On 31 Aug 2015, at 18:57 , Raymond Jennings <shentino@gmail.com> wrote:

Is there an easy way for one task to share address space with another task directly or does it have to go through the kernel/os and be emulated?

there’s nothing stopping you mapping the same frame into two different address spaces (provided you have the rights to do so).

I noticed that support for mapping memory is mostly low level assignment of physical frames to virtual frames via page tables, unlike Mach which uses memory objects.

Yes, a microkernel’s job is to provide low-level abstractions. Mach-style memory objects isn’t one of them. See https://ssrg.nicta.com.au/publications/nictaabstracts/Elphinstone_Heiser_13.abstract.pml for an explanation of the philosophy.

Gernot

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