheduler_Control *scheduler; |
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| 233 | ISR_lock_Context lock_context; |
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[6a82f1ae] | 234 | |
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[2dd098a] | 235 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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[ca1e546e] | 236 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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[2df4abc] | 237 | ( *scheduler->Operations.yield )( |
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| 238 | scheduler, |
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| 239 | the_thread, |
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| 240 | _Thread_Scheduler_get_home_node( the_thread ) |
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| 241 | ); |
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[ca1e546e] | 242 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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[0faa9dad] | 243 | } |
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| 244 | |
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[1f0d013] | 245 | /** |
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[92635cb] | 246 | * @brief Blocks a thread with respect to the scheduler. |
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[0faa9dad] | 247 | * |
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[1f0d013] | 248 | * This routine removes @a the_thread from the scheduling decision for |
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| 249 | * the scheduler. The primary task is to remove the thread from the |
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[11e7893] | 250 | * ready queue. It performs any necessary scheduling operations |
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[1f0d013] | 251 | * including the selection of a new heir thread. |
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[92635cb] | 252 | * |
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[11e7893] | 253 | * @param the_thread The thread. |
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[0faa9dad] | 254 | */ |
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[92635cb] | 255 | RTEMS_INLINE_ROUTINE void _Scheduler_Block( Thread_Control *the_thread ) |
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[0faa9dad] | 256 | { |
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[351c14d] | 257 | #if defined(RTEMS_SMP) |
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| 258 | Chain_Node *node; |
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| 259 | const Chain_Node *tail; |
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| 260 | Scheduler_Node *scheduler_node; |
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[bd12dda] | 261 | const Scheduler_Control *scheduler; |
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| 262 | ISR_lock_Context lock_context; |
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| 263 | |
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[351c14d] | 264 | node = _Chain_First( &the_thread->Scheduler.Scheduler_nodes ); |
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| 265 | tail = _Chain_Immutable_tail( &the_thread->Scheduler.Scheduler_nodes ); |
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| 266 | |
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| 267 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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| 268 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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| 269 | |
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[bd12dda] | 270 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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[351c14d] | 271 | ( *scheduler->Operations.block )( |
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| 272 | scheduler, |
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| 273 | the_thread, |
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| 274 | scheduler_node |
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| 275 | ); |
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| 276 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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| 277 | |
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| 278 | node = _Chain_Next( node ); |
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| 279 | |
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| 280 | while ( node != tail ) { |
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| 281 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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| 282 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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[92635cb] | 283 | |
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[351c14d] | 284 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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| 285 | ( *scheduler->Operations.withdraw_node )( |
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| 286 | scheduler, |
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| 287 | the_thread, |
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| 288 | scheduler_node, |
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| 289 | THREAD_SCHEDULER_BLOCKED |
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| 290 | ); |
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| 291 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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| 292 | |
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| 293 | node = _Chain_Next( node ); |
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| 294 | } |
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| 295 | #else |
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| 296 | const Scheduler_Control *scheduler; |
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| 297 | |
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[2dd098a] | 298 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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[e382a1b] | 299 | ( *scheduler->Operations.block )( |
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| 300 | scheduler, |
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| 301 | the_thread, |
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| 302 | _Thread_Scheduler_get_home_node( the_thread ) |
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| 303 | ); |
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[351c14d] | 304 | #endif |
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[0faa9dad] | 305 | } |
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| 306 | |
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[1f0d013] | 307 | /** |
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[92635cb] | 308 | * @brief Unblocks a thread with respect to the scheduler. |
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[0faa9dad] | 309 | * |
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[9bfad8c] | 310 | * This operation must fetch the latest thread priority value for this |
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| 311 | * scheduler instance and update its internal state if necessary. |
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[92635cb] | 312 | * |
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[11e7893] | 313 | * @param the_thread The thread. |
