[ac7d5ef0] | 1 | /* thread.h |
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| 2 | * |
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| 3 | * This include file contains all constants and structures associated |
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| 4 | * with the thread control block. |
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| 5 | * |
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| 6 | * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. |
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| 7 | * On-Line Applications Research Corporation (OAR). |
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| 8 | * All rights assigned to U.S. Government, 1994. |
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| 9 | * |
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| 10 | * This material may be reproduced by or for the U.S. Government pursuant |
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| 11 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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| 12 | * notice must appear in all copies of this file and its derivatives. |
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| 13 | * |
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| 14 | * $Id$ |
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| 15 | */ |
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| 16 | |
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| 17 | #ifndef __RTEMS_THREAD_h |
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| 18 | #define __RTEMS_THREAD_h |
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| 19 | |
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| 20 | #ifdef __cplusplus |
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| 21 | extern "C" { |
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| 22 | #endif |
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| 23 | |
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| 24 | #include <rtems/asr.h> |
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| 25 | #include <rtems/attr.h> |
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| 26 | #include <rtems/context.h> |
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| 27 | #include <rtems/cpu.h> |
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| 28 | #include <rtems/eventset.h> |
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| 29 | #include <rtems/modes.h> |
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| 30 | #include <rtems/mppkt.h> |
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| 31 | #include <rtems/object.h> |
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| 32 | #include <rtems/options.h> |
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| 33 | #include <rtems/priority.h> |
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| 34 | #include <rtems/stack.h> |
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| 35 | #include <rtems/states.h> |
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| 36 | #include <rtems/tod.h> |
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| 37 | #include <rtems/tqdata.h> |
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| 38 | #include <rtems/watchdog.h> |
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| 39 | |
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| 40 | /* |
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| 41 | * Notepads constants (indices into notepad array) |
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| 42 | */ |
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| 43 | |
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| 44 | #define RTEMS_NOTEPAD_FIRST 0 /* lowest numbered notepad */ |
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| 45 | #define RTEMS_NOTEPAD_0 0 /* notepad location 0 */ |
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| 46 | #define RTEMS_NOTEPAD_1 1 /* notepad location 1 */ |
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| 47 | #define RTEMS_NOTEPAD_2 2 /* notepad location 2 */ |
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| 48 | #define RTEMS_NOTEPAD_3 3 /* notepad location 3 */ |
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| 49 | #define RTEMS_NOTEPAD_4 4 /* notepad location 4 */ |
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| 50 | #define RTEMS_NOTEPAD_5 5 /* notepad location 5 */ |
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| 51 | #define RTEMS_NOTEPAD_6 6 /* notepad location 6 */ |
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| 52 | #define RTEMS_NOTEPAD_7 7 /* notepad location 7 */ |
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| 53 | #define RTEMS_NOTEPAD_8 8 /* notepad location 8 */ |
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| 54 | #define RTEMS_NOTEPAD_9 9 /* notepad location 9 */ |
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| 55 | #define RTEMS_NOTEPAD_10 10 /* notepad location 10 */ |
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| 56 | #define RTEMS_NOTEPAD_11 11 /* notepad location 11 */ |
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| 57 | #define RTEMS_NOTEPAD_12 12 /* notepad location 12 */ |
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| 58 | #define RTEMS_NOTEPAD_13 13 /* notepad location 13 */ |
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| 59 | #define RTEMS_NOTEPAD_14 14 /* notepad location 14 */ |
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| 60 | #define RTEMS_NOTEPAD_15 15 /* notepad location 15 */ |
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| 61 | #define RTEMS_NOTEPAD_LAST RTEMS_NOTEPAD_15 /* highest numbered notepad */ |
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| 62 | |
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[4d9fa26] | 63 | #define RTEMS_NUMBER_NOTEPADS (RTEMS_NOTEPAD_LAST+1) |
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| 64 | |
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[ac7d5ef0] | 65 | /* |
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| 66 | * The following defines the "return type" of an RTEMS thread. |
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| 67 | * |
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| 68 | * NOTE: Keep both types for internal threads. |
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| 69 | */ |
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| 70 | |
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| 71 | typedef void rtems_task; |
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| 72 | typedef void Thread; |
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| 73 | |
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| 74 | /* |
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| 75 | * The following defines the argument to an RTEMS thread. |
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| 76 | */ |
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| 77 | |
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| 78 | typedef unsigned32 rtems_task_argument; |
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| 79 | typedef unsigned32 Thread_Argument; |
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| 80 | |
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| 81 | /* |
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| 82 | * The following defines the type for the entry point of an RTEMS thread. |
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| 83 | */ |
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| 84 | |
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| 85 | typedef rtems_task ( *rtems_task_entry )( |
