[baff4da] | 1 | /** |
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[11874561] | 2 | * @file rtems/score/thread.h |
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[ac7d5ef0] | 3 | * |
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| 4 | * This include file contains all constants and structures associated |
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| 5 | * with the thread control block. |
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[baff4da] | 6 | */ |
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| 7 | |
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| 8 | /* |
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[6a07436] | 9 | * COPYRIGHT (c) 1989-2006. |
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[ac7d5ef0] | 10 | * On-Line Applications Research Corporation (OAR). |
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| 11 | * |
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[98e4ebf5] | 12 | * The license and distribution terms for this file may be |
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| 13 | * found in the file LICENSE in this distribution or at |
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[dd687d97] | 14 | * http://www.rtems.com/license/LICENSE. |
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[ac7d5ef0] | 15 | * |
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| 16 | * $Id$ |
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| 17 | */ |
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| 18 | |
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[092f142a] | 19 | #ifndef _RTEMS_SCORE_THREAD_H |
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| 20 | #define _RTEMS_SCORE_THREAD_H |
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[ac7d5ef0] | 21 | |
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[baff4da] | 22 | /** |
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| 23 | * @defgroup ScoreThread Thread Handler |
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| 24 | * |
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[6a07436] | 25 | * This handler encapsulates functionality related to the management of |
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| 26 | * threads. This includes the creation, deletion, and scheduling of threads. |
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[baff4da] | 27 | */ |
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| 28 | /**@{*/ |
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| 29 | |
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[ac7d5ef0] | 30 | #ifdef __cplusplus |
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| 31 | extern "C" { |
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| 32 | #endif |
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| 33 | |
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[5e9b32b] | 34 | #include <rtems/score/context.h> |
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| 35 | #include <rtems/score/cpu.h> |
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[97e2729d] | 36 | #if defined(RTEMS_MULTIPROCESSING) |
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[5e9b32b] | 37 | #include <rtems/score/mppkt.h> |
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[97e2729d] | 38 | #endif |
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[5e9b32b] | 39 | #include <rtems/score/object.h> |
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| 40 | #include <rtems/score/priority.h> |
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| 41 | #include <rtems/score/stack.h> |
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| 42 | #include <rtems/score/states.h> |
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| 43 | #include <rtems/score/tod.h> |
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| 44 | #include <rtems/score/tqdata.h> |
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| 45 | #include <rtems/score/watchdog.h> |
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[ac7d5ef0] | 46 | |
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[baff4da] | 47 | /** |
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[3a4ae6c] | 48 | * The following defines the "return type" of a thread. |
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[260b0c2] | 49 | * |
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[baff4da] | 50 | * @note This cannot always be right. Some APIs have void |
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[a0ed4ed] | 51 | * tasks/threads, others return pointers, others may |
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[260b0c2] | 52 | * return a numeric value. Hopefully a pointer is |
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[d6154c7] | 53 | * always at least as big as an uint32_t . :) |
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[ac7d5ef0] | 54 | */ |
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[260b0c2] | 55 | typedef void *Thread; |
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[ac7d5ef0] | 56 | |
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[baff4da] | 57 | /** |
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[3a4ae6c] | 58 | * The following defines the ways in which the entry point for a |
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| 59 | * thread can be invoked. Basically, it can be passed any |
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[d6154c7] | 60 | * combination/permutation of a pointer and an uint32_t value. |
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[3a4ae6c] | 61 | * |
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[baff4da] | 62 | * @note For now, we are ignoring the return type. |
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[ac7d5ef0] | 63 | */ |
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[3a4ae6c] | 64 | typedef enum { |
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| 65 | THREAD_START_NUMERIC, |
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| 66 | THREAD_START_POINTER, |
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| 67 | THREAD_START_BOTH_POINTER_FIRST, |
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| 68 | THREAD_START_BOTH_NUMERIC_FIRST |
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| 69 | } Thread_Start_types; |
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[ac7d5ef0] | 70 | |
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[6a07436] | 71 | /** This type corresponds to a very simple style thread entry point. */ |
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[0d051533] | 72 | typedef Thread ( *Thread_Entry )(); /* basic type */ |
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| 73 | |
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[6a07436] | 74 | /** This type corresponds to a thread entry point which takes a single |
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| 75 | * unsigned thirty-two bit integer as an argument. |
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| 76 | */ |
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[d6154c7] | 77 | typedef Thread ( *Thread_Entry_numeric )( uint32_t ); |
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[baff4da] | 78 | |
