[ECOS] Periodic activation

[Alois Z.]

> 
> Another alternative is to disable scheduling to protect your data. It
> depends on how long you need to protect it. While the scheduler is
> locked higher priority threads would be blocked from running if they
> become runnable. If you just need to access a couple of items, it is
> not too bad. If you need to walk a long linked list, then you might up
> set your real time operation.
> 
The problem is that I don't want to remove the mutex code as it is needed on other platforms.  So as it looks I have to stay with the thread semaphore solution.

Alois
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