[ECOS] Detect if scheduler locked?

[Andrew Lunn]

> Now I've got a customer who is calling this routine with the
> scheduler locked (in order to prevent other tasks from
> attempting to read the flash while it's busy, I presume).

Semaphores/mutexs sound like the correct answer, with multiple read
lockers but one write locker. Classical stuff you learn in university
when doing a CS degree.

    Andrew

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