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[6a07436] | 79 | /** This type corresponds to a thread entry point which takes a single |
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| 80 | * untyped pointer as an argument. |
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[baff4da] | 81 | */ |
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[0d051533] | 82 | typedef Thread ( *Thread_Entry_pointer )( void * ); |
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[baff4da] | 83 | |
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[6a07436] | 84 | /** This type corresponds to a thread entry point which takes a single |
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| 85 | * untyped pointer and an unsigned thirty-two bit integer as arguments. |
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[baff4da] | 86 | */ |
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[d6154c7] | 87 | typedef Thread ( *Thread_Entry_both_pointer_first )( void *, uint32_t ); |
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[baff4da] | 88 | |
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[6a07436] | 89 | /** This type corresponds to a thread entry point which takes a single |
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| 90 | * unsigned thirty-two bit integer and an untyped pointer and an |
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| 91 | * as arguments. |
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[baff4da] | 92 | */ |
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[d6154c7] | 93 | typedef Thread ( *Thread_Entry_both_numeric_first )( uint32_t , void * ); |
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[ac7d5ef0] | 94 | |
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[baff4da] | 95 | /** |
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[2f200c7] | 96 | * The following lists the algorithms used to manage the thread cpu budget. |
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| 97 | * |
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| 98 | * Reset Timeslice: At each context switch, reset the time quantum. |
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| 99 | * Exhaust Timeslice: Only reset the quantum once it is consumed. |
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| 100 | * Callout: Execute routine when budget is consumed. |
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| 101 | */ |
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| 102 | typedef enum { |
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| 103 | THREAD_CPU_BUDGET_ALGORITHM_NONE, |
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| 104 | THREAD_CPU_BUDGET_ALGORITHM_RESET_TIMESLICE, |
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| 105 | THREAD_CPU_BUDGET_ALGORITHM_EXHAUST_TIMESLICE, |
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| 106 | THREAD_CPU_BUDGET_ALGORITHM_CALLOUT |
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| 107 | } Thread_CPU_budget_algorithms; |
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| 108 | |
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[6a07436] | 109 | /** This type defines the Thread Control Block structure. |
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[baff4da] | 110 | */ |
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[2f200c7] | 111 | typedef struct Thread_Control_struct Thread_Control; |
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| 112 | |
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[6a07436] | 113 | /** This defines thes the entry point for the thread specific timeslice |
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| 114 | * budget management algorithm. |
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[baff4da] | 115 | */ |
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[2f200c7] | 116 | typedef void (*Thread_CPU_budget_algorithm_callout )( Thread_Control * ); |
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| 117 | |
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[baff4da] | 118 | /** @brief Per Task Variable Manager Structure Forward Reference |
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| 119 | * |
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| 120 | * Forward reference to the per task variable structure. |
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[aad726e] | 121 | */ |
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| 122 | struct rtems_task_variable_tt; |
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| 123 | |
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[baff4da] | 124 | /** @brief Per Task Variable Manager Structure |
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| 125 | * |
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| 126 | * This is the internal structure used to manager per Task Variables. |
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| 127 | */ |
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[6a07436] | 128 | typedef struct { |
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[baff4da] | 129 | /** This field points to the next per task variable for this task. */ |
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[aad726e] | 130 | struct rtems_task_variable_tt *next; |
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[baff4da] | 131 | /** This field points to the physical memory location of this per |
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| 132 | * task variable. |
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| 133 | */ |
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[c941a98] | 134 | void **ptr; |
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[baff4da] | 135 | /** This field is to the global value for this per task variable. */ |
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[df49c60] | 136 | void *gval; |
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[baff4da] | 137 | /** This field is to this thread's value for this per task variable. */ |
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[df49c60] | 138 | void *tval; |
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[baff4da] | 139 | /** This field points to the destructor for this per task variable. */ |
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[c941a98] | 140 | void (*dtor)(void *); |
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[6a07436] | 141 | } rtems_task_variable_t; |
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[aad726e] | 142 | |
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[baff4da] | 143 | /** |
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[ac7d5ef0] | 144 | * The following structure contains the information which defines |
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| 145 | * the starting state of a thread. |
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| 146 | */ |
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| 147 | typedef struct { |
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[6a07436] | 148 | /** This field is the starting address for the thread. */ |
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| 149 | Thread_Entry entry_point; |