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| 86 | rtems_task_argument |
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| 87 | ); |
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| 88 | |
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| 89 | typedef Thread ( *Thread_Entry )( |
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| 90 | Thread_Argument |
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| 91 | ); |
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| 92 | |
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| 93 | /* |
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| 94 | * The following structure contains the information which defines |
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| 95 | * the starting state of a thread. |
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| 96 | */ |
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| 97 | |
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| 98 | typedef struct { |
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| 99 | Thread_Entry entry_point; /* starting thread address */ |
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| 100 | unsigned32 initial_argument; /* initial argument */ |
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| 101 | rtems_mode initial_modes; /* initial mode */ |
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| 102 | rtems_task_priority initial_priority; /* initial priority */ |
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| 103 | void *fp_context; /* initial FP context area address */ |
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| 104 | Stack_Control Initial_stack; /* stack information */ |
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| 105 | } Thread_Start_information; |
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| 106 | |
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| 107 | /* |
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| 108 | * The following structure contains the information necessary to manage |
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| 109 | * a thread which it is waiting for a resource. |
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| 110 | */ |
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| 111 | |
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| 112 | typedef struct { |
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| 113 | Objects_Id id; /* waiting on this object */ |
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| 114 | rtems_option option_set; /* wait mode */ |
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| 115 | union { |
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| 116 | unsigned32 segment_size; /* size of segment requested */ |
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| 117 | rtems_event_set event_condition; |
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| 118 | } Extra; |
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| 119 | void *return_argument; /* address of user return param */ |
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| 120 | rtems_status_code return_code; /* status for thread awakened */ |
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| 121 | Chain_Control Block2n; /* 2 - n priority blocked chain */ |
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| 122 | Thread_queue_Control *queue; /* pointer to thread queue */ |
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| 123 | } Thread_Wait_information; |
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| 124 | |
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| 125 | /* |
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| 126 | * The following defines the control block used to manage |
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| 127 | * each thread proxy. |
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| 128 | * |
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| 129 | * NOTE: It is critical that proxies and threads have identical |
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| 130 | * memory images for the shared part. |
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| 131 | */ |
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| 132 | |
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| 133 | typedef struct { |
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| 134 | Objects_Control Object; |
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| 135 | Objects_Name name; |
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| 136 | States_Control current_state; |
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| 137 | rtems_task_priority current_priority; |
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| 138 | rtems_task_priority real_priority; |
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| 139 | unsigned32 resource_count; |
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| 140 | Thread_Wait_information Wait; |
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| 141 | Watchdog_Control Timer; |
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| 142 | rtems_packet_prefix *receive_packet; |
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| 143 | /****************** end of common block ********************/ |
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| 144 | Chain_Node Active; |
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| 145 | } Thread_Proxy_control; |
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| 146 | |
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| 147 | |
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| 148 | /* |
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| 149 | * The following record defines the control block used |
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| 150 | * to manage each thread. |
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| 151 | * |
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| 152 | * NOTE: It is critical that proxies and threads have identical |
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| 153 | * memory images for the shared part. |
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| 154 | */ |
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| 155 | |
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| 156 | typedef struct { |
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| 157 | Objects_Control Object; |
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| 158 | Objects_Name name; |
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| 159 | States_Control current_state; |
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[4d9fa26] | 160 | rtems_task_priority current_priority; |
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| 161 | rtems_task_priority real_priority; |
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[ac7d5ef0] | 162 | unsigned32 resource_count; |
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| 163 | Thread_Wait_information Wait; |
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| 164 | Watchdog_Control Timer; |
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[4d9fa26] | 165 | rtems_packet_prefix *receive_packet; |
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[ac7d5ef0] | 166 | /****************** end of common block ********************/ |
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| 167 | Chain_Control *ready; |
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| 168 | Priority_Information Priority_map; |
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[4d9fa26] | 169 | rtems_event_set pending_events; |
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| 170 | rtems_event_set events_out; |
