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RX4000V4 Datasheet

  • RX4000V4

  • RX4000(uITRON4.0) Basics User＇s Manual | User＇s Manual[02/...

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CHAPTER 4 TASK MANAGEMENT
4.5
Terminating Tasks
Task termination occurs when a task that was activated and executing processing shifts back into the dormant
state. Tasks can be terminated either normally or forcibly, as defined by the service call that terminates the task. Note
that a terminated task鈥檚 priority, wakeup request number, and suspend request number are initialized to the values set
when the task was created.
4.5.1
Normal termination
When a task has completed processing and no longer needs to be subject to scheduling, it issues the service call
ext_tsk or exd_tsk and self-terminates. Task termination via ext_tsk or exd_tsk is commonly known as normal
termination. Note that ext_tsk effects termination only, whereas exd_tsk both terminates and deletes the task. If the
task is locking any mutexes, these locks are released when the task terminates.
4.5.2
Forcible termination
If necessary, a task can be urgently terminated by issuing the service call ter_tsk. A task that receives this service
call shifts into the dormant state and terminates, regardless of the state it was in at that time. This processing is
known as forcible termination.
If the task is locking any mutexes, these locks are released when the task is forcibly terminated.
4.5.3 Reactivating terminated tasks
In
碌
ITRON4.0, the activation request for a task can be retained, and that task can be reactivated as soon as it
terminates (whether normally or forcibly). In other words, the task is shifted immediately from the dormant state back
to the ready state upon termination.
Note, however, that the activation request for a task that was terminated by exd_tsk is ignored, and the task is
shifted to the non-existent state.
User鈥檚 Manual U14833EJ2V0UM
35

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