Hello
Could you please help me?
I do not understand the TaskBasic interface in TinyOS and the post and task
keywords.
interface TaskBasic {
async command error_t postTask();
void event runTask();
}
I red TEP106 and other materials but do not understand it.
There is:
When a component declares a task with the task keyword in nesC, it is
implicitly declaring that it uses an instance of the TaskBasic interface:
the task body is the runTask event. When a component uses the post keyword,
it calls the postTask command.
What is this:the task body is the runTask event ? Does it mean that the
implementation of event contains the body of task?
How is the process to execute a task? The component declare a task with
keyword task so it means it implements the event runTask which body is the
task itself. Then when the componet wants to poset the task it uses the post
keyword so it measn it calls command postTask, which the shceduler component
implements. After that the scheduler according to its policy (so after some
time) calls the runTask() event in the component which call the postTask
command before. And the calling that event means that it goes to execute the
body of that event immediately (it preempt other tasks). Is that right?
And where is the queue? What and when goes into the queue? Does go there the
called event?
And what about this?:
"When TinyOS tells the scheduler to run a task, it pulls the next identifier
off the queue and uses it to dispatch on the parameterized TaskBasic
interface."
I do not understand it.
Where from the process of posting the task are the identifiers put in the
queue? How the scheduler take the identifier from the queue?
And what means that: TinyOS tells the scheduler? How TinyOs "tells" the
scheduler?
Thank you
paul m.
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