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[ac7d5ef0] | 171 | Thread_Start_information Start; |
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| 172 | ASR_Information Signal; |
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[4d9fa26] | 173 | rtems_mode current_modes; |
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| 174 | rtems_attribute attribute_set; |
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[ac7d5ef0] | 175 | Context_Control Registers; |
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| 176 | void *fp_context; |
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[4d9fa26] | 177 | unsigned32 Notepads[ RTEMS_NUMBER_NOTEPADS ]; |
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[ac7d5ef0] | 178 | void *extension; |
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| 179 | } Thread_Control; |
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| 180 | |
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| 181 | /* |
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| 182 | * External API name for Thread_Control |
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| 183 | */ |
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| 184 | |
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| 185 | typedef Thread_Control rtems_tcb; |
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| 186 | |
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| 187 | /* |
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| 188 | * The following declares the dispatch critical section nesting |
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| 189 | * counter which is used to prevent context switches at inopportune |
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| 190 | * moments. |
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| 191 | */ |
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| 192 | |
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| 193 | EXTERN unsigned32 _Thread_Dispatch_disable_level; |
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| 194 | |
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| 195 | /* |
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| 196 | * The following data items are used to manage timeslicing. |
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| 197 | */ |
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| 198 | |
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| 199 | EXTERN unsigned32 _Thread_Ticks_remaining_in_timeslice; |
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| 200 | EXTERN unsigned32 _Thread_Ticks_per_timeslice; |
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| 201 | |
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| 202 | /* |
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| 203 | * The following points to the array of FIFOs used to manage the |
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| 204 | * set of ready threads. |
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| 205 | */ |
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| 206 | |
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| 207 | EXTERN Chain_Control *_Thread_Ready_chain; |
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| 208 | |
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| 209 | /* |
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| 210 | * The following points to the thread which is currently executing. |
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| 211 | * This thread is implicitly manipulated by numerous directives. |
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| 212 | */ |
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| 213 | |
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| 214 | EXTERN Thread_Control *_Thread_Executing; |
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| 215 | |
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| 216 | /* |
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| 217 | * The following points to the highest priority ready thread |
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| 218 | * in the system. Unless the current thread is RTEMS_NO_PREEMPT, |
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| 219 | * then this thread will be context switched to when the next |
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| 220 | * dispatch occurs. |
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| 221 | */ |
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| 222 | |
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| 223 | EXTERN Thread_Control *_Thread_Heir; |
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| 224 | |
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| 225 | /* |
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| 226 | * The following points to the thread whose floating point |
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| 227 | * context is currently loaded. |
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| 228 | */ |
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| 229 | |
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| 230 | EXTERN Thread_Control *_Thread_Allocated_fp; |
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| 231 | |
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| 232 | /* |
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| 233 | * The following defines the information control block used to |
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| 234 | * manage this class of objects. |
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| 235 | */ |
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| 236 | |
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| 237 | EXTERN Objects_Information _Thread_Information; |
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| 238 | |
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| 239 | /* |
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| 240 | * The following context area contains the context of the "thread" |
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| 241 | * which invoked rtems_initialize_executive. This context is restored |
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| 242 | * as the last action of the rtems_shutdown_executive directive. Thus |
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| 243 | * control of the processor can be returned to the environment |
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| 244 | * which initiated RTEMS. |
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| 245 | */ |
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| 246 | |
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| 247 | EXTERN Context_Control _Thread_BSP_context; |
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| 248 | |
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| 249 | /* |
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| 250 | * _Thread_Handler_initialization |
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| 251 | * |
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| 252 | * DESCRIPTION: |
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| 253 | * |
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| 254 | * This routine performs the initialization necessary for this handler. |
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| 255 | */ |
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| 256 | |
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| 257 | void _Thread_Handler_initialization ( |
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| 258 | unsigned32 maximum_tasks, |
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| 259 | unsigned32 ticks_per_timeslice, |
