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| 型號(hào)： | RX78K4 |
| 英文描述： | 78K/IV Series Real-Time OS Fundamental | User＇s Manual[01/1997] |
| 中文描述： | 78K/IV系列實(shí)時(shí)操作系統(tǒng)的基本|用戶(hù)手冊(cè)[01/1997] |
| 文件頁(yè)數(shù)： | 33/96頁(yè) |
| 文件大?。?/td> | 265K |
| 代理商： | RX78K4 |
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CHAPTER 3 RX78K/IV BASIC OPERATIONS AND CONTROL BLOCKS
24
3.1.2
Configuration of ready queue and dispatching
When RX78K/IV passes CPU execution privilege to a task, it searches for a task having the highest priority in the
READY state. At this time, RX78K/IV references a ready queue.
RX78K/IV has 16 ready queues each corresponding to 16 priority levels (0 to 15). The task chained to the head of
a ready queue has the highest priority of the tasks in the queue, and the task chained to the tail of the queue has the
lowest priority. Among these priority levels, levels 2 to 15 can be specified for a task.
RX78K/IV searches the ready queues from the one having the highest priority for a task to be placed in the RUN
state. However, if there is no executable user task at that time, it sets the CPU in the HALT mode. To resume
execution of a user task, therefore, an interrupt must be used. The stack area at that time becomes the user stack
area.
Fig. 3-3 shows the configuration of the ready queue.
Fig. 3-3 Ready Queue Configuration
Ready queue
TOP
LAST
TCB1
Queue area
Information
particular
to the task
TCB2
Queue area
Information
particular
to the task
TCBn
Queue area
Information
particular
to the task
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