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3.4.2 Task Priority and Ready Queue
In the kernel, several tasks may simultaneously request to be executed. In such a case, it is necessary to determine which
task the system should execute first. To properly handle this kind of situation, the system organizes the tasks into proper
execution priority and starts execution with a task having the highest priority. To complete task execution quickly, tasks
related to processing operations that need to be performed immediately should be given higher priorities.
The MR100 permits giving the same priority to several tasks. To provide proper control over the READY task execution
order, the kernel generates a task execution queue called "ready queue." The ready queue structure is shown in Figure
3.
17
13
The ready queue is provided and controlled for each priority level. The first task in the ready queue having the
highest priority is placed in the RUNNING state.
14
1
TCB
Priority
2
TCBTCB
TCBTCB
TCB
3
n
Figure 3.17 Ready Queue (Execution Queue)
13
The TCB(task control block is described in the next chapter.)
14
The task in the RUNNING state remains in the ready queue.
- 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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