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| 260 | unsigned32 maximum_proxies |
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| 261 | ); |
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| 262 | |
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| 263 | /* |
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| 264 | * _Thread_Start_multitasking |
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| 265 | * |
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| 266 | * DESCRIPTION: |
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| 267 | * |
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| 268 | * This routine initiates multitasking. It is invoked only as |
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| 269 | * part of initialization and its invocation is the last act of |
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| 270 | * the rtems_initialize_executive directive. |
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| 271 | */ |
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| 272 | |
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| 273 | void _Thread_Start_multitasking ( |
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| 274 | Thread_Control *system_thread, |
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| 275 | Thread_Control *idle_thread |
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| 276 | ); |
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| 277 | |
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| 278 | /* |
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| 279 | * _Thread_Stop_multitasking |
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| 280 | * |
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| 281 | * DESCRIPTION: |
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| 282 | * |
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| 283 | * This routine halts multitasking and returns control to |
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| 284 | * the "thread" which initially invoked the rtems_initialize_executive |
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| 285 | * directive. |
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| 286 | */ |
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| 287 | |
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| 288 | STATIC INLINE void _Thread_Stop_multitasking( void ); |
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| 289 | |
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| 290 | /* |
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| 291 | * _Thread_Dispatch_initialization |
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| 292 | * |
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| 293 | * DESCRIPTION: |
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| 294 | * |
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| 295 | * This routine initializes the thread dispatching subsystem. |
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| 296 | */ |
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| 297 | |
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| 298 | STATIC INLINE void _Thread_Dispatch_initialization( void ); |
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| 299 | |
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| 300 | /* |
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| 301 | * _Thread_Dispatch |
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| 302 | * |
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| 303 | * DESCRIPTION: |
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| 304 | * |
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| 305 | * This routine is responsible for transferring control of the |
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| 306 | * processor from the executing thread to the heir thread. As part |
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| 307 | * of this process, it is responsible for the following actions: |
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| 308 | * |
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| 309 | * + saving the context of the executing thread |
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| 310 | * + restoring the context of the heir thread |
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| 311 | * + dispatching any signals for the resulting executing thread |
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| 312 | */ |
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| 313 | |
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| 314 | void _Thread_Dispatch( void ); |
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| 315 | |
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| 316 | /* |
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| 317 | * _Thread_Ready |
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| 318 | * |
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| 319 | * DESCRIPTION: |
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| 320 | * |
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| 321 | * This routine removes any set states for the_thread. It performs |
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| 322 | * any necessary scheduling operations including the selection of |
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| 323 | * a new heir thread. |
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| 324 | */ |
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| 325 | |
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| 326 | void _Thread_Ready( |
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| 327 | Thread_Control *the_thread |
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| 328 | ); |
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| 329 | |
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| 330 | /* |
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| 331 | * _Thread_Clear_state |
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| 332 | * |
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| 333 | * DESCRIPTION: |
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| 334 | * |
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| 335 | * This routine clears the indicated STATES for the_thread. It performs |
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| 336 | * any necessary scheduling operations including the selection of |
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| 337 | * a new heir thread. |
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| 338 | */ |
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| 339 | |
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| 340 | void _Thread_Clear_state( |
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| 341 | Thread_Control *the_thread, |
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| 342 | States_Control state |
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| 343 | ); |
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| 344 | |
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| 345 | /* |
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| 346 | * _Thread_Set_state |
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| 347 | * |
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| 348 | * DESCRIPTION: |
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| 349 | * |
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| 350 | * This routine sets the indicated states for the_thread. It performs |
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| 351 | * any necessary scheduling operations including the selection of |
