參數(shù)資料
型號: RX78K4
英文描述: 78K/IV Series Real-Time OS Fundamental | User's Manual[01/1997]
中文描述: 78K/IV系列實時操作系統(tǒng)的基本|用戶手冊[01/1997]
文件頁數(shù): 26/96頁
文件大小: 265K
代理商: RX78K4
CHAPTER 2 BASIC FUNCTIONS OF RX78K/IV
17
Fig. 2-3 shows an example where task A has a lower priority than task B.
<1> Task B has issued system call “wai_flg” and is now in the WAIT state.
<2> Task A is under execution (has the highest priority of the tasks in the READY state).
<3> An interrupt occurs while task A is executed, and processing is passed to the interrupt handler.
<4> System call “iset_flg” is issued in the interrupt handler, and task B is waken up.
<5> System call “ret_int” is issued in the interrupt handler.
<6> Because task B has a priority higher than task A, processing is passed to task B.
Fig. 2-3 Example of “ret_int”
Task A (PRI=3)
Interrupt handler
Task B (PRI=2)
<2>
<3>
<5>
<4>
ret_int
iset_flg
(Wakes up task B)
<1> wai_flg
Interrupt
<6>
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