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[9bfad8c] | 314 | * |
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| 315 | * @see _Scheduler_Node_get_priority(). |
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[0faa9dad] | 316 | */ |
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[92635cb] | 317 | RTEMS_INLINE_ROUTINE void _Scheduler_Unblock( Thread_Control *the_thread ) |
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[0faa9dad] | 318 | { |
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[d8bc0730] | 319 | Scheduler_Node *scheduler_node; |
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[bd12dda] | 320 | const Scheduler_Control *scheduler; |
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| 321 | ISR_lock_Context lock_context; |
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[351c14d] | 322 | |
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[d8bc0730] | 323 | #if defined(RTEMS_SMP) |
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| 324 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( |
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| 325 | _Chain_First( &the_thread->Scheduler.Scheduler_nodes ) |
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| 326 | ); |
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| 327 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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| 328 | #else |
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| 329 | scheduler_node = _Thread_Scheduler_get_home_node( the_thread ); |
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[2dd098a] | 330 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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[d8bc0730] | 331 | #endif |
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| 332 | |
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[ca1e546e] | 333 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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[d8bc0730] | 334 | ( *scheduler->Operations.unblock )( scheduler, the_thread, scheduler_node ); |
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[ca1e546e] | 335 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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[0faa9dad] | 336 | } |
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| 337 | |
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[f39f667a] | 338 | /** |
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| 339 | * @brief Propagates a priority change of a thread to the scheduler. |
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| 340 | * |
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[9bfad8c] | 341 | * On uni-processor configurations, this operation must evaluate the thread |
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| 342 | * state. In case the thread is not ready, then the priority update should be |
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| 343 | * deferred to the next scheduler unblock operation. |
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[f39f667a] | 344 | * |
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[b8a5abf] | 345 | * The operation must update the heir and thread dispatch necessary variables |
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| 346 | * in case the set of scheduled threads changes. |
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| 347 | * |
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[11e7893] | 348 | * @param the_thread The thread changing its priority. |
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[9bfad8c] | 349 | * |
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| 350 | * @see _Scheduler_Node_get_priority(). |
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[f39f667a] | 351 | */ |
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[9bfad8c] | 352 | RTEMS_INLINE_ROUTINE void _Scheduler_Update_priority( Thread_Control *the_thread ) |
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[f39f667a] | 353 | { |
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[8568341] | 354 | #if defined(RTEMS_SMP) |
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[351c14d] | 355 | Chain_Node *node; |
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| 356 | const Chain_Node *tail; |
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[92635cb] | 357 | |
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[2403473] | 358 | _Thread_Scheduler_process_requests( the_thread ); |
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| 359 | |
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[351c14d] | 360 | node = _Chain_First( &the_thread->Scheduler.Scheduler_nodes ); |
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| 361 | tail = _Chain_Immutable_tail( &the_thread->Scheduler.Scheduler_nodes ); |
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[bd12dda] | 362 | |
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[351c14d] | 363 | do { |
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| 364 | Scheduler_Node *scheduler_node; |
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| 365 | const Scheduler_Control *scheduler; |
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| 366 | ISR_lock_Context lock_context; |
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| 367 | |
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| 368 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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| 369 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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| 370 | |
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| 371 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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[97f7dac] | 372 | ( *scheduler->Operations.update_priority )( |
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[351c14d] | 373 | scheduler, |
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| 374 | the_thread, |
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| 375 | scheduler_node |
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| 376 | ); |
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| 377 | _Scheduler_Release_critical( scheduler, &lock_context ); |
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| 378 | |
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| 379 | node = _Chain_Next( node ); |
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| 380 | } while ( node != tail ); |
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| 381 | #else |
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| 382 | const Scheduler_Control *scheduler; |
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| 383 | |
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[2dd098a] | 384 | scheduler = _Thread_Scheduler_get_home( the_thread ); |
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[351c14d] | 385 | ( *scheduler->Operations.update_priority )( |
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| 386 | scheduler, |
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[501043a] | 387 | the_thread, |
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| 388 | _Thread_Scheduler_get_home_node( the_thread ) |
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| 389 | ); |
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[8568341] | 390 | #endif |
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[f39f667a] | 391 | } |
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| 392 | |