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| 352 | * a new heir thread. |
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| 353 | * |
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| 354 | */ |
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| 355 | |
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| 356 | void _Thread_Set_state( |
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| 357 | Thread_Control *the_thread, |
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| 358 | States_Control state |
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| 359 | ); |
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| 360 | |
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| 361 | /* |
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| 362 | * _Thread_Set_transient |
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| 363 | * |
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| 364 | * DESCRIPTION: |
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| 365 | * |
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| 366 | * This routine sets the TRANSIENT state for the_thread. It performs |
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| 367 | * any necessary scheduling operations including the selection of |
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| 368 | * a new heir thread. |
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| 369 | */ |
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| 370 | |
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| 371 | void _Thread_Set_transient( |
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| 372 | Thread_Control *the_thread |
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| 373 | ); |
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| 374 | |
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| 375 | /* |
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| 376 | * _Thread_Reset_timeslice |
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| 377 | * |
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| 378 | * DESCRIPTION: |
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| 379 | * |
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| 380 | * This routine is invoked upon expiration of the currently |
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| 381 | * executing thread's timeslice. If no other thread's are ready |
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| 382 | * at the priority of the currently executing thread, then the |
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| 383 | * executing thread's timeslice is reset. Otherwise, the |
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| 384 | * currently executing thread is placed at the rear of the |
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| 385 | * RTEMS_FIFO for this priority and a new heir is selected. |
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| 386 | */ |
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| 387 | |
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| 388 | void _Thread_Reset_timeslice( void ); |
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| 389 | |
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| 390 | /* |
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| 391 | * _Thread_Tickle_timeslice |
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| 392 | * |
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| 393 | * DESCRIPTION: |
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| 394 | * |
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| 395 | * This routine is invoked as part of processing each clock tick. |
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| 396 | * It is responsible for determining if the current thread allows |
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| 397 | * timeslicing and, if so, when its timeslice expires. |
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| 398 | */ |
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| 399 | |
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| 400 | void _Thread_Tickle_timeslice( void ); |
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| 401 | |
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| 402 | /* |
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| 403 | * _Thread_Yield_processor |
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| 404 | * |
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| 405 | * DESCRIPTION: |
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| 406 | * |
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| 407 | * This routine is invoked when a thread wishes to voluntarily |
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| 408 | * transfer control of the processor to another thread of equal |
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| 409 | * or greater priority. |
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| 410 | */ |
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| 411 | |
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| 412 | void _Thread_Yield_processor( void ); |
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| 413 | |
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| 414 | /* |
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| 415 | * _Thread_Is_executing |
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| 416 | * |
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| 417 | * DESCRIPTION: |
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| 418 | * |
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| 419 | * This function returns TRUE if the_thread is the currently executing |
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| 420 | * thread, and FALSE otherwise. |
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| 421 | */ |
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| 422 | |
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| 423 | STATIC INLINE boolean _Thread_Is_executing ( |
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| 424 | Thread_Control *the_thread |
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| 425 | ); |
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| 426 | |
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| 427 | /* |
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| 428 | * _Thread_Is_heir |
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| 429 | * |
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| 430 | * DESCRIPTION: |
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| 431 | * |
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| 432 | * This function returns TRUE if the_thread is the heir |
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| 433 | * thread, and FALSE otherwise. |
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| 434 | */ |
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| 435 | |
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| 436 | STATIC INLINE boolean _Thread_Is_executing ( |
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| 437 | Thread_Control *the_thread |
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| 438 | ); |
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| 439 | |
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| 440 | /* |
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| 441 | * _Thread_Is_executing_also_the_heir |
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| 442 | * |
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| 443 | * DESCRIPTION: |
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| 444 | * |