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| 150 | /** This field indicatres the how task is invoked. */ |
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| 151 | Thread_Start_types prototype; |
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| 152 | /** This field is the pointer argument passed at thread start. */ |
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| 153 | void *pointer_argument; |
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| 154 | /** This field is the numeric argument passed at thread start. */ |
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| 155 | uint32_t numeric_argument; |
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| 156 | /*-------------- initial execution modes ----------------- */ |
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| 157 | /** This field indicates whether the thread was preemptible when |
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| 158 | * it started. |
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| 159 | */ |
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[3a4ae6c] | 160 | boolean is_preemptible; |
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[6a07436] | 161 | /** This field indicates the CPU budget algorith. */ |
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[2f200c7] | 162 | Thread_CPU_budget_algorithms budget_algorithm; |
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[6a07436] | 163 | /** This field is the routine to invoke when the CPU allotment is |
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| 164 | * consumed. |
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| 165 | */ |
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[2f200c7] | 166 | Thread_CPU_budget_algorithm_callout budget_callout; |
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[6a07436] | 167 | /** This field is the initial ISR disable level of this thread. */ |
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[d6154c7] | 168 | uint32_t isr_level; |
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[6a07436] | 169 | /** This field is the initial priority. */ |
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| 170 | Priority_Control initial_priority; |
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| 171 | /** This field indicates whether the SuperCore allocated the stack. */ |
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[98162c35] | 172 | boolean core_allocated_stack; |
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[6a07436] | 173 | /** This field is the stack information. */ |
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| 174 | Stack_Control Initial_stack; |
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[47ca0d0a] | 175 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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[6a07436] | 176 | /** This field is the initial FP context area address. */ |
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[3c86f88] | 177 | Context_Control_fp *fp_context; |
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[17508d02] | 178 | #endif |
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[6a07436] | 179 | /** This field is the initial stack area address. */ |
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| 180 | void *stack; |
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[ac7d5ef0] | 181 | } Thread_Start_information; |
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| 182 | |
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[baff4da] | 183 | /** |
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[ac7d5ef0] | 184 | * The following structure contains the information necessary to manage |
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| 185 | * a thread which it is waiting for a resource. |
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| 186 | */ |
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[3a4ae6c] | 187 | #define THREAD_STATUS_PROXY_BLOCKING 0x1111111 |
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| 188 | |
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[baff4da] | 189 | /** @brief Thread Blocking Management Information |
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| 190 | * |
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| 191 | * This contains the information required to manage a thread while it is |
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| 192 | * blocked and to return information to it. |
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| 193 | */ |
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[ac7d5ef0] | 194 | typedef struct { |
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[baff4da] | 195 | /** This field is the Id of the object this thread is waiting upon. */ |
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| 196 | Objects_Id id; |
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| 197 | /** This field is used to return an integer while when blocked. */ |
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| 198 | uint32_t count; |
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| 199 | /** This field is the first pointer to a user return argument. */ |
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| 200 | void *return_argument; |
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| 201 | /** This field is the second pointer to a user return argument. */ |
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[3a4ae6c] | 202 | void *return_argument_1; |
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[baff4da] | 203 | /** This field contains any options in effect on this blocking operation. */ |
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[d6154c7] | 204 | uint32_t option; |
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[baff4da] | 205 | /** This field will contain the return status from a blocking operation. |
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| 206 | * |
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| 207 | * @note The following assumes that all API return codes can be |
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| 208 | * treated as an uint32_t. |
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[3a4ae6c] | 209 | */ |
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[baff4da] | 210 | uint32_t return_code; |
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[3a4ae6c] | 211 | |
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[baff4da] | 212 | /** This field is the chain header for the second through Nth tasks |
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| 213 | * of the same priority blocked waiting on the same object. |
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| 214 | */ |
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| 215 | Chain_Control Block2n; |
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| 216 | /** This field points to the thread queue on which this thread is blocked. */ |
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| 217 | Thread_queue_Control *queue; |
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[ac7d5ef0] | 218 | } Thread_Wait_information; |
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| 219 | |
