On 01/25/2014 08:58 AM, Bill Myers wrote:
Stack management for green tasks has been based in the past first on segmented
stacks and then on standard large stacks.
However, I just realized that there is a third alternative which might well be
better than both of those.
The idea is very simple: a green task would run on a large stack like now, but
when it is descheduled, a memory buffer of the size of its used stack space is
allocated, and its stack data is copied there; when it is rescheduled, the
stack data is copied back to the original address.
That's a really clever idea. There are though a number of situations
where we unsafely read from or write into other task's stacks that would
need to be considered carefully.
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