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3.4.3 Task Priority and Waiting Queue
In The standard profiles in µITRON 4.0 Specification support two waiting methods for each object. In one method, tasks
are placed in a waiting queue in order of priority (TA_TPRI attribute); in another, tasks are placed in a waiting queue in
order of FIFO (TA_TFIFO).
Figure 3.18 and Figure 3.19 depict the manner in which tasks are placed in a
waiting queue in order of "taskD," "taskC,"
"taskA," and "taskB."
n
Priority 1 Priority 5 Priority 6
taskB
1
ID No.
2
taskA taskC taskD
Priority 9
Figure 3.18 Waiting queue of the TA_TPRI attribute
n
Priority 9 Priority 6 Priority 1
taskC
1
ID No.
2
taskD taskA taskB
Priority 5
Figure 3.19 Waiting queue of the TA_TFIFO attribute
- To our customers 1
- M3T-MR100/4 V.1.00 3
- • Release Note 5
- • Users Manual (PDF file) 5
- Contents 7
- List of Figures 12
- List of Tables 15
- 2. General Information 19
- 2.3 MR100 Features 22
- 3. Introduction to Kernel 23
- Key input 25
- Monitor 26
- Register 28
- Memory map 28
- Register stored 29
- Register not stored 29
- 3.2 Service Call 30
- ID number 36
- Configurator 36
- 3.4 Task 37
- DORMANT 38
- SUSPENDED 38
- Priority 41
- Called the task context 43
- 3.5 System States 44
- 3.6 Regarding Interrupts 47
- • Kernel interrupt handler 47
- 3.7 Stacks 50
- • User Stack 50
- • System Stack 50
- 4. Kernel 51
- 4.1.2 Module Overview 52
- • Terminate Task (ter_tsk) 53
- 0 0 1 2 1 55
- Number of 56
- • Delay task (dly_tsk) 58
- Returned after use 59
- WAIT state 60
- Data Data 63
- Message Message 64
- Message 65
- • Processing speed 68
- • Memory usage efficiency 68
- • Ease of configuration 68
- • Set System Time (set_tim) 71
- Move the end of the queue 74
- Save Registers 75
- Task Selection 75
- 5. Service call reffernce 79
- No. Item Content 100
- - 102 118
- - 105 121
- .blkb 6 123
- : 123
- - 110 126
- - 112 128
- - 115 131
- - 117 133
- - 121 137
- - 124 140
- - 126 142
- - 132 148
- - 134 150
- - 138 154
- - 140 156
- (handler only) 157
- - 142 158
- - 147 163
- - 149 165
- - 152 168
- - 154 170
- - 158 174
- - 161 177
- - 164 180
- - 167 183
- - 173 189
- - 176 192
- - 190 206
- - 193 209
- - 198 214
- - 200 216
- - 202 218
- Overview 221
- - 206 222
- Figure 6.2 Program Example 224
- 6.2.4 System generation 225
- 6.2.5 Writing ROM 226
- 7. Detailed Applications 227
- - 214 230
- 7.2.1 Writing Task 231
- - 217 233
- For examples: 233
- - 219 235
- ; set timer mode 236
- ; set interval count 236
- ; system timer start 236
- - 221 237
- - 222 238
- 7.4 Memory Allocation 240
- • asm_sec.inc 240
- • c_sec.inc 240
- 8. Using Configurator 243
- Symbol 244
- MPU clock 247
- ID No 253
- ID name 253
- Number of data queues 254
- Select message queue 256
- Maximum message priority 256
- ID Name 258
- Section name 258
- Message buffer size 258
- Maximum message size 258
- Start address 261
- Extended information 261
- Vector No 262
- 8.2.1 Configurator Overview 270
- Configuration file name 272
- Error messages 273
- Warning messages 275
- 9.2 Program Source Listing 277
- 9.3 Configuration File 278
- XXX_XXX() 280
- System Stack 281
- Stack Section 281
- Sections used in MR100 282
- User stack size = 282
- Stack growing direction 283
- Σβi( γ) 284
- The necessary system stack 285
- Interrupt 285
- = register to be used 287
- 10.2 Necessary Stack Size 288
- 11. Note 291
- 17. Precautions 292
- 12. Appendix 295
- - 283 299
- - 284 300
- - 285 301
- - 288 304
- REJ10J1523-0100 306
- User’s Manual 306
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