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| 445 | * This function returns TRUE if the currently executing thread |
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| 446 | * is also the heir thread, and FALSE otherwise. |
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| 447 | */ |
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| 448 | |
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| 449 | STATIC INLINE boolean _Thread_Is_executing_also_the_heir( void ); |
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| 450 | |
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| 451 | /* |
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| 452 | * _Thread_Load_environment |
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| 453 | * |
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| 454 | * DESCRIPTION: |
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| 455 | * |
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| 456 | * This routine initializes the context of the_thread to its |
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| 457 | * appropriate starting state. |
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| 458 | */ |
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| 459 | |
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| 460 | void _Thread_Load_environment( |
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| 461 | Thread_Control *the_thread |
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| 462 | ); |
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| 463 | |
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| 464 | /* |
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| 465 | * _Thread_Handler |
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| 466 | * |
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| 467 | * DESCRIPTION: |
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| 468 | * |
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| 469 | * This routine is the wrapper function for all threads. It is |
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| 470 | * the starting point for all threads. The user provided thread |
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| 471 | * entry point is invoked by this routine. Operations |
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| 472 | * which must be performed immediately before and after the user's |
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| 473 | * thread executes are found here. |
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| 474 | */ |
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| 475 | |
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| 476 | void _Thread_Handler( void ); |
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| 477 | |
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| 478 | /* |
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| 479 | * _Thread_Delay_ended |
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| 480 | * |
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| 481 | * DESCRIPTION: |
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| 482 | * |
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| 483 | * This routine is invoked when a thread must be unblocked at the |
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| 484 | * end of a delay such as the rtems_task_wake_after and rtems_task_wake_when |
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| 485 | * directives. |
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| 486 | */ |
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| 487 | |
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| 488 | void _Thread_Delay_ended( |
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| 489 | Objects_Id id, |
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| 490 | void *ignored |
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| 491 | ); |
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| 492 | |
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| 493 | /* |
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| 494 | * _Thread_Change_priority |
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| 495 | * |
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| 496 | * DESCRIPTION: |
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| 497 | * |
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| 498 | * This routine changes the current priority of the_thread to |
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| 499 | * new_priority. It performs any necessary scheduling operations |
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| 500 | * including the selection of a new heir thread. |
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| 501 | */ |
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| 502 | |
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| 503 | void _Thread_Change_priority ( |
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| 504 | Thread_Control *the_thread, |
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| 505 | rtems_task_priority new_priority |
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| 506 | ); |
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| 507 | |
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| 508 | /* |
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| 509 | * _Thread_Set_priority |
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| 510 | * |
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| 511 | * DESCRIPTION: |
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| 512 | * |
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| 513 | * This routine updates the priority related fields in the_thread |
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| 514 | * control block to indicate the current priority is now new_priority. |
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| 515 | */ |
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| 516 | |
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| 517 | void _Thread_Set_priority( |
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| 518 | Thread_Control *the_thread, |
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| 519 | rtems_task_priority new_priority |
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| 520 | ); |
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| 521 | |
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| 522 | /* |
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| 523 | * _Thread_Change_mode |
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| 524 | * |
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| 525 | * DESCRIPTION: |
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| 526 | * |
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| 527 | * This routine changes the current values of the modes |
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| 528 | * indicated by mask of the calling thread are changed to that |
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| 529 | * indicated in mode_set. The former mode of the thread is |
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| 530 | * returned in mode_set. If the changes in the current mode |
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| 531 | * indicate that a thread dispatch operation may be necessary, |
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| 532 | * then need_dispatch is TRUE, otherwise it is FALSE. |
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| 533 | */ |
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| 534 | |
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| 535 | boolean _Thread_Change_mode( |