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[baff4da] | 220 | /** |
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[ac7d5ef0] | 221 | * The following defines the control block used to manage |
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| 222 | * each thread proxy. |
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| 223 | * |
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[baff4da] | 224 | * @note It is critical that proxies and threads have identical |
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[ac7d5ef0] | 225 | * memory images for the shared part. |
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| 226 | */ |
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| 227 | typedef struct { |
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[6a07436] | 228 | /** This field is the object management structure for each proxy. */ |
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[ac7d5ef0] | 229 | Objects_Control Object; |
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[6a07436] | 230 | /** This field is the current execution state of this proxy. */ |
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[ac7d5ef0] | 231 | States_Control current_state; |
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[6a07436] | 232 | /** This field is the current priority state of this proxy. */ |
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[7f6a24ab] | 233 | Priority_Control current_priority; |
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[6a07436] | 234 | /** This field is the base priority of this proxy. */ |
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[7f6a24ab] | 235 | Priority_Control real_priority; |
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[6a07436] | 236 | /** This field is the number of mutexes currently held by this proxy. */ |
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[d6154c7] | 237 | uint32_t resource_count; |
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[6a07436] | 238 | /** This field is the blocking information for this proxy. */ |
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[ac7d5ef0] | 239 | Thread_Wait_information Wait; |
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[6a07436] | 240 | /** This field is the Watchdog used to manage proxy delays and timeouts. */ |
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[ac7d5ef0] | 241 | Watchdog_Control Timer; |
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[97e2729d] | 242 | #if defined(RTEMS_MULTIPROCESSING) |
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[6a07436] | 243 | /** This field is the received response packet in an MP system. */ |
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[3a4ae6c] | 244 | MP_packet_Prefix *receive_packet; |
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[97e2729d] | 245 | #endif |
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[ac7d5ef0] | 246 | /****************** end of common block ********************/ |
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[6a07436] | 247 | /** This field is used to manage the set of proxies in the system. */ |
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[ac7d5ef0] | 248 | Chain_Node Active; |
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| 249 | } Thread_Proxy_control; |
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| 250 | |
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[baff4da] | 251 | /** |
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[ac7d5ef0] | 252 | * The following record defines the control block used |
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| 253 | * to manage each thread. |
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| 254 | * |
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[baff4da] | 255 | * @note It is critical that proxies and threads have identical |
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[ac7d5ef0] | 256 | * memory images for the shared part. |
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| 257 | */ |
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[3a4ae6c] | 258 | typedef enum { |
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[6a07436] | 259 | /** This value is for the Classic RTEMS API. */ |
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[5e9b32b] | 260 | THREAD_API_RTEMS, |
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[6a07436] | 261 | /** This value is for the POSIX API. */ |
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[352c9b2] | 262 | THREAD_API_POSIX, |
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[6a07436] | 263 | /** This value is for the ITRON API. */ |
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[352c9b2] | 264 | THREAD_API_ITRON |
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[3a4ae6c] | 265 | } Thread_APIs; |
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[7f6a24ab] | 266 | |
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[6a07436] | 267 | /** This macro defines the first API which has threads. */ |
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[3a4ae6c] | 268 | #define THREAD_API_FIRST THREAD_API_RTEMS |
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[baff4da] | 269 | |
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[6a07436] | 270 | /** This macro defines the last API which has threads. */ |
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[352c9b2] | 271 | #define THREAD_API_LAST THREAD_API_ITRON |
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[7f6a24ab] | 272 | |
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[baff4da] | 273 | /** |
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[6a07436] | 274 | * This structure defines the Thread Control Block (TCB). |
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[baff4da] | 275 | */ |
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[2f200c7] | 276 | struct Thread_Control_struct { |
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[6a07436] | 277 | /** This field is the object management structure for each thread. */ |
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| 278 | Objects_Control Object; |
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| 279 | /** This field is the current execution state of this thread. */ |
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| 280 | States_Control current_state; |
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| 281 | /** This field is the current priority state of this thread. */ |
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| 282 | Priority_Control current_priority; |
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| 283 | /** This field is the base priority of this thread. */ |
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| 284 | Priority_Control real_priority; |
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| 285 | /** This field is the number of mutexes currently held by this thread. */ |
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| 286 | uint32_t resource_count; |
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| 287 | /** This field is the blocking information for this thread. */ |
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| 288 | Thread_Wait_information Wait; |
