[rust-dev] Idea: Memcpyed stacks for green tasks

Matthieu Monrocq matthieu.monrocq at gmail.com
Sun Jan 26 04:26:30 PST 2014

On Sun, Jan 26, 2014 at 3:31 AM, Brian Anderson <banderson at mozilla.com>wrote:

> 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.
Would it be possible to statically eliminate this risk by preventing the
promotion of such affected tasks as greenlets ? Or is there today too many
ways to read into a greenlet stack ?

-- Matthieu

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