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| 536 | rtems_mode new_mode_set, |
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| 537 | rtems_mode mask, |
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| 538 | rtems_mode *old_mode_set |
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| 539 | ); |
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| 540 | |
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| 541 | /* |
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| 542 | * _Thread_Resume |
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| 543 | * |
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| 544 | * DESCRIPTION: |
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| 545 | * |
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| 546 | * This routine clears the SUSPENDED state for the_thread. It performs |
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| 547 | * any necessary scheduling operations including the selection of |
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| 548 | * a new heir thread. |
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| 549 | */ |
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| 550 | |
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| 551 | STATIC INLINE void _Thread_Resume ( |
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| 552 | Thread_Control *the_thread |
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| 553 | ); |
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| 554 | |
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| 555 | /* |
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| 556 | * _Thread_Unblock |
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| 557 | * |
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| 558 | * DESCRIPTION: |
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| 559 | * |
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| 560 | * This routine clears any blocking state for the_thread. It performs |
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| 561 | * any necessary scheduling operations including the selection of |
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| 562 | * a new heir thread. |
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| 563 | */ |
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| 564 | |
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| 565 | STATIC INLINE void _Thread_Unblock ( |
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| 566 | Thread_Control *the_thread |
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| 567 | ); |
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| 568 | |
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| 569 | /* |
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| 570 | * _Thread_Restart_self |
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| 571 | * |
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| 572 | * DESCRIPTION: |
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| 573 | * |
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| 574 | * This routine resets the current context of the calling thread |
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| 575 | * to that of its initial state. |
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| 576 | */ |
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| 577 | |
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| 578 | STATIC INLINE void _Thread_Restart_self( void ); |
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| 579 | |
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| 580 | /* |
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| 581 | * _Thread_Calculate_heir |
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| 582 | * |
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| 583 | * DESCRIPTION: |
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| 584 | * |
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| 585 | * This function returns a pointer to the highest priority |
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| 586 | * ready thread. |
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| 587 | */ |
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| 588 | |
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| 589 | STATIC INLINE void _Thread_Calculate_heir( void ); |
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| 590 | |
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| 591 | /* |
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| 592 | * _Thread_Is_allocated_fp |
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| 593 | * |
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| 594 | * DESCRIPTION: |
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| 595 | * |
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| 596 | * This function returns TRUE if the floating point context of |
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| 597 | * the_thread is currently loaded in the floating point unit, and |
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| 598 | * FALSE otherwise. |
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| 599 | */ |
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| 600 | |
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| 601 | STATIC INLINE boolean _Thread_Is_allocated_fp ( |
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| 602 | Thread_Control *the_thread |
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| 603 | ); |
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| 604 | |
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| 605 | /* |
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| 606 | * _Thread_Deallocate_fp |
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| 607 | * |
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| 608 | * DESCRIPTION: |
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| 609 | * |
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| 610 | * This routine is invoked when the currently loaded floating |
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| 611 | * point context is now longer associated with an active thread. |
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| 612 | */ |
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| 613 | |
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| 614 | STATIC INLINE void _Thread_Deallocate_fp( void ); |
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| 615 | |
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| 616 | /* |
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| 617 | * _Thread_Disable_dispatch |
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| 618 | * |
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| 619 | * DESCRIPTION: |
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| 620 | * |
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| 621 | * This routine prevents dispatching. |
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| 622 | */ |
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| 623 | |
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| 624 | STATIC INLINE void _Thread_Disable_dispatch( void ); |
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| 625 | |
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| 626 | /* |
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| 627 | * _Thread_Enable_dispatch |
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| 628 | * |
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| 629 | * DESCRIPTION: |
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| 630 | * |
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| 631 | * This routine allows dispatching to occur again. If this is |
