參數(shù)資料
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|用戶手冊(cè)[01/1997]
文件頁數(shù): 17/96頁
文件大?。?/td> 265K
代理商: RX78K4
CHAPTER 2 BASIC FUNCTIONS OF RX78K/IV
8
2.1
Task State
A task can be in any of the following 4 states:
(1) RUN state
In this state, the task is given the privilege to use the CPU and is under execution. Only one task in the RUN
state can exist in the system at a given point of time.
(2) READY state
A task in the state is ready for execution. All the elements to place the task in the RUN state are ready, but the
task in the READY state cannot be executed because a task having the higher priority is currently under
execution.
(3) WAIT state
A task is placed in this state because it has issued a system call to request a resource. A task in this state can
be an event flag waiting for an event, a semaphore waiting for a resource, a mail box waiting for a message, or
waiting for time.
(4) DORMANT state
When resetting RX78K/IV, tasks other than the initial one are in a dormant state. When a task is terminated, it
enters the pause state.
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