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| 289 | /** This field is the Watchdog used to manage thread delays and timeouts. */ |
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| 290 | Watchdog_Control Timer; |
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[97e2729d] | 291 | #if defined(RTEMS_MULTIPROCESSING) |
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[6a07436] | 292 | /** This field is the received response packet in an MP system. */ |
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| 293 | MP_packet_Prefix *receive_packet; |
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[97e2729d] | 294 | #endif |
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[6a07436] | 295 | /*================= end of common block =================*/ |
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| 296 | /** This field is the number of nested suspend calls. */ |
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[d6154c7] | 297 | uint32_t suspend_count; |
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[6a07436] | 298 | /** This field is true if the thread is offered globally */ |
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[2f200c7] | 299 | boolean is_global; |
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[6a07436] | 300 | /** This field is is true if the post task context switch should be |
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| 301 | * executed for this thread at the next context switch. |
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| 302 | */ |
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[2f200c7] | 303 | boolean do_post_task_switch_extension; |
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[6a07436] | 304 | /** This field is true if the thread is preemptible. */ |
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[2f200c7] | 305 | boolean is_preemptible; |
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[6a07436] | 306 | /** This field is the GNAT self context pointer. */ |
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[847375f] | 307 | void *rtems_ada_self; |
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[6a07436] | 308 | /** This field is the length of the time quantum that this thread is |
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| 309 | * allowed to consume. The algorithm used to manage limits on CPU usage |
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| 310 | * is specified by budget_algorithm. |
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| 311 | */ |
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[d6154c7] | 312 | uint32_t cpu_time_budget; |
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[6a07436] | 313 | /** This field is the algorithm used to manage this thread's time |
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| 314 | * quantum. The algorithm may be specified as none which case, |
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| 315 | * no limit is in place. |
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| 316 | */ |
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[2f200c7] | 317 | Thread_CPU_budget_algorithms budget_algorithm; |
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[6a07436] | 318 | /** This field is the method invoked with the budgeted time is consumed. */ |
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[2f200c7] | 319 | Thread_CPU_budget_algorithm_callout budget_callout; |
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| 320 | |
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[6a07436] | 321 | /** This field is the number of clock ticks executed by this thread |
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| 322 | * since it was created. |
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| 323 | */ |
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[d6154c7] | 324 | uint32_t ticks_executed; |
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[6a07436] | 325 | /** This field points to the Ready FIFO for this priority. */ |
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[2f200c7] | 326 | Chain_Control *ready; |
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[6a07436] | 327 | /** This field contains precalculated priority map indices. */ |
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[2f200c7] | 328 | Priority_Information Priority_map; |
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[6a07436] | 329 | /** This field contains information about the starting state of |
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| 330 | * this thread. |
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| 331 | */ |
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[2f200c7] | 332 | Thread_Start_information Start; |
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[6a07436] | 333 | /** This field contains the context of this thread. */ |
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[2f200c7] | 334 | Context_Control Registers; |
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[499d443] | 335 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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[6a07436] | 336 | /** This field points to the floating point context for this thread. |
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| 337 | * If NULL, the thread is integer only. |
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| 338 | */ |
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[3c86f88] | 339 | Context_Control_fp *fp_context; |
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[17508d02] | 340 | #endif |
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[6a07436] | 341 | /** This field points to the newlib reentrancy structure for this thread. */ |
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[d36b3152] | 342 | struct _reent *libc_reent; |
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[6a07436] | 343 | /** This array contains the API extension area pointers. */ |
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[2f200c7] | 344 | void *API_Extensions[ THREAD_API_LAST + 1 ]; |
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[6a07436] | 345 | /** This field points to the user extension pointers. */ |
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[2f200c7] | 346 | void **extensions; |
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[6a07436] | 347 | /** This field points to the set of per task variables. */ |
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[aad726e] | 348 | rtems_task_variable_t *task_variables; |
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[2f200c7] | 349 | }; |
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[ac7d5ef0] | 350 | |
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[baff4da] | 351 | /** |
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[847375f] | 352 | * Self for the GNU Ada Run-Time |
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| 353 | */ |
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| 354 | SCORE_EXTERN void *rtems_ada_self; |
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[05279b84] | 355 | |
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[baff4da] | 356 | /** |