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[3a27248] | 393 | #if defined(RTEMS_SMP) |
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| 394 | /** |
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| 395 | * @brief Changes the sticky level of the home scheduler node and propagates a |
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| 396 | * priority change of a thread to the scheduler. |
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| 397 | * |
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[11e7893] | 398 | * @param the_thread The thread changing its priority or sticky level. |
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[3a27248] | 399 | * |
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| 400 | * @see _Scheduler_Update_priority(). |
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| 401 | */ |
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| 402 | RTEMS_INLINE_ROUTINE void _Scheduler_Priority_and_sticky_update( |
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| 403 | Thread_Control *the_thread, |
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| 404 | int sticky_level_change |
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| 405 | ) |
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| 406 | { |
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| 407 | Chain_Node *node; |
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| 408 | const Chain_Node *tail; |
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| 409 | Scheduler_Node *scheduler_node; |
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| 410 | const Scheduler_Control *scheduler; |
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| 411 | ISR_lock_Context lock_context; |
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| 412 | |
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| 413 | _Thread_Scheduler_process_requests( the_thread ); |
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| 414 | |
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| 415 | node = _Chain_First( &the_thread->Scheduler.Scheduler_nodes ); |
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| 416 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
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| 417 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
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| 418 | |
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| 419 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
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| 420 | |
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[6771359f] | 421 | scheduler_node->sticky_level += sticky_level_change; |
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| 422 | _Assert( scheduler_node->sticky_level >= 0 ); |
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| 423 | |
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[3a27248] | 424 | ( *scheduler->Operations.update_priority )( |
---|
| 425 | scheduler, |
---|
| 426 | the_thread, |
---|
| 427 | scheduler_node |
---|
| 428 | ); |
---|
| 429 | |
---|
| 430 | _Scheduler_Release_critical( scheduler, &lock_context ); |
---|
| 431 | |
---|
| 432 | tail = _Chain_Immutable_tail( &the_thread->Scheduler.Scheduler_nodes ); |
---|
| 433 | node = _Chain_Next( node ); |
---|
| 434 | |
---|
| 435 | while ( node != tail ) { |
---|
| 436 | scheduler_node = SCHEDULER_NODE_OF_THREAD_SCHEDULER_NODE( node ); |
---|
| 437 | scheduler = _Scheduler_Node_get_scheduler( scheduler_node ); |
---|
| 438 | |
---|
| 439 | _Scheduler_Acquire_critical( scheduler, &lock_context ); |
---|
| 440 | ( *scheduler->Operations.update_priority )( |
---|
| 441 | scheduler, |
---|
| 442 | the_thread, |
---|
| 443 | scheduler_node |
---|
| 444 | ); |
---|
| 445 | _Scheduler_Release_critical( scheduler, &lock_context ); |
---|
| 446 | |
---|
| 447 | node = _Chain_Next( node ); |
---|
| 448 | } |
---|
| 449 | } |
---|
| 450 | #endif |
---|
| 451 | |
---|
[77ff5599] | 452 | /** |
---|
| 453 | * @brief Maps a thread priority from the user domain to the scheduler domain. |
---|
| 454 | * |
---|
| 455 | * Let M be the maximum scheduler priority. The mapping must be bijective in |
---|
| 456 | * the closed interval [0, M], e.g. _Scheduler_Unmap_priority( scheduler, |
---|
| 457 | * _Scheduler_Map_priority( scheduler, p ) ) == p for all p in [0, M]. For |
---|
| 458 | * other values the mapping is undefined. |
---|
| 459 | * |
---|
[11e7893] | 460 | * @param scheduler The scheduler instance. |
---|
| 461 | * @param priority The user domain thread priority. |
---|
[77ff5599] | 462 | * |
---|
| 463 | * @return The corresponding thread priority of the scheduler domain is returned. |
---|
| 464 | */ |
---|
| 465 | RTEMS_INLINE_ROUTINE Priority_Control _Scheduler_Map_priority( |
---|
| 466 | const Scheduler_Control *scheduler, |
---|
| 467 | Priority_Control priority |
---|
| 468 | ) |
---|
| 469 | { |
---|
| 470 | return ( *scheduler->Operations.map_priority )( scheduler, priority ); |
---|
| 471 | } |
---|
| 472 | |
---|
| 473 | /** |
---|
| 474 | * @brief Unmaps a thread priority from the scheduler domain to the user domain. |
---|
| 475 | * |
---|
[11e7893] | 476 | * @param scheduler The scheduler instance. |
---|
| 477 | * @param priority The scheduler domain thread priority. |
---|
[77ff5599] | 478 | * |
---|
| 479 | * @return The corresponding thread priority of the user domain is returned. |
---|
| 480 | */ |
---|
| 481 | RTEMS_INLINE_ROUTINE Priority_Control _Scheduler_Unmap_priority( |
---|
| 482 | const Scheduler_Control *scheduler, |
---|
| 483 | Priority_Control priority |
---|
| 484 | ) |
---|
| 485 | { |
---|
| 486 | return ( *scheduler->Operations.unmap_priority )( scheduler, priority ); |
---|
| 487 | } |
---|
| 488 | |
---|
[1f0d013] | 489 | /** |
---|
[8e467384] | 490 | * @brief Initializes a scheduler node. |
---|
[0faa9dad] | 491 | * |
---|
[8e467384] | 492 | * The scheduler node contains arbitrary data on function entry. The caller |
---|
| 493 | * must ensure that _Scheduler_Node_destroy() will be called after a |
---|
| 494 | * _Scheduler_Node_initialize() before the memory of the scheduler node is |
---|
| 495 | * destroyed. |
---|
| 496 | * |
---|
[11e7893] | 497 | * @param scheduler The scheduler instance. |
---|
| 498 | * @param[out] node The scheduler node to initialize. |
---|
| 499 | * @param the_thread The thread of the scheduler node to initialize. |
---|
| 500 | * @param priority The thread priority. |
---|
[0faa9dad] | 501 | */ |
---|
[8e467384] | 502 | RTEMS_INLINE_ROUTINE void _Scheduler_Node_initialize( |
---|
[e1598a6] | 503 | const Scheduler_Control *scheduler, |
---|
[df2177ab] | 504 | Scheduler_Node *node, |
---|
[9bfad8c] | 505 | Thread_Control *the_thread, |
---|
| 506 | Priority_Control priority |
---|
[0faa9dad] | 507 | ) |
---|
| 508 | { |
---|
[9bfad8c] | 509 | ( *scheduler->Operations.node_initialize )( |
---|
| 510 | scheduler, |
---|
[df2177ab] | 511 | node, |
---|
[9bfad8c] | 512 | the_thread, |
---|
| 513 | priority |
---|
| 514 | ); |
---|
[0faa9dad] | 515 | } |
---|
| 516 | |
---|
[1f0d013] | 517 | /** |
---|
[8e467384] | 518 | * @brief Destroys a scheduler node. |
---|
[0faa9dad] | 519 | * |
---|
[8e467384] | 520 | * The caller must ensure that _Scheduler_Node_destroy() will be called only |
---|
| 521 | * after a corresponding _Scheduler_Node_initialize(). |
---|
| 522 | * |
---|
[11e7893] | 523 | * @param scheduler The scheduler instance. |
---|
| 524 | * @param[out] node The scheduler node to destroy. |
---|
[0faa9dad] | 525 | */ |
---|
