Re: Question about inter-thread stack references

Hi Ivan,


On Thu, 15 Jan 2015 23:54:57 -0800, Ivan Godard <ivan@ootbcomp.com>
wrote:


>If a process has two or more threads running in it, what are the rules
>regarding one thread referencing memory in a different thread's stack?


No rules per se, but it isn't even feasible unless the lifetimes of
the references obey strict stack discipline wrt to the lifetime of the
target. You can find that sort of structure with coroutines and with
map-reduce style parent-child thread relationships - but not in
general.


However, I don't see any compelling reason to permit it. The stack is
nothing more than a compiler managed mark-release heap: it's only real
benefit to the programmer is no-brainer deallocation. Anything that
might usefully be done using stack sharing can be done almost as
easily - and much more safely - using an explicit mark-release heap or
stacked heaps (regions, per Tofte and others).


>Ivan
George

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