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[adf98bd] | 357 | * The following defines the information control block used to |
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| 358 | * manage this class of objects. |
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| 359 | */ |
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[c627b2a3] | 360 | SCORE_EXTERN Objects_Information _Thread_Internal_information; |
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[05279b84] | 361 | |
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[baff4da] | 362 | /** |
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[adf98bd] | 363 | * The following define the thread control pointers used to access |
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| 364 | * and manipulate the idle thread. |
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| 365 | */ |
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[c627b2a3] | 366 | SCORE_EXTERN Thread_Control *_Thread_Idle; |
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[adf98bd] | 367 | |
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[baff4da] | 368 | /** |
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[3a4ae6c] | 369 | * The following context area contains the context of the "thread" |
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[a0ed4ed] | 370 | * which invoked the start multitasking routine. This context is |
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[3a4ae6c] | 371 | * restored as the last action of the stop multitasking routine. Thus |
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| 372 | * control of the processor can be returned to the environment |
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| 373 | * which initiated the system. |
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[ac7d5ef0] | 374 | */ |
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[c627b2a3] | 375 | SCORE_EXTERN Context_Control _Thread_BSP_context; |
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[05279b84] | 376 | |
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[6a07436] | 377 | /** |
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[ac7d5ef0] | 378 | * The following declares the dispatch critical section nesting |
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| 379 | * counter which is used to prevent context switches at inopportune |
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| 380 | * moments. |
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| 381 | */ |
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[d6154c7] | 382 | SCORE_EXTERN volatile uint32_t _Thread_Dispatch_disable_level; |
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[ac7d5ef0] | 383 | |
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[baff4da] | 384 | /** |
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[1b17790c] | 385 | * If this is non-zero, then the post-task switch extension |
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| 386 | * is run regardless of the state of the per thread flag. |
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| 387 | */ |
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[d6154c7] | 388 | SCORE_EXTERN uint32_t _Thread_Do_post_task_switch_extension; |
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[1b17790c] | 389 | |
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[baff4da] | 390 | /** |
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[3a4ae6c] | 391 | * The following holds how many user extensions are in the system. This |
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| 392 | * is used to determine how many user extension data areas to allocate |
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| 393 | * per thread. |
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| 394 | */ |
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[d6154c7] | 395 | SCORE_EXTERN uint32_t _Thread_Maximum_extensions; |
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[3a4ae6c] | 396 | |
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[baff4da] | 397 | /** |
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[7aa4671] | 398 | * The following is used to manage the length of a timeslice quantum. |
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[ac7d5ef0] | 399 | */ |
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[d6154c7] | 400 | SCORE_EXTERN uint32_t _Thread_Ticks_per_timeslice; |
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[ac7d5ef0] | 401 | |
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[baff4da] | 402 | /** |
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[ac7d5ef0] | 403 | * The following points to the array of FIFOs used to manage the |
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| 404 | * set of ready threads. |
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| 405 | */ |
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[c627b2a3] | 406 | SCORE_EXTERN Chain_Control *_Thread_Ready_chain; |
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[ac7d5ef0] | 407 | |
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[baff4da] | 408 | /** |
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[ac7d5ef0] | 409 | * The following points to the thread which is currently executing. |
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| 410 | * This thread is implicitly manipulated by numerous directives. |
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| 411 | */ |
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[c627b2a3] | 412 | SCORE_EXTERN Thread_Control *_Thread_Executing; |
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[ac7d5ef0] | 413 | |
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[baff4da] | 414 | /** |
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[ac7d5ef0] | 415 | * The following points to the highest priority ready thread |
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[3a4ae6c] | 416 | * in the system. Unless the current thread is not preemptibl, |
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[ac7d5ef0] | 417 | * then this thread will be context switched to when the next |
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| 418 | * dispatch occurs. |
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| 419 | */ |
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[c627b2a3] | 420 | SCORE_EXTERN Thread_Control *_Thread_Heir; |
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[ac7d5ef0] | 421 | |
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[baff4da] | 422 | /** |
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[ac7d5ef0] | 423 | * The following points to the thread whose floating point |
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| 424 | * context is currently loaded. |
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| 425 | */ |
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[499d443] | 426 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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[c627b2a3] | 427 | SCORE_EXTERN Thread_Control *_Thread_Allocated_fp; |
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[17508d02] | 428 | #endif |