[8e467384] | 526 | RTEMS_INLINE_ROUTINE void _Scheduler_Node_destroy( |
---|
[e1598a6] | 527 | const Scheduler_Control *scheduler, |
---|
[df2177ab] | 528 | Scheduler_Node *node |
---|
[0faa9dad] | 529 | ) |
---|
| 530 | { |
---|
[df2177ab] | 531 | ( *scheduler->Operations.node_destroy )( scheduler, node ); |
---|
[0faa9dad] | 532 | } |
---|
| 533 | |
---|
[ac9d2ecc] | 534 | /** |
---|
[92635cb] | 535 | * @brief Releases a job of a thread with respect to the scheduler. |
---|
[ac9d2ecc] | 536 | * |
---|
[11e7893] | 537 | * @param the_thread The thread. |
---|
| 538 | * @param priority_node The priority node of the job. |
---|
| 539 | * @param deadline The deadline in watchdog ticks since boot. |
---|
| 540 | * @param queue_context The thread queue context to provide the set of |
---|
[300f6a48] | 541 | * threads for _Thread_Priority_update(). |
---|
[ac9d2ecc] | 542 | */ |
---|
[300f6a48] | 543 | RTEMS_INLINE_ROUTINE void _Scheduler_Release_job( |
---|
| 544 | Thread_Control *the_thread, |
---|
| 545 | Priority_Node *priority_node, |
---|
| 546 | uint64_t deadline, |
---|
| 547 | Thread_queue_Context *queue_context |
---|
[ac9d2ecc] | 548 | ) |
---|
| 549 | { |
---|
[2dd098a] | 550 | const Scheduler_Control *scheduler = _Thread_Scheduler_get_home( the_thread ); |
---|
[92635cb] | 551 | |
---|
[300f6a48] | 552 | _Thread_queue_Context_clear_priority_updates( queue_context ); |
---|
| 553 | ( *scheduler->Operations.release_job )( |
---|
[ee0e4135] | 554 | scheduler, |
---|
| 555 | the_thread, |
---|
[300f6a48] | 556 | priority_node, |
---|
| 557 | deadline, |
---|
| 558 | queue_context |
---|
[ee0e4135] | 559 | ); |
---|
[ac9d2ecc] | 560 | } |
---|
| 561 | |
---|
[21bdca4] | 562 | /** |
---|
| 563 | * @brief Cancels a job of a thread with respect to the scheduler. |
---|
| 564 | * |
---|
[11e7893] | 565 | * @param the_thread The thread. |
---|
| 566 | * @param priority_node The priority node of the job. |
---|
| 567 | * @param queue_context The thread queue context to provide the set of |
---|
[300f6a48] | 568 | * threads for _Thread_Priority_update(). |
---|
[21bdca4] | 569 | */ |
---|
[300f6a48] | 570 | RTEMS_INLINE_ROUTINE void _Scheduler_Cancel_job( |
---|
| 571 | Thread_Control *the_thread, |
---|
| 572 | Priority_Node *priority_node, |
---|
| 573 | Thread_queue_Context *queue_context |
---|
[21bdca4] | 574 | ) |
---|
| 575 | { |
---|
[2dd098a] | 576 | const Scheduler_Control *scheduler = _Thread_Scheduler_get_home( the_thread ); |
---|
[21bdca4] | 577 | |
---|
[300f6a48] | 578 | _Thread_queue_Context_clear_priority_updates( queue_context ); |
---|
| 579 | ( *scheduler->Operations.cancel_job )( |
---|
| 580 | scheduler, |
---|
| 581 | the_thread, |
---|
| 582 | priority_node, |
---|
| 583 | queue_context |
---|
| 584 | ); |
---|
[21bdca4] | 585 | } |
---|
| 586 | |
---|
[1f0d013] | 587 | /** |
---|
| 588 | * @brief Scheduler method invoked at each clock tick. |
---|
[3203e09] | 589 | * |
---|
| 590 | * This method is invoked at each clock tick to allow the scheduler |
---|
[1f0d013] | 591 | * implementation to perform any activities required. For the |
---|
[3203e09] | 592 | * scheduler which support standard RTEMS features, this includes |
---|
| 593 | * time-slicing management. |
---|
[11e7893] | 594 | * |
---|
| 595 | * @param cpu The cpu control for the operation. |
---|
[3203e09] | 596 | */ |
---|
[03b900d] | 597 | RTEMS_INLINE_ROUTINE void _Scheduler_Tick( const Per_CPU_Control *cpu ) |
---|
[3203e09] | 598 | { |
---|
[03b900d] | 599 | const Scheduler_Control *scheduler = _Scheduler_Get_by_CPU( cpu ); |
---|
| 600 | Thread_Control *executing = cpu->executing; |
---|
[c5831a3f] | 601 | |
---|
[03b900d] | 602 | if ( scheduler != NULL && executing != NULL ) { |
---|
| 603 | ( *scheduler->Operations.tick )( scheduler, executing ); |
---|
[c5831a3f] | 604 | } |
---|
[3203e09] | 605 | } |
---|
| 606 | |
---|
[1ccb64e1] | 607 | /** |
---|
| 608 | * @brief Starts the idle thread for a particular processor. |
---|
| 609 | * |
---|
[11e7893] | 610 | * @param scheduler The scheduler instance. |
---|
[24934e36] | 611 | * @param[in,out] the_thread The idle thread for the processor. |
---|
[a7e4de2] | 612 | * @param[in,out] cpu The processor for the idle thread. |
---|
[1ccb64e1] | 613 | * |
---|
| 614 | * @see _Thread_Create_idle(). |
---|
| 615 | */ |
---|
| 616 | RTEMS_INLINE_ROUTINE void _Scheduler_Start_idle( |
---|
[e1598a6] | 617 | const Scheduler_Control *scheduler, |
---|
| 618 | Thread_Control *the_thread, |
---|
| 619 | Per_CPU_Control *cpu |
---|
[1ccb64e1] | 620 | ) |
---|
| 621 | { |
---|
[24934e36] | 622 | ( *scheduler->Operations.start_idle )( scheduler, the_thread, cpu ); |
---|
[1ccb64e1] | 623 | } |
---|
| 624 | |
---|
[11e7893] | 625 | /** |
---|
| 626 | * @brief Checks if the scheduler of the cpu with the given index is equal |
---|
| 627 | * to the given scheduler. |
---|
| 628 | * |
---|
| 629 | * @param scheduler The scheduler for the comparison. |
---|
| 630 | * @param cpu_index The index of the cpu for the comparison. |
---|
| 631 | * |
---|
| 632 | * @retval true The scheduler of the cpu is the given @a scheduler. |
---|
| 633 | * @retval false The scheduler of the cpu is not the given @a scheduler. |
---|
| 634 | */ |
---|
[c5831a3f] | 635 | RTEMS_INLINE_ROUTINE bool _Scheduler_Has_processor_ownership( |
---|
| 636 | const Scheduler_Control *scheduler, |
---|
[1c46b80] | 637 | uint32_t cpu_index |
---|
[c5831a3f] | 638 | ) |
---|
| 639 | { |
---|
| 640 | #if defined(RTEMS_SMP) |
---|
[1c46b80] | 641 | const Per_CPU_Control *cpu; |
---|
| 642 | const Scheduler_Control *scheduler_of_cpu; |
---|
| 643 | |
---|
| 644 | cpu = _Per_CPU_Get_by_index( cpu_index ); |
---|
| 645 | scheduler_of_cpu = _Scheduler_Get_by_CPU( cpu ); |
---|
[c5831a3f] | 646 | |
---|
[1c46b80] | 647 | return scheduler_of_cpu == scheduler; |
---|
[c5831a3f] | 648 | #else |
---|
| 649 | (void) scheduler; |
---|
| 650 | (void) cpu_index; |
---|
| 651 | |
---|
| 652 | return true; |
---|
| 653 | #endif |
---|
| 654 | } |
---|
| 655 | |
---|
[11e7893] | 656 | /** |
---|
| 657 | * @brief Gets the processors of the scheduler |
---|
| 658 | * |
---|
| 659 | * @param scheduler The scheduler to get the processors of. |
---|
| 660 | * |
---|
| 661 | * @return The processors of the context of the given scheduler. |
---|
| 662 | */ |
---|
[6b1d8c7] | 663 | RTEMS_INLINE_ROUTINE const Processor_mask *_Scheduler_Get_processors( |
---|
| 664 | const Scheduler_Control *scheduler |
---|
[0712d17] | 665 | ) |
---|
| 666 | { |
---|
[c5831a3f] | 667 | #if defined(RTEMS_SMP) |
---|
[6b1d8c7] | 668 | return &_Scheduler_Get_context( scheduler )->Processors; |
---|
[c5831a3f] | 669 | #else |
---|
[6b1d8c7] | 670 | return &_Processor_mask_The_one_and_only; |
---|
[c5831a3f] | 671 | #endif |
---|
[0712d17] | 672 | } |
---|
| 673 | |
---|
[11e7893] | 674 | /** |
---|
| 675 | * @brief Copies the thread's scheduler's affinity to the given cpuset. |
---|
| 676 | * |
---|
| 677 | * @param the_thread The thread to get the affinity of its scheduler. |
---|
| 678 | * @param cpusetsize The size of @a cpuset. |
---|
| 679 | * @param[out] cpuset The cpuset that serves as destination for the copy operation |
---|
| 680 | * |
---|
| 681 | * @retval true The copy operation was lossless. |
---|
| 682 | * @retval false The copy operation was not lossless |
---|
| 683 | */ |
---|
[0712d17] | 684 | bool _Scheduler_Get_affinity( |
---|
[a92c488] | 685 | Thread_Control *the_thread, |
---|
| 686 | size_t cpusetsize, |
---|
| 687 | cpu_set_t *cpuset |
---|
[0712d17] | 688 | ); |
---|
| 689 | |
---|
[11e7893] | 690 | /** |
