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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)： | 22/96頁 |
| 文件大?。?/td> | 265K |
| 代理商： | RX78K4 |
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CHAPTER 2 BASIC FUNCTIONS OF RX78K/IV
13
2.3.1
Event flag
An event flag is used to make a task wait. Since an event flag is a 1-bit flag, it is not ORed or ANDed with the
other flags.
A task issues system call “wai_flg”, “cwai_flg” or “pol_flg”, “cpol_flg” to wait for an occurrence of an event. If the
event does not occur, the issuing task enters the WAIT state (when wai_flg or cwai_flg is issued). If the task does
not enter the WAIT state, an error code is returned (when pol_flg or cpol_flg is issued).
To inform the occurrence of the event, system call “set_flg” is issued.
The event flag is cleared by system call “clr_flg”.
An event flag can be used to place two or more tasks in the WAIT state. Therefore, the event flag can queue
tasks.
In this case, the tasks are released from the WAIT state when “set_flg” is issued once. If at least one task of the
tasks placed in the WAIT state specifies clearing the flag (cwai_flg), the event flag is cleared after that task has been
released from the WAIT state. Therefore, the tasks following that task are not released from the WAIT state.
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