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[ac7d5ef0] | 429 | |
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[baff4da] | 430 | /** |
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[0df8293e] | 431 | * The C library re-enter-rant global pointer. Some C library implementations |
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| 432 | * such as newlib have a single global pointer that changed during a context |
---|
| 433 | * switch. The pointer points to that global pointer. The Thread control block |
---|
| 434 | * holds a pointer to the task specific data. |
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| 435 | */ |
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[d36b3152] | 436 | SCORE_EXTERN struct _reent **_Thread_libc_reent; |
---|
[0df8293e] | 437 | |
---|
[baff4da] | 438 | /** |
---|
[ac7d5ef0] | 439 | * This routine performs the initialization necessary for this handler. |
---|
| 440 | */ |
---|
| 441 | void _Thread_Handler_initialization ( |
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[d6154c7] | 442 | uint32_t ticks_per_timeslice, |
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| 443 | uint32_t maximum_extensions, |
---|
| 444 | uint32_t maximum_proxies |
---|
[ac7d5ef0] | 445 | ); |
---|
| 446 | |
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[baff4da] | 447 | /** |
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[adf98bd] | 448 | * This routine creates the idle thread. |
---|
| 449 | * |
---|
[baff4da] | 450 | * @warning No thread should be created before this one. |
---|
[adf98bd] | 451 | */ |
---|
| 452 | void _Thread_Create_idle( void ); |
---|
| 453 | |
---|
[baff4da] | 454 | /** |
---|
[ac7d5ef0] | 455 | * This routine initiates multitasking. It is invoked only as |
---|
| 456 | * part of initialization and its invocation is the last act of |
---|
[3a4ae6c] | 457 | * the non-multitasking part of the system initialization. |
---|
[ac7d5ef0] | 458 | */ |
---|
[b2b52cbc] | 459 | void _Thread_Start_multitasking( void ); |
---|
[ac7d5ef0] | 460 | |
---|
[baff4da] | 461 | /** |
---|
[ac7d5ef0] | 462 | * This routine is responsible for transferring control of the |
---|
| 463 | * processor from the executing thread to the heir thread. As part |
---|
| 464 | * of this process, it is responsible for the following actions: |
---|
| 465 | * |
---|
| 466 | * + saving the context of the executing thread |
---|
| 467 | * + restoring the context of the heir thread |
---|
| 468 | * + dispatching any signals for the resulting executing thread |
---|
| 469 | */ |
---|
| 470 | void _Thread_Dispatch( void ); |
---|
| 471 | |
---|
[baff4da] | 472 | /** |
---|
[1178b8c] | 473 | * Allocate the requested stack space for the thread. |
---|
| 474 | * return the actual size allocated after any adjustment |
---|
| 475 | * or return zero if the allocation failed. |
---|
| 476 | * Set the Start.stack field to the address of the stack |
---|
| 477 | */ |
---|
| 478 | |
---|
[728a0bd3] | 479 | size_t _Thread_Stack_Allocate( |
---|
[1178b8c] | 480 | Thread_Control *the_thread, |
---|
[728a0bd3] | 481 | size_t stack_size |
---|
[1178b8c] | 482 | ); |
---|
| 483 | |
---|
[baff4da] | 484 | /** |
---|
[1178b8c] | 485 | * Deallocate the Thread's stack. |
---|
| 486 | */ |
---|
| 487 | void _Thread_Stack_Free( |
---|
| 488 | Thread_Control *the_thread |
---|
| 489 | ); |
---|
| 490 | |
---|
[baff4da] | 491 | /** |
---|
[f6d0821] | 492 | * This routine initializes the specified the thread. It allocates |
---|
| 493 | * all memory associated with this thread. It completes by adding |
---|
| 494 | * the thread to the local object table so operations on this |
---|
| 495 | * thread id are allowed. |
---|
[2f200c7] | 496 | * |
---|
[baff4da] | 497 | * @note If stack_area is NULL, it is allocated from the workspace. |
---|
[2f200c7] | 498 | * |
---|
[baff4da] | 499 | * @note If the stack is allocated from the workspace, then it is |
---|
| 500 | * guaranteed to be of at least minimum size. |
---|
[7f6a24ab] | 501 | */ |
---|
| 502 | boolean _Thread_Initialize( |
---|
[2f200c7] | 503 | Objects_Information *information, |
---|
| 504 | Thread_Control *the_thread, |
---|
| 505 | void *stack_area, |
---|
[728a0bd3] | 506 | size_t stack_size, |
---|
[2f200c7] | 507 | boolean is_fp, |
---|
| 508 | Priority_Control priority, |
---|
| 509 | boolean is_preemptible, |
---|
| 510 | Thread_CPU_budget_algorithms budget_algorithm, |
---|
| 511 | Thread_CPU_budget_algorithm_callout budget_callout, |
---|
[d6154c7] | 512 | uint32_t isr_level, |
---|
[2f200c7] | 513 | Objects_Name name |
---|
[7f6a24ab] | 514 | ); |
---|
| 515 | |
---|
[baff4da] | 516 | /** |
---|
[f6d0821] | 517 | * This routine initializes the executable information for a thread |
---|
| 518 | * and makes it ready to execute. After this routine executes, the |
---|
| 519 | * thread competes with all other threads for CPU time. |
---|
[7f6a24ab] | 520 | */ |
---|
| 521 | boolean _Thread_Start( |
---|
| 522 | Thread_Control *the_thread, |
---|
| 523 | Thread_Start_types the_prototype, |
---|
| 524 | void *entry_point, |
---|
| 525 | void *pointer_argument, |
---|
[d6154c7] | 526 | uint32_t numeric_argument |
---|
[7f6a24ab] | 527 | ); |
---|
| 528 | |
---|
[baff4da] | 529 | /** |
---|
[f6d0821] | 530 | * This support routine restarts the specified task in a way that the |
---|
| 531 | * next time this thread executes, it will begin execution at its |
---|
| 532 | * original starting point. |
---|
[baff4da] | 533 | * |
---|
| 534 | * TODO: multiple task arg profiles |
---|
[7f6a24ab] | 535 | */ |
---|
| 536 | boolean _Thread_Restart( |
---|
| 537 | Thread_Control *the_thread, |
---|
| 538 | void *pointer_argument, |
---|
[d6154c7] | 539 | uint32_t numeric_argument |
---|
[7f6a24ab] | 540 | ); |
---|
| 541 | |
---|
[baff4da] | 542 | /** |
---|
[f6d0821] | 543 | * This routine resets a thread to its initial state but does |
---|
| 544 | * not restart it. |
---|
| 545 | */ |
---|
| 546 | void _Thread_Reset( |
---|
| 547 | Thread_Control *the_thread, |
---|
| 548 | void *pointer_argument, |
---|
[d6154c7] | 549 | uint32_t numeric_argument |
---|
[f6d0821] | 550 | ); |
---|
| 551 | |
---|
[baff4da] | 552 | /** |
---|
[f6d0821] | 553 | * This routine frees all memory associated with the specified |
---|
| 554 | * thread and removes it from the local object table so no further |
---|
| 555 | * operations on this thread are allowed. |
---|
[7f6a24ab] | 556 | */ |
---|
| 557 | void _Thread_Close( |
---|
| 558 | Objects_Information *information, |
---|
| 559 | Thread_Control *the_thread |
---|
| 560 | ); |
---|
| 561 | |
---|
[baff4da] | 562 | /** |
---|
[ac7d5ef0] | 563 | * This routine removes any set states for the_thread. It performs |
---|
| 564 | * any necessary scheduling operations including the selection of |
---|
| 565 | * a new heir thread. |
---|
| 566 | */ |
---|
| 567 | void _Thread_Ready( |
---|
| 568 | Thread_Control *the_thread |
---|
| 569 | ); |
---|
| 570 | |
---|
[baff4da] | 571 | /** |
---|
[ac7d5ef0] | 572 | * This routine clears the indicated STATES for the_thread. It performs |
---|
| 573 | * any necessary scheduling operations including the selection of |
---|
| 574 | * a new heir thread. |
---|
| 575 | */ |
---|