---|
| 691 | * @brief Checks if the affinity is a subset of the online processors. |
---|
| 692 | * |
---|
| 693 | * @param scheduler This parameter is unused. |
---|
| 694 | * @param the_thread This parameter is unused. |
---|
| 695 | * @param node This parameter is unused. |
---|
| 696 | * @param affinity The processor mask to check. |
---|
| 697 | * |
---|
| 698 | * @retval true @a affinity is a subset of the online processors. |
---|
| 699 | * @retval false @a affinity is not a subset of the online processors. |
---|
| 700 | */ |
---|
[0712d17] | 701 | RTEMS_INLINE_ROUTINE bool _Scheduler_default_Set_affinity_body( |
---|
| 702 | const Scheduler_Control *scheduler, |
---|
| 703 | Thread_Control *the_thread, |
---|
[197a614] | 704 | Scheduler_Node *node, |
---|
[0232b28] | 705 | const Processor_mask *affinity |
---|
[0712d17] | 706 | ) |
---|
| 707 | { |
---|
[16347a6] | 708 | (void) scheduler; |
---|
| 709 | (void) the_thread; |
---|
[197a614] | 710 | (void) node; |
---|
[16347a6] | 711 | return _Processor_mask_Is_subset( affinity, _SMP_Get_online_processors() ); |
---|
[0712d17] | 712 | } |
---|
| 713 | |
---|
[11e7893] | 714 | /** |
---|
| 715 | * @brief Sets the thread's scheduler's affinity. |
---|
| 716 | * |
---|
| 717 | * @param[in, out] the_thread The thread to set the affinity of. |
---|
| 718 | * @param cpusetsize The size of @a cpuset. |
---|
| 719 | * @param cpuset The cpuset to set the affinity. |
---|
| 720 | * |
---|
| 721 | * @retval true The operation succeeded. |
---|
| 722 | * @retval false The operation did not succeed. |
---|
| 723 | */ |
---|
[0712d17] | 724 | bool _Scheduler_Set_affinity( |
---|
[e135271] | 725 | Thread_Control *the_thread, |
---|
| 726 | size_t cpusetsize, |
---|
| 727 | const cpu_set_t *cpuset |
---|
[0712d17] | 728 | ); |
---|
| 729 | |
---|
[11e7893] | 730 | /** |
---|
| 731 | * @brief Blocks the thread. |
---|
| 732 | * |
---|
| 733 | * @param scheduler The scheduler instance. |
---|
| 734 | * @param the_thread The thread to block. |
---|
| 735 | * @param node The corresponding scheduler node. |
---|
| 736 | * @param extract Method to extract the thread. |
---|
| 737 | * @param schedule Method for scheduling threads. |
---|
| 738 | */ |
---|
[e5ca54c9] | 739 | RTEMS_INLINE_ROUTINE void _Scheduler_Generic_block( |
---|
[e1598a6] | 740 | const Scheduler_Control *scheduler, |
---|
| 741 | Thread_Control *the_thread, |
---|
[e382a1b] | 742 | Scheduler_Node *node, |
---|
[e1598a6] | 743 | void ( *extract )( |
---|
| 744 | const Scheduler_Control *, |
---|
[e382a1b] | 745 | Thread_Control *, |
---|
| 746 | Scheduler_Node * |
---|
| 747 | ), |
---|
[e1598a6] | 748 | void ( *schedule )( |
---|
| 749 | const Scheduler_Control *, |
---|
| 750 | Thread_Control *, |
---|
[e382a1b] | 751 | bool |
---|
| 752 | ) |
---|
[e5ca54c9] | 753 | ) |
---|
| 754 | { |
---|
[e382a1b] | 755 | ( *extract )( scheduler, the_thread, node ); |
---|
[e5ca54c9] | 756 | |
---|
| 757 | /* TODO: flash critical section? */ |
---|
| 758 | |
---|
[24934e36] | 759 | if ( _Thread_Is_executing( the_thread ) || _Thread_Is_heir( the_thread ) ) { |
---|
| 760 | ( *schedule )( scheduler, the_thread, true ); |
---|
[e5ca54c9] | 761 | } |
---|
| 762 | } |
---|
| 763 | |
---|
[11e7893] | 764 | /** |
---|
| 765 | * @brief Gets the number of processors of the scheduler. |
---|
| 766 | * |
---|
| 767 | * @param scheduler The scheduler instance to get the number of processors of. |
---|
| 768 | * |
---|
| 769 | * @return The number of processors. |
---|
| 770 | */ |
---|
[e239760] | 771 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_processor_count( |
---|
| 772 | const Scheduler_Control *scheduler |
---|
| 773 | ) |
---|
| 774 | { |
---|
| 775 | #if defined(RTEMS_SMP) |
---|
[6b1d8c7] | 776 | const Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
---|
| 777 | |
---|
| 778 | return _Processor_mask_Count( &context->Processors ); |
---|
[e239760] | 779 | #else |
---|
| 780 | (void) scheduler; |
---|
| 781 | |
---|
| 782 | return 1; |
---|
| 783 | #endif |
---|
| 784 | } |
---|
| 785 | |
---|
[11e7893] | 786 | /** |
---|
| 787 | * @brief Builds an object build id. |
---|
| 788 | * |
---|
| 789 | * @param scheduler_index The index to build the build id out of. |
---|
| 790 | * |
---|
| 791 | * @return The build id. |
---|
| 792 | */ |
---|
[b427a92] | 793 | RTEMS_INLINE_ROUTINE Objects_Id _Scheduler_Build_id( uint32_t scheduler_index ) |
---|
| 794 | { |
---|
| 795 | return _Objects_Build_id( |
---|
| 796 | OBJECTS_FAKE_OBJECTS_API, |
---|
| 797 | OBJECTS_FAKE_OBJECTS_SCHEDULERS, |
---|
| 798 | _Objects_Local_node, |
---|
[1d72f03] | 799 | (uint16_t) ( scheduler_index + 1 ) |
---|
[b427a92] | 800 | ); |
---|
| 801 | } |
---|
| 802 | |
---|
[11e7893] | 803 | /** |
---|
| 804 | * @brief Gets the scheduler index from the given object build id. |
---|
| 805 | * |
---|
| 806 | * @param id The object build id. |
---|
| 807 | * |
---|
| 808 | * @return The scheduler index. |
---|
| 809 | */ |
---|
[c8e83288] | 810 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_index_by_id( Objects_Id id ) |
---|
| 811 | { |
---|
| 812 | uint32_t minimum_id = _Scheduler_Build_id( 0 ); |
---|
| 813 | |
---|
| 814 | return id - minimum_id; |
---|
| 815 | } |
---|
| 816 | |
---|
[11e7893] | 817 | /** |
---|
| 818 | * @brief Gets the scheduler from the given object build id. |
---|
| 819 | * |
---|
| 820 | * @param id The object build id. |
---|
| 821 | * |
---|
| 822 | * @return The scheduler to the object id. |
---|
| 823 | */ |
---|
[2612a0b] | 824 | RTEMS_INLINE_ROUTINE const Scheduler_Control *_Scheduler_Get_by_id( |
---|
| 825 | Objects_Id id |
---|
[1b67535d] | 826 | ) |
---|
| 827 | { |
---|
[2612a0b] | 828 | uint32_t index; |
---|
[1b67535d] | 829 | |
---|
[2612a0b] | 830 | index = _Scheduler_Get_index_by_id( id ); |
---|
[1b67535d] | 831 | |
---|
[2612a0b] | 832 | if ( index >= _Scheduler_Count ) { |
---|
| 833 | return NULL; |
---|
| 834 | } |
---|
| 835 | |
---|
| 836 | return &_Scheduler_Table[ index ]; |
---|
[1b67535d] | 837 | } |
---|
| 838 | |
---|
[11e7893] | 839 | /** |
---|
| 840 | * @brief Gets the index of the scheduler |
---|
| 841 | * |
---|
| 842 | * @param scheduler The scheduler to get the index of. |
---|
| 843 | * |
---|
| 844 | * @return The index of the given scheduler. |
---|
| 845 | */ |
---|
[27270b0d] | 846 | RTEMS_INLINE_ROUTINE uint32_t _Scheduler_Get_index( |
---|
| 847 | const Scheduler_Control *scheduler |
---|
| 848 | ) |
---|
| 849 | { |
---|
| 850 | return (uint32_t) (scheduler - &_Scheduler_Table[ 0 ]); |
---|
| 851 | } |
---|
| 852 | |
---|
[8f0c7a46] | 853 | #if defined(RTEMS_SMP) |
---|
[5c3d250] | 854 | /** |
---|
| 855 | * @brief Gets an idle thread from the scheduler instance. |
---|
| 856 | * |
---|
[11e7893] | 857 | * @param context The scheduler instance context. |
---|
[5c3d250] | 858 | * |
---|
[11e7893] | 859 | * @return idle An idle thread for use. This function must always return an |
---|
[5c3d250] | 860 | * idle thread. If none is available, then this is a fatal error. |
---|
| 861 | */ |
---|
| 862 | typedef Thread_Control *( *Scheduler_Get_idle_thread )( |
---|
| 863 | Scheduler_Context *context |
---|
| 864 | ); |
---|
| 865 | |
---|
| 866 | /** |
---|
| 867 | * @brief Releases an idle thread to the scheduler instance for reuse. |
---|
| 868 | * |
---|
[11e7893] | 869 | * @param context The scheduler instance context. |
---|
| 870 | * @param idle The idle thread to release. |
---|
[5c3d250] | 871 | */ |
---|
| 872 | typedef void ( *Scheduler_Release_idle_thread )( |
---|
| 873 | Scheduler_Context *context, |
