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3.4 Task
This section describes how tasks are managed by MR100.
3.4.1
Task Status
The real-time OS monitors the task status to determine whether or not to execute the tasks.
Figure 3.15 shows the relationship between key input task execution control and task status. When there is a key input, the
key input task must be executed. That is, the key input task is placed in the execution (RUNNING) state. While the system
waits for key input, task execution is not needed. In that situation, the key input task in the WAITING state.
Key input
Task
RUNNIG state
WAITING state
RUNNING state
Waiting for
key input
Key input
processing
Key input
processing
Figure 3.15 Task Status
The MR100 controls the following six different states including the RUNNING and WAITING states.
1. RUNNING
state
2. READY
state
3. WAITING
state
4. SUSPENDED
state
5. WAITING-SUSPENDED
state
6. DORMANT
state
Every task is in one of the above six different states. Figure 3.16 shows task status transition.
