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| 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)： | 28/96頁 |
| 文件大?。?/td> | 265K |
| 代理商： | RX78K4 |
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CHAPTER 2 BASIC FUNCTIONS OF RX78K/IV
19
2.6
Time management
Time management refers to delayed wake up of tasks and the running of cyclic handlers.
Delayed wake up tasks means performing wake up processing on a task after the elapsing of a specified amount
of time, and is implemented by means of the “wai_task” system call. Running of cyclic handlers means managing the
running of handlers as interrupt processes as specified time intervals, and is implemented by means of the
“act_cyc(iact_cyc)” system call.
In RX78K/IV, one of the CPU’s 16-bit timer/counter units is used as the interval timer. By allocating vector table of
the timer dispatch routine provided by the OS to this timer (tmdsp), this routine can be periodically run. In the timer
dispatch routine, the waiting time of a task that has issued the (wai_tsk) system call, or the waiting time of a cyclic
handler is counted down, and when the specified time has elapsed, the task is awakened, or the cyclic handler is run.
Regarding the actual state transition, a task that has issued “wai_tsk” goes from the WAIT state to the READY
state, whereas a cyclic handler is called directly from the timer dispatch routine.
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