| 576 | void _Thread_Clear_state( |
---|
| 577 | Thread_Control *the_thread, |
---|
| 578 | States_Control state |
---|
| 579 | ); |
---|
| 580 | |
---|
[baff4da] | 581 | /** |
---|
[ac7d5ef0] | 582 | * This routine sets the indicated states for the_thread. It performs |
---|
| 583 | * any necessary scheduling operations including the selection of |
---|
| 584 | * a new heir thread. |
---|
| 585 | */ |
---|
| 586 | void _Thread_Set_state( |
---|
| 587 | Thread_Control *the_thread, |
---|
| 588 | States_Control state |
---|
| 589 | ); |
---|
| 590 | |
---|
[baff4da] | 591 | /** |
---|
[ac7d5ef0] | 592 | * This routine sets the TRANSIENT state for the_thread. It performs |
---|
| 593 | * any necessary scheduling operations including the selection of |
---|
| 594 | * a new heir thread. |
---|
| 595 | */ |
---|
| 596 | void _Thread_Set_transient( |
---|
| 597 | Thread_Control *the_thread |
---|
| 598 | ); |
---|
| 599 | |
---|
[baff4da] | 600 | /** |
---|
[ac7d5ef0] | 601 | * This routine is invoked upon expiration of the currently |
---|
| 602 | * executing thread's timeslice. If no other thread's are ready |
---|
| 603 | * at the priority of the currently executing thread, then the |
---|
| 604 | * executing thread's timeslice is reset. Otherwise, the |
---|
| 605 | * currently executing thread is placed at the rear of the |
---|
[3a4ae6c] | 606 | * FIFO for this priority and a new heir is selected. |
---|
[ac7d5ef0] | 607 | */ |
---|
| 608 | void _Thread_Reset_timeslice( void ); |
---|
| 609 | |
---|
[baff4da] | 610 | /** |
---|
[ac7d5ef0] | 611 | * This routine is invoked as part of processing each clock tick. |
---|
| 612 | * It is responsible for determining if the current thread allows |
---|
| 613 | * timeslicing and, if so, when its timeslice expires. |
---|
| 614 | */ |
---|
| 615 | void _Thread_Tickle_timeslice( void ); |
---|
| 616 | |
---|
[baff4da] | 617 | /** |
---|
[ac7d5ef0] | 618 | * This routine is invoked when a thread wishes to voluntarily |
---|
| 619 | * transfer control of the processor to another thread of equal |
---|
| 620 | * or greater priority. |
---|
| 621 | */ |
---|
| 622 | void _Thread_Yield_processor( void ); |
---|
| 623 | |
---|
[baff4da] | 624 | /** |
---|
[eb02f47] | 625 | * This routine is invoked to rotate the ready queue for the |
---|
| 626 | * given priority. It can be used to yeild the processor |
---|
| 627 | * by rotating the executing threads ready queue. |
---|
| 628 | */ |
---|
| 629 | void _Thread_Rotate_Ready_Queue( |
---|
| 630 | Priority_Control priority |
---|
| 631 | ); |
---|
| 632 | |
---|
[baff4da] | 633 | /** |
---|
[ac7d5ef0] | 634 | * This routine initializes the context of the_thread to its |
---|
| 635 | * appropriate starting state. |
---|
| 636 | */ |
---|
| 637 | void _Thread_Load_environment( |
---|
| 638 | Thread_Control *the_thread |
---|
| 639 | ); |
---|
| 640 | |
---|
[baff4da] | 641 | /** |
---|
[ac7d5ef0] | 642 | * This routine is the wrapper function for all threads. It is |
---|
| 643 | * the starting point for all threads. The user provided thread |
---|
| 644 | * entry point is invoked by this routine. Operations |
---|
| 645 | * which must be performed immediately before and after the user's |
---|
| 646 | * thread executes are found here. |
---|
| 647 | */ |
---|
| 648 | void _Thread_Handler( void ); |
---|
| 649 | |
---|
[baff4da] | 650 | /** |
---|
[ac7d5ef0] | 651 | * This routine is invoked when a thread must be unblocked at the |
---|
[3a4ae6c] | 652 | * end of a time based delay (i.e. wake after or wake when). |
---|
[ac7d5ef0] | 653 | */ |
---|
| 654 | void _Thread_Delay_ended( |
---|
| 655 | Objects_Id id, |
---|
| 656 | void *ignored |
---|
| 657 | ); |
---|
| 658 | |
---|
[baff4da] | 659 | /** |
---|
[ac7d5ef0] | 660 | * This routine changes the current priority of the_thread to |
---|
| 661 | * new_priority. It performs any necessary scheduling operations |
---|
| 662 | * including the selection of a new heir thread. |
---|
| 663 | */ |
---|
| 664 | void _Thread_Change_priority ( |
---|
| 665 | Thread_Control *the_thread, |
---|
[f926b34] | 666 | Priority_Control new_priority, |
---|
| 667 | boolean prepend_it |
---|
[ac7d5ef0] | 668 | ); |
---|
| 669 | |
---|
[baff4da] | 670 | /** |
---|
[ac7d5ef0] | 671 | * This routine updates the priority related fields in the_thread |
---|
| 672 | * control block to indicate the current priority is now new_priority. |
---|
| 673 | */ |
---|
| 674 | void _Thread_Set_priority( |
---|
| 675 | Thread_Control *the_thread, |
---|
[7f6a24ab] | 676 | Priority_Control new_priority |
---|
[ac7d5ef0] | 677 | ); |
---|
| 678 | |
---|
[baff4da] | 679 | /** |
---|
[eb02f47] | 680 | * This routine updates the related suspend fields in the_thread |
---|
| 681 | * control block to indicate the current nested level. |
---|
| 682 | */ |
---|
| 683 | void _Thread_Suspend( |
---|
| 684 | Thread_Control *the_thread |
---|
| 685 | ); |
---|
| 686 | |
---|
[baff4da] | 687 | /** |
---|
[eb02f47] | 688 | * This routine updates the related suspend fields in the_thread |
---|
| 689 | * control block to indicate the current nested level. A force |
---|
| 690 | * parameter of TRUE will force a resume and clear the suspend count. |
---|
| 691 | */ |
---|
| 692 | void _Thread_Resume( |
---|
| 693 | Thread_Control *the_thread, |
---|
| 694 | boolean force |
---|
| 695 | ); |
---|
| 696 | |
---|
[baff4da] | 697 | /** |
---|
[eb02f47] | 698 | * This routine evaluates the current scheduling information for the |
---|
[a0ed4ed] | 699 | * system and determines if a context switch is required. This |
---|
[eb02f47] | 700 | * is usually called after changing an execution mode such as preemptability |
---|
| 701 | * for a thread. |
---|
[ac7d5ef0] | 702 | */ |
---|
[3a4ae6c] | 703 | boolean _Thread_Evaluate_mode( void ); |
---|
[ac7d5ef0] | 704 | |
---|
[baff4da] | 705 | #if (CPU_PROVIDES_IDLE_THREAD_BODY == FALSE) |
---|
| 706 | /** |
---|
[adf98bd] | 707 | * This routine is the body of the system idle thread. |
---|
| 708 | */ |
---|
| 709 | Thread _Thread_Idle_body( |
---|
[d6154c7] | 710 | uint32_t ignored |
---|
[adf98bd] | 711 | ); |
---|
| 712 | #endif |
---|
| 713 | |
---|
[6a07436] | 714 | /** This defines the type for a method which operates on a single thread. |
---|
[17c66867] | 715 | */ |
---|
| 716 | typedef void (*rtems_per_thread_routine)( Thread_Control * ); |
---|
| 717 | |
---|
[baff4da] | 718 | /** |
---|
| 719 | * This routine iterates over all threads regardless of API and |
---|
| 720 | * invokes the specified routine. |
---|
| 721 | */ |
---|
[17c66867] | 722 | void rtems_iterate_over_all_threads( |
---|
| 723 | rtems_per_thread_routine routine |
---|
| 724 | ); |
---|
| 725 | |
---|
[1a8fde6c] | 726 | #ifndef __RTEMS_APPLICATION__ |
---|
[5e9b32b] | 727 | #include <rtems/score/thread.inl> |
---|
[1a8fde6c] | 728 | #endif |
---|
[97e2729d] | 729 | #if defined(RTEMS_MULTIPROCESSING) |
---|
[5e9b32b] | 730 | #include <rtems/score/threadmp.h> |
---|
[97e2729d] | 731 | #endif |
---|
[ac7d5ef0] | 732 | |
---|
| 733 | #ifdef __cplusplus |
---|
| 734 | } |
---|
| 735 | #endif |
---|
| 736 | |
---|
[baff4da] | 737 | /**@}*/ |
---|
| 738 | |
---|
[ac7d5ef0] | 739 | #endif |
---|
| 740 | /* end of include file */ |
---|