[Vm-dev] [squeak-dev] Backing a Form with e.g. mmap() or shm

[Eliot Miranda]

On Thu, Jun 23, 2022 at 10:53 AM tim Rowledge <tim at rowledge.org> wrote:

>
> Isn't there already support for external bitmaps/surfaces? I remember
> doing some things that feel related to this with andreas decades ago
>

You're right.  See the SurfacePlugin.  Didn't know it could be used like
this.  Anyone have any pointers to examples, etc?


> > On 2022-06-23, at 10:41 AM, Eliot Miranda <eliot.miranda at gmail.com>
> wrote:
> >
> >
> >
> > On Thu, Jun 23, 2022 at 10:28 AM Tony Garnock-Jones <
> tonyg at leastfixedpoint.com> wrote:
> > On 6/23/22 18:15, Eliot Miranda wrote:
> > > Can you say more about your use case?
> >
> > I've been implementing the X11 protocol in pure Smalltalk and I want to
> > use a little bit of FFI to shmget/shmat and use that to get the pixels
> > over to the X server. At present XPutImage is working but flooding the
> > server with XPutImage seems to run into a rate limit from time to time
> > so it's not very usable. Best to switch to mmap/shm if I can.
> >
> > Technical:
> >
> > So in this use including the header in the first page would be ok?
> Would the mapping be read-only from the perspective of the X server?  Do
> you need shmget to be run via the FFI or would it be OK to invoke it
> implicitly as part of a mapping allocation primitive?  Would it be better
> to create the mapping via the FFI and provide the mapping to the allocation
> primitive? How should the mapping be taken down?
> >
> > Windows folks, how portable is this idea to other OS's, especially
> windows?  (I'm guessing this is a standard facility on most leading OS's).
> So would it be worth evolving towards a cross-platform abstraction?
> >
> > Procedural:
> > Would you be prepared to build the VM to test this?  Perhaps even
> generate it from sources?  To what extent would you be able to collaborate
> with e.g. Tom & myself in implementing this?
> >
> > _,,,^..^,,,_
> > best, Eliot
>
>
> tim
> --
> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
> Strange OpCodes: START: Cancel preceding jobs in queue
>

_,,,^..^,,,_
best, Eliot
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