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| 632 | * the outer most dispatching critical section, then a dispatching |
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| 633 | * operation will be performed and, if necessary, control of the |
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| 634 | * processor will be transferred to the heir thread. |
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| 635 | */ |
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| 636 | |
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| 637 | #if ( CPU_INLINE_ENABLE_DISPATCH == TRUE ) |
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| 638 | |
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| 639 | STATIC INLINE void _Thread_Enable_dispatch(); |
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| 640 | |
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| 641 | #endif |
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| 642 | |
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| 643 | #if ( CPU_INLINE_ENABLE_DISPATCH == FALSE ) |
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| 644 | |
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| 645 | void _Thread_Enable_dispatch( void ); |
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| 646 | |
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| 647 | #endif |
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| 648 | |
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| 649 | /* |
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| 650 | * _Thread_Unnest_dispatch |
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| 651 | * |
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| 652 | * DESCRIPTION: |
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| 653 | * |
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| 654 | * This routine allows dispatching to occur again. However, |
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| 655 | * no dispatching operation is performed even if this is the outer |
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| 656 | * most dispatching critical section. |
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| 657 | */ |
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| 658 | |
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| 659 | STATIC INLINE void _Thread_Unnest_dispatch( void ); |
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| 660 | |
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| 661 | /* |
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| 662 | * _Thread_Is_dispatching_enabled |
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| 663 | * |
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| 664 | * DESCRIPTION: |
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| 665 | * |
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| 666 | * This function returns TRUE if dispatching is disabled, and FALSE |
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| 667 | * otherwise. |
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| 668 | */ |
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| 669 | |
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| 670 | STATIC INLINE boolean _Thread_Is_dispatching_enabled( void ); |
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| 671 | |
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| 672 | /* |
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| 673 | * _Thread_Is_context_switch_necessary |
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| 674 | * |
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| 675 | * DESCRIPTION: |
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| 676 | * |
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| 677 | * This function returns TRUE if dispatching is disabled, and FALSE |
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| 678 | * otherwise. |
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| 679 | */ |
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| 680 | |
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| 681 | STATIC INLINE boolean _Thread_Is_context_switch_necessary( void ); |
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| 682 | |
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| 683 | /* |
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| 684 | * _Thread_Is_null |
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| 685 | * |
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| 686 | * DESCRIPTION: |
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| 687 | * |
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| 688 | * This function returns TRUE if the_thread is NULL and FALSE otherwise. |
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| 689 | */ |
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| 690 | |
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| 691 | STATIC INLINE boolean _Thread_Is_null ( |
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| 692 | Thread_Control *the_thread |
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| 693 | ); |
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| 694 | |
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| 695 | /* |
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| 696 | * _Thread_Get |
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| 697 | * |
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| 698 | * DESCRIPTION: |
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| 699 | * |
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| 700 | * This function maps thread IDs to thread control |
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| 701 | * blocks. If ID corresponds to a local thread, then it |
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| 702 | * returns the_thread control pointer which maps to ID |
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| 703 | * and location is set to OBJECTS_LOCAL. If the thread ID is |
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| 704 | * global and resides on a remote node, then location is set |
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| 705 | * to OBJECTS_REMOTE, and the_thread is undefined. |
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| 706 | * Otherwise, location is set to OBJECTS_ERROR and |
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| 707 | * the_thread is undefined. |
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| 708 | */ |
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| 709 | |
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| 710 | STATIC INLINE Thread_Control *_Thread_Get ( |
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| 711 | Objects_Id id, |
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| 712 | Objects_Locations *location |
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| 713 | ); |
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| 714 | |
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| 715 | #include <rtems/thread.inl> |
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| 716 | #include <rtems/threadmp.h> |
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| 717 | |
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| 718 | #ifdef __cplusplus |
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| 719 | } |
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| 720 | #endif |
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| 721 | |
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| 722 | #endif |
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| 723 | /* end of include file */ |
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