---|
| 874 | Thread_Control *idle |
---|
| 875 | ); |
---|
| 876 | |
---|
[11e7893] | 877 | /** |
---|
| 878 | * @brief Changes the threads state to the given new state. |
---|
| 879 | * |
---|
| 880 | * @param[out] the_thread The thread to change the state of. |
---|
| 881 | * @param new_state The new state for @a the_thread. |
---|
| 882 | */ |
---|
[5c3d250] | 883 | RTEMS_INLINE_ROUTINE void _Scheduler_Thread_change_state( |
---|
| 884 | Thread_Control *the_thread, |
---|
| 885 | Thread_Scheduler_state new_state |
---|
| 886 | ) |
---|
| 887 | { |
---|
[a7a8ec03] | 888 | _Assert( |
---|
| 889 | _ISR_lock_Is_owner( &the_thread->Scheduler.Lock ) |
---|
| 890 | || the_thread->Scheduler.state == THREAD_SCHEDULER_BLOCKED |
---|
| 891 | || !_System_state_Is_up( _System_state_Get() ) |
---|
| 892 | ); |
---|
[5c3d250] | 893 | |
---|
| 894 | the_thread->Scheduler.state = new_state; |
---|
| 895 | } |
---|
| 896 | |
---|
[11e7893] | 897 | /** |
---|
| 898 | * @brief Sets the scheduler node's idle thread. |
---|
| 899 | * |
---|
| 900 | * @param[in, out] node The node to receive an idle thread. |
---|
| 901 | * @param idle The idle thread control for the operation. |
---|
| 902 | */ |
---|
[be0366b] | 903 | RTEMS_INLINE_ROUTINE void _Scheduler_Set_idle_thread( |
---|
| 904 | Scheduler_Node *node, |
---|
| 905 | Thread_Control *idle |
---|
| 906 | ) |
---|
| 907 | { |
---|
| 908 | _Assert( _Scheduler_Node_get_idle( node ) == NULL ); |
---|
| 909 | _Assert( |
---|
| 910 | _Scheduler_Node_get_owner( node ) == _Scheduler_Node_get_user( node ) |
---|
| 911 | ); |
---|
| 912 | |
---|
| 913 | _Scheduler_Node_set_user( node, idle ); |
---|
| 914 | node->idle = idle; |
---|
| 915 | } |
---|
| 916 | |
---|
[5c3d250] | 917 | /** |
---|
[11e7893] | 918 | * @brief Uses an idle thread for this scheduler node. |
---|
[5c3d250] | 919 | * |
---|
[11e7893] | 920 | * A thread whose home scheduler node has a sticky level greater than zero may |
---|
| 921 | * use an idle thread in the home scheduler instance in the case it executes |
---|
| 922 | * currently in another scheduler instance or in the case it is in a blocking |
---|
[6771359f] | 923 | * state. |
---|
[5c3d250] | 924 | * |
---|
[11e7893] | 925 | * @param context The scheduler instance context. |
---|
| 926 | * @param[in, out] node The node which wants to use the idle thread. |
---|
| 927 | * @param cpu The processor for the idle thread. |
---|
| 928 | * @param get_idle_thread Function to get an idle thread. |
---|
[5c3d250] | 929 | */ |
---|
| 930 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Use_idle_thread( |
---|
| 931 | Scheduler_Context *context, |
---|
| 932 | Scheduler_Node *node, |
---|
[6771359f] | 933 | Per_CPU_Control *cpu, |
---|
[5c3d250] | 934 | Scheduler_Get_idle_thread get_idle_thread |
---|
| 935 | ) |
---|
| 936 | { |
---|
| 937 | Thread_Control *idle = ( *get_idle_thread )( context ); |
---|
| 938 | |
---|
[be0366b] | 939 | _Scheduler_Set_idle_thread( node, idle ); |
---|
[6771359f] | 940 | _Thread_Set_CPU( idle, cpu ); |
---|
[5c3d250] | 941 | return idle; |
---|
| 942 | } |
---|
| 943 | |
---|
[be0366b] | 944 | typedef enum { |
---|
| 945 | SCHEDULER_TRY_TO_SCHEDULE_DO_SCHEDULE, |
---|
| 946 | SCHEDULER_TRY_TO_SCHEDULE_DO_IDLE_EXCHANGE, |
---|
| 947 | SCHEDULER_TRY_TO_SCHEDULE_DO_BLOCK |
---|
| 948 | } Scheduler_Try_to_schedule_action; |
---|
| 949 | |
---|
[5c3d250] | 950 | /** |
---|
[11e7893] | 951 | * @brief Tries to schedule this scheduler node. |
---|
[5c3d250] | 952 | * |
---|
[11e7893] | 953 | * @param context The scheduler instance context. |
---|
| 954 | * @param[in, out] node The node which wants to get scheduled. |
---|
| 955 | * @param idle A potential idle thread used by a potential victim node. |
---|
| 956 | * @param get_idle_thread Function to get an idle thread. |
---|
[5c3d250] | 957 | * |
---|
| 958 | * @retval true This node can be scheduled. |
---|
[11e7893] | 959 | * @retval false This node cannot be scheduled. |
---|
[5c3d250] | 960 | */ |
---|
[be0366b] | 961 | RTEMS_INLINE_ROUTINE Scheduler_Try_to_schedule_action |
---|
| 962 | _Scheduler_Try_to_schedule_node( |
---|
[5c3d250] | 963 | Scheduler_Context *context, |
---|
| 964 | Scheduler_Node *node, |
---|
[be0366b] | 965 | Thread_Control *idle, |
---|
[5c3d250] | 966 | Scheduler_Get_idle_thread get_idle_thread |
---|
| 967 | ) |
---|
| 968 | { |
---|
[a7a8ec03] | 969 | ISR_lock_Context lock_context; |
---|
| 970 | Scheduler_Try_to_schedule_action action; |
---|
[76ad5e0c] | 971 | Thread_Control *owner; |
---|
[5c3d250] | 972 | |
---|
[be0366b] | 973 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_SCHEDULE; |
---|
[76ad5e0c] | 974 | owner = _Scheduler_Node_get_owner( node ); |
---|
| 975 | _Assert( _Scheduler_Node_get_user( node ) == owner ); |
---|
| 976 | _Assert( _Scheduler_Node_get_idle( node ) == NULL ); |
---|
[a7a8ec03] | 977 | |
---|
[76ad5e0c] | 978 | _Thread_Scheduler_acquire_critical( owner, &lock_context ); |
---|
[be0366b] | 979 | |
---|
[76ad5e0c] | 980 | if ( owner->Scheduler.state == THREAD_SCHEDULER_READY ) { |
---|
| 981 | _Thread_Scheduler_cancel_need_for_help( owner, _Thread_Get_CPU( owner ) ); |
---|
| 982 | _Scheduler_Thread_change_state( owner, THREAD_SCHEDULER_SCHEDULED ); |
---|
[6771359f] | 983 | } else if ( |
---|
[76ad5e0c] | 984 | owner->Scheduler.state == THREAD_SCHEDULER_SCHEDULED |
---|
| 985 | && node->sticky_level <= 1 |
---|
[6771359f] | 986 | ) { |
---|
| 987 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_BLOCK; |
---|
[76ad5e0c] | 988 | } else if ( node->sticky_level == 0 ) { |
---|
| 989 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_BLOCK; |
---|
[6771359f] | 990 | } else if ( idle != NULL ) { |
---|
| 991 | action = SCHEDULER_TRY_TO_SCHEDULE_DO_IDLE_EXCHANGE; |
---|
| 992 | } else { |
---|
| 993 | _Scheduler_Use_idle_thread( |
---|
| 994 | context, |
---|
| 995 | node, |
---|
[76ad5e0c] | 996 | _Thread_Get_CPU( owner ), |
---|
[6771359f] | 997 | get_idle_thread |
---|
| 998 | ); |
---|
[a7a8ec03] | 999 | } |
---|
| 1000 | |
---|
[76ad5e0c] | 1001 | _Thread_Scheduler_release_critical( owner, &lock_context ); |
---|
[be0366b] | 1002 | return action; |
---|
[5c3d250] | 1003 | } |
---|
| 1004 | |
---|
| 1005 | /** |
---|
[11e7893] | 1006 | * @brief Releases an idle thread using this scheduler node. |
---|
[5c3d250] | 1007 | * |
---|
[11e7893] | 1008 | * @param context The scheduler instance context. |
---|
| 1009 | * @param[in, out] node The node which may have an idle thread as user. |
---|
| 1010 | * @param release_idle_thread Function to release an idle thread. |
---|
[5c3d250] | 1011 | * |
---|
| 1012 | * @retval idle The idle thread which used this node. |
---|
| 1013 | * @retval NULL This node had no idle thread as an user. |
---|
| 1014 | */ |
---|
| 1015 | RTEMS_INLINE_ROUTINE Thread_Control *_Scheduler_Release_idle_thread( |
---|
| 1016 | Scheduler_Context *context, |
---|
| 1017 | Scheduler_Node *node, |
---|
| 1018 | Scheduler_Release_idle_thread release_idle_thread |
---|
| 1019 | ) |
---|
| 1020 | { |
---|
| 1021 | Thread_Control *idle = _Scheduler_Node_get_idle( node ); |
---|
| 1022 | |
---|
| 1023 | if ( idle != NULL ) { |
---|
| 1024 | Thread_Control *owner = _Scheduler_Node_get_owner( node ); |
---|
| 1025 | |
---|
| 1026 | node->idle = NULL; |
---|
| 1027 | _Scheduler_Node_set_user( node, owner ); |
---|
| 1028 | ( *release_idle_thread )( context, idle ); |
---|
| 1029 | } |
---|
| 1030 | |
---|
| 1031 | return idle; |
---|
| 1032 | } |
---|
| 1033 | |
---|
[11e7893] | 1034 | /** |
---|
