Re: tasklet_kill will always hang for recursive tasklets on a UP

[Werner Almesberger <wa@almesberger.net>]

Nagendra Singh Tomar wrote:
> I fail to understand this. How can we say that its not a bug. If we 
> support recursive tasklets, we should support killing them also. If we can 
> do it why not do it. Is there any reason for that.

It's just a question of how you define "to kill" :-) But the
naming is ambiguous, because people may indeed expect
tasklet_kill to work like kill(2).

Obviously, tasklet_kill could set a flag that prevents a
tasklet from rescheduling itself. But then you'd change
the semantics of tasklet_schedule, and in many cases, you'd
still need some flag to tell you what has happened.

Example: if a tasklet allocates some resources, and frees
them when running the next time, you'd need a flag that
tells the caller(s) of tasklet_kill whether there are
still such resources that need freeing.

The current mechanism makes sure that the tasklet will
execute one last time, if scheduled before tasklet_kill.

- Werner

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 / Werner Almesberger, Buenos Aires, Argentina         wa@almesberger.net /
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