| 1035 | * @brief Exchanges an idle thread from the scheduler node that uses it |
---|
| 1036 | * right now to another scheduler node. |
---|
| 1037 | * |
---|
| 1038 | * @param needs_idle The scheduler node that needs an idle thread. |
---|
| 1039 | * @param uses_idle The scheduler node that used the idle thread. |
---|
| 1040 | * @param idle The idle thread that is exchanged. |
---|
| 1041 | */ |
---|
[be0366b] | 1042 | RTEMS_INLINE_ROUTINE void _Scheduler_Exchange_idle_thread( |
---|
| 1043 | Scheduler_Node *needs_idle, |
---|
| 1044 | Scheduler_Node *uses_idle, |
---|
| 1045 | Thread_Control *idle |
---|
| 1046 | ) |
---|
| 1047 | { |
---|
| 1048 | uses_idle->idle = NULL; |
---|
| 1049 | _Scheduler_Node_set_user( |
---|
| 1050 | uses_idle, |
---|
| 1051 | _Scheduler_Node_get_owner( uses_idle ) |
---|
| 1052 | ); |
---|
| 1053 | _Scheduler_Set_idle_thread( needs_idle, idle ); |
---|
| 1054 | } |
---|
| 1055 | |
---|
[5c3d250] | 1056 | /** |
---|
[11e7893] | 1057 | * @brief Blocks this scheduler node. |
---|
[5c3d250] | 1058 | * |
---|
[11e7893] | 1059 | * @param context The scheduler instance context. |
---|
| 1060 | * @param[in, out] thread The thread which wants to get blocked referencing this |
---|
[5bd822a7] | 1061 | * node. This is not necessarily the user of this node in case the node |
---|
| 1062 | * participates in the scheduler helping protocol. |
---|
[11e7893] | 1063 | * @param[in, out] node The node which wants to get blocked. |
---|
| 1064 | * @param is_scheduled This node is scheduled. |
---|
| 1065 | * @param get_idle_thread Function to get an idle thread. |
---|
[5c3d250] | 1066 | * |
---|
[edb020c] | 1067 | * @retval thread_cpu The processor of the thread. Indicates to continue with |
---|
| 1068 | * the blocking operation. |
---|
| 1069 | * @retval NULL Otherwise. |
---|
[5c3d250] | 1070 | */ |
---|
[edb020c] | 1071 | RTEMS_INLINE_ROUTINE Per_CPU_Control *_Scheduler_Block_node( |
---|
[5c3d250] | 1072 | Scheduler_Context *context, |
---|
[cceb19f4] | 1073 | Thread_Control *thread, |
---|
[5c3d250] | 1074 | Scheduler_Node *node, |
---|
| 1075 | bool is_scheduled, |
---|
| 1076 | Scheduler_Get_idle_thread get_idle_thread |
---|
| 1077 | ) |
---|
| 1078 | { |
---|
[6771359f] | 1079 | int sticky_level; |
---|
[a7a8ec03] | 1080 | ISR_lock_Context lock_context; |
---|
[edb020c] | 1081 | Per_CPU_Control *thread_cpu; |
---|
[5c3d250] | 1082 | |
---|
[6771359f] | 1083 | sticky_level = node->sticky_level; |
---|
| 1084 | --sticky_level; |
---|
| 1085 | node->sticky_level = sticky_level; |
---|
| 1086 | _Assert( sticky_level >= 0 ); |
---|
| 1087 | |
---|
[a7a8ec03] | 1088 | _Thread_Scheduler_acquire_critical( thread, &lock_context ); |
---|
[edb020c] | 1089 | thread_cpu = _Thread_Get_CPU( thread ); |
---|
[351c14d] | 1090 | _Thread_Scheduler_cancel_need_for_help( thread, thread_cpu ); |
---|
[5bd822a7] | 1091 | _Scheduler_Thread_change_state( thread, THREAD_SCHEDULER_BLOCKED ); |
---|
[a7a8ec03] | 1092 | _Thread_Scheduler_release_critical( thread, &lock_context ); |
---|
[5c3d250] | 1093 | |
---|
[6771359f] | 1094 | if ( sticky_level > 0 ) { |
---|
| 1095 | if ( is_scheduled && _Scheduler_Node_get_idle( node ) == NULL ) { |
---|
| 1096 | Thread_Control *idle; |
---|
| 1097 | |
---|
| 1098 | idle = _Scheduler_Use_idle_thread( |
---|
| 1099 | context, |
---|
| 1100 | node, |
---|
| 1101 | thread_cpu, |
---|
| 1102 | get_idle_thread |
---|
| 1103 | ); |
---|
| 1104 | _Thread_Dispatch_update_heir( _Per_CPU_Get(), thread_cpu, idle ); |
---|
| 1105 | } |
---|
[5c3d250] | 1106 | |
---|
[6771359f] | 1107 | return NULL; |
---|
[5bd822a7] | 1108 | } |
---|
| 1109 | |
---|
[6771359f] | 1110 | _Assert( thread == _Scheduler_Node_get_user( node ) ); |
---|
| 1111 | return thread_cpu; |
---|
| 1112 | } |
---|
[5bd822a7] | 1113 | |
---|
[11e7893] | 1114 | /** |
---|
| 1115 | * @brief Discard the idle thread from the scheduler node. |
---|
| 1116 | * |
---|
| 1117 | * @param context The scheduler context. |
---|
| 1118 | * @param[in, out] the_thread The thread for the operation. |
---|
| 1119 | * @param[in, out] node The scheduler node to discard the idle thread from. |
---|
| 1120 | * @param release_idle_thread Method to release the idle thread from the context. |
---|
| 1121 | */ |
---|
[6771359f] | 1122 | RTEMS_INLINE_ROUTINE void _Scheduler_Discard_idle_thread( |
---|
| 1123 | Scheduler_Context *context, |
---|
| 1124 | Thread_Control *the_thread, |
---|
| 1125 | Scheduler_Node *node, |
---|
| 1126 | Scheduler_Release_idle_thread release_idle_thread |
---|
| 1127 | ) |
---|
| 1128 | { |
---|
| 1129 | Thread_Control *idle; |
---|
| 1130 | Thread_Control *owner; |
---|
| 1131 | Per_CPU_Control *cpu; |
---|
[5c3d250] | 1132 | |
---|
[6771359f] | 1133 | idle = _Scheduler_Node_get_idle( node ); |
---|
| 1134 | owner = _Scheduler_Node_get_owner( node ); |
---|
[5c3d250] | 1135 | |
---|
[6771359f] | 1136 | node->idle = NULL; |
---|
| 1137 | _Assert( _Scheduler_Node_get_user( node ) == idle ); |
---|
| 1138 | _Scheduler_Node_set_user( node, owner ); |
---|
| 1139 | ( *release_idle_thread )( context, idle ); |
---|
[5c3d250] | 1140 | |
---|
[6771359f] | 1141 | cpu = _Thread_Get_CPU( idle ); |
---|
| 1142 | _Thread_Set_CPU( the_thread, cpu ); |
---|
| 1143 | _Thread_Dispatch_update_heir( _Per_CPU_Get(), cpu, the_thread ); |
---|
[5c3d250] | 1144 | } |
---|
| 1145 | |
---|
| 1146 | /** |
---|
[11e7893] | 1147 | * @brief Unblocks this scheduler node. |
---|
[5c3d250] | 1148 | * |
---|
[11e7893] | 1149 | * @param context The scheduler instance context. |
---|
| 1150 | * @param[in, out] the_thread The thread which wants to get unblocked. |
---|
| 1151 | * @param[in, out] node The node which wants to get unblocked. |
---|
| 1152 | * @param is_scheduled This node is scheduled. |
---|
| 1153 | * @param release_idle_thread Function to release an idle thread. |
---|
[5c3d250] | 1154 | * |
---|
| 1155 | * @retval true Continue with the unblocking operation. |
---|
[11e7893] | 1156 | * @retval false Do not continue with the unblocking operation. |
---|
[5c3d250] | 1157 | */ |
---|
| 1158 | RTEMS_INLINE_ROUTINE bool _Scheduler_Unblock_node( |
---|
| 1159 | Scheduler_Context *context, |
---|
| 1160 | Thread_Control *the_thread, |
---|
| 1161 | Scheduler_Node *node, |
---|
| 1162 | bool is_scheduled, |
---|
| 1163 | Scheduler_Release_idle_thread release_idle_thread |
---|
| 1164 | ) |
---|
| 1165 | { |
---|
| 1166 | bool unblock; |
---|
| 1167 | |
---|
[6771359f] | 1168 | ++node->sticky_level; |
---|
| 1169 | _Assert( node->sticky_level > 0 ); |
---|
| 1170 | |
---|
[5c3d250] | 1171 | if ( is_scheduled ) { |
---|
[6771359f] | 1172 | _Scheduler_Discard_idle_thread( |
---|
[5bd822a7] | 1173 | context, |
---|
[6771359f] | 1174 | the_thread, |
---|
[5bd822a7] | 1175 | node, |
---|
| 1176 | release_idle_thread |
---|
| 1177 | ); |
---|
[6771359f] | 1178 | _Scheduler_Thread_change_state( the_thread, THREAD_SCHEDULER_SCHEDULED ); |
---|
[5c3d250] | 1179 | unblock = false; |
---|
| 1180 | } else { |
---|
| 1181 | _Scheduler_Thread_change_state( the_thread, THREAD_SCHEDULER_READY ); |
---|
| 1182 | unblock = true; |
---|
| 1183 | } |
---|
| 1184 | |
---|
| 1185 | return unblock; |
---|
| 1186 | } |
---|
[8f0c7a46] | 1187 | #endif |
---|
| 1188 | |
---|
[11e7893] | 1189 | /** |
---|
| 1190 | * @brief Updates the heir. |
---|
| 1191 | * |
---|
| 1192 | * @param[in, out] new_heir The new heir. |
---|
| 1193 | * @param force_dispatch Indicates whether the dispatch happens also if the |
---|
| 1194 | * currently running thread is set as not preemptible. |
---|
| 1195 | */ |
---|
[d37adfe5] | 1196 | RTEMS_INLINE_ROUTINE void _Scheduler_Update_heir( |
---|
| 1197 | Thread_Control *new_heir, |
---|
| 1198 | bool force_dispatch |
---|
| 1199 | ) |
---|
| 1200 | { |
---|
| 1201 | Thread_Control *heir = _Thread_Heir; |
---|
| 1202 | |
---|
| 1203 | if ( heir != new_heir && ( heir->is_preemptible || force_dispatch ) ) { |
---|
| 1204 | #if defined(RTEMS_SMP) |
---|
[baa13626] | 1205 | /* |
---|
| 1206 | * We need this state only for _Thread_Get_CPU_time_used(). Cannot use |
---|
| 1207 | * _Scheduler_Thread_change_state() since THREAD_SCHEDULER_BLOCKED to |
---|
| 1208 | * THREAD_SCHEDULER_BLOCKED state changes are illegal for the real SMP |
---|
| 1209 | * schedulers. |
---|
| 1210 | */ |
---|
| 1211 | heir->Scheduler.state = THREAD_SCHEDULER_BLOCKED; |
---|
| 1212 | new_heir->Scheduler.state = THREAD_SCHEDULER_SCHEDULED; |
---|
[d37adfe5] | 1213 | #endif |
---|
| 1214 | _Thread_Update_CPU_time_used( heir, _Thread_Get_CPU( heir ) ); |
---|
| 1215 | _Thread_Heir = new_heir; |
---|
| 1216 | _Thread_Dispatch_necessary = true; |
---|
| 1217 | } |
---|
| 1218 | } |
---|
| 1219 | |
---|
[11e7893] | 1220 | /** |
---|
| 1221 | * @brief Sets a new scheduler. |
---|
| 1222 | * |
---|
| 1223 | * @param new_scheduler The new scheduler to set. |
---|
| 1224 | * @param[in, out] the_thread The thread for the operations. |
---|
| 1225 | * @param priority The initial priority for the thread with the new scheduler. |
---|
| 1226 | * |
---|
| 1227 | * @retval STATUS_SUCCESSFUL The operation succeeded. |
---|
| 1228 | * @retval STATUS_RESOURCE_IN_USE The thread's wait queue is not empty. |
---|
| 1229 | * @retval STATUS_UNSATISFIED The new scheduler has no processors. |
---|
| 1230 | */ |
---|
[c0bd006] | 1231 | RTEMS_INLINE_ROUTINE Status_Control _Scheduler_Set( |
---|
| 1232 | const Scheduler_Control *new_scheduler, |
---|
| 1233 | Thread_Control *the_thread, |
---|
| 1234 | Priority_Control priority |
---|
| 1235 | ) |
---|
| 1236 | { |
---|
[2612a0b] | 1237 | Scheduler_Node *new_scheduler_node; |
---|
| 1238 | Scheduler_Node *old_scheduler_node; |
---|
| 1239 | #if defined(RTEMS_SMP) |
---|
| 1240 | ISR_lock_Context lock_context; |
---|
| 1241 | const Scheduler_Control *old_scheduler; |
---|
| 1242 | |
---|
| 1243 | #endif |
---|
[c0bd006] | 1244 | |
---|
[9e7fa07] | 1245 | if ( the_thread->Wait.queue != NULL ) { |
---|
[c0bd006] | 1246 | return STATUS_RESOURCE_IN_USE; |
---|
| 1247 | } |
---|
| 1248 | |
---|
[7f742432] | 1249 | old_scheduler_node = _Thread_Scheduler_get_home_node( the_thread ); |
---|
[5d6b211] | 1250 | _Priority_Plain_extract( |
---|
| 1251 | &old_scheduler_node->Wait.Priority, |
---|
| 1252 | &the_thread->Real_priority |
---|
| 1253 | ); |
---|
[c0bd006] | 1254 | |
---|
[7097962] | 1255 | if ( |
---|
| 1256 | !_Priority_Is_empty( &old_scheduler_node->Wait.Priority ) |
---|
[5d6b211] | 1257 | #if defined(RTEMS_SMP) |
---|
[7097962] | 1258 | || !_Chain_Has_only_one_node( &the_thread->Scheduler.Wait_nodes ) |
---|
| 1259 | || the_thread->Scheduler.pin_level != 0 |
---|
| 1260 | #endif |
---|
| 1261 | ) { |
---|
[2612a0b] | 1262 | _Priority_Plain_insert( |
---|
| 1263 | &old_scheduler_node->Wait.Priority, |
---|
| 1264 | &the_thread->Real_priority, |
---|
| 1265 | the_thread->Real_priority.priority |
---|
| 1266 | ); |
---|
[9e7fa07] | 1267 | return STATUS_RESOURCE_IN_USE; |
---|
| 1268 | } |
---|
| 1269 | |
---|
[7097962] | 1270 | #if defined(RTEMS_SMP) |
---|
[2612a0b] | 1271 | old_scheduler = _Thread_Scheduler_get_home( the_thread ); |
---|
[4a1bdd30] | 1272 | new_scheduler_node = _Thread_Scheduler_get_node_by_index( |
---|
| 1273 | the_thread, |
---|
| 1274 | _Scheduler_Get_index( new_scheduler ) |
---|
| 1275 | ); |
---|
[2612a0b] | 1276 | |
---|
| 1277 | _Scheduler_Acquire_critical( new_scheduler, &lock_context ); |
---|
| 1278 | |
---|
[4a1bdd30] | 1279 | if ( |
---|
| 1280 | _Scheduler_Get_processor_count( new_scheduler ) == 0 |
---|
| 1281 | || !( *new_scheduler->Operations.set_affinity )( |
---|
| 1282 | new_scheduler, |
---|
| 1283 | the_thread, |
---|
| 1284 | new_scheduler_node, |
---|
| 1285 | &the_thread->Scheduler.Affinity |
---|
| 1286 | ) |
---|
| 1287 | ) { |
---|
[2612a0b] | 1288 | _Scheduler_Release_critical( new_scheduler, &lock_context ); |
---|
| 1289 | _Priority_Plain_insert( |
---|
| 1290 | &old_scheduler_node->Wait.Priority, |
---|
| 1291 | &the_thread->Real_priority, |
---|
| 1292 | the_thread->Real_priority.priority |
---|
| 1293 | ); |
---|
| 1294 | return STATUS_UNSATISFIED; |
---|
| 1295 | } |
---|
| 1296 | |
---|
[7097962] | 1297 | _Assert( the_thread->Scheduler.pinned_scheduler == NULL ); |
---|
| 1298 | the_thread->Scheduler.home_scheduler = new_scheduler; |
---|
[2612a0b] | 1299 | |
---|
| 1300 | _Scheduler_Release_critical( new_scheduler, &lock_context ); |
---|
| 1301 | |
---|
[2403473] | 1302 | _Thread_Scheduler_process_requests( the_thread ); |
---|
[5d6b211] | 1303 | #else |
---|
| 1304 | new_scheduler_node = old_scheduler_node; |
---|
| 1305 | #endif |
---|
| 1306 | |
---|
[300f6a48] | 1307 | the_thread->Start.initial_priority = priority; |
---|
| 1308 | _Priority_Node_set_priority( &the_thread->Real_priority, priority ); |
---|
| 1309 | _Priority_Initialize_one( |
---|
[5d6b211] | 1310 | &new_scheduler_node->Wait.Priority, |
---|
[300f6a48] | 1311 | &the_thread->Real_priority |
---|
| 1312 | ); |
---|
[c0bd006] | 1313 | |
---|
| 1314 | #if defined(RTEMS_SMP) |
---|
[2612a0b] | 1315 | if ( old_scheduler != new_scheduler ) { |
---|
| 1316 | States_Control current_state; |
---|
[c0bd006] | 1317 | |
---|
[2612a0b] | 1318 | current_state = the_thread->current_state; |
---|
[c0bd006] | 1319 | |
---|
[2612a0b] | 1320 | if ( _States_Is_ready( current_state ) ) { |
---|
| 1321 | _Scheduler_Block( the_thread ); |
---|
| 1322 | } |
---|
[6771359f] | 1323 | |
---|
[2612a0b] | 1324 | _Assert( old_scheduler_node->sticky_level == 0 ); |
---|
| 1325 | _Assert( new_scheduler_node->sticky_level == 0 ); |
---|
[6771359f] | 1326 | |
---|
[2612a0b] | 1327 | _Chain_Extract_unprotected( &old_scheduler_node->Thread.Wait_node ); |
---|
| 1328 | _Assert( _Chain_Is_empty( &the_thread->Scheduler.Wait_nodes ) ); |
---|
| 1329 | _Chain_Initialize_one( |
---|
| 1330 | &the_thread->Scheduler.Wait_nodes, |
---|
| 1331 | &new_scheduler_node->Thread.Wait_node |
---|
| 1332 | ); |
---|
| 1333 | _Chain_Extract_unprotected( |
---|
| 1334 | &old_scheduler_node->Thread.Scheduler_node.Chain |
---|
| 1335 | ); |
---|
| 1336 | _Assert( _Chain_Is_empty( &the_thread->Scheduler.Scheduler_nodes ) ); |
---|
| 1337 | _Chain_Initialize_one( |
---|
| 1338 | &the_thread->Scheduler.Scheduler_nodes, |
---|
| 1339 | &new_scheduler_node->Thread.Scheduler_node.Chain |
---|
| 1340 | ); |
---|
[c0bd006] | 1341 | |
---|
[2612a0b] | 1342 | _Scheduler_Node_set_priority( new_scheduler_node, priority, false ); |
---|
[c0bd006] | 1343 | |
---|
[2612a0b] | 1344 | if ( _States_Is_ready( current_state ) ) { |
---|
| 1345 | _Scheduler_Unblock( the_thread ); |
---|
[c0bd006] | 1346 | } |
---|
[2612a0b] | 1347 | |
---|
| 1348 | return STATUS_SUCCESSFUL; |
---|
[c0bd006] | 1349 | } |
---|
| 1350 | #endif |
---|
| 1351 | |
---|
[5d6b211] | 1352 | _Scheduler_Node_set_priority( new_scheduler_node, priority, false ); |
---|
[c0bd006] | 1353 | _Scheduler_Update_priority( the_thread ); |
---|
| 1354 | return STATUS_SUCCESSFUL; |
---|
| 1355 | } |
---|
| 1356 | |
---|
[1f0d013] | 1357 | /** @} */ |
---|
[0faa9dad] | 1358 | |
---|
[c6e21ee1] | 1359 | #ifdef __cplusplus |
---|
| 1360 | } |
---|
| 1361 | #endif |
---|
| 1362 | |
---|
[0faa9dad] | 1363 | #endif |
---|
| 1364 | /* end of include file */ |
---|