[Vm-dev] Re: [squeak-dev] re: "callback failed to own the VM"

[Eliot Miranda]

Hi Craig,

On Fri, Oct 9, 2015 at 3:36 AM, Craig Latta <craig at netjam.org> wrote:

>
> > a) write a scratch primitive called e.g. primitiveFakeAForeignCallback
> > which forks (at a higher priority?, or at least does a yield?), and
> > calls the relevant machinery with faked up callback data (so you can
> > avoid all the stuff in thinkProcess which is written in C)
>
>      Which machinery is that? callbackEnter:? I have the simulator and
> reader image going.
>

here's the edited-down guts of thunkEntry, which is what you wasn't to
simulate:

long
thunkEntry(void *thunkp, long *stackp)
{
...

    if ((flags = interpreterProxy->ownVM(0)) < 0) {
        fprintf(stderr,"Warning; callback failed to own the VM\n");
        return -1;
    }

    if (!(returnType = setjmp(vmcc.trampoline))) {
        ...
        interpreterProxy->sendInvokeCallbackContext(&vmcc);
        fprintf(stderr,"Warning; callback failed to invoke\n");
        ...
        interpreterProxy->disownVM(flags);
        return -1;
    }
    ...
    interpreterProxy->disownVM(flags);

    switch (returnType) {

    case retword:   return vmcc.rvs.valword;
    ...

So I expect you want to do something like

    [self ownVM: 0.
     self sendInvokeCallbackContext: fakeVMCallbackContextAddress] forkAt:
Processor activePriority + 1

You could even create a CArray or some such to hold onto the data for the
callback (fakeVMCallbackContextAddress above).



>
> > BTW, this is /monstrously/ cool of you!
>
>      Sure thing!
>
>
> -C
>
> --
> Craig Latta
> netjam.org
> +31 6 2757 7177 (SMS ok)
> + 1 415 287 3547 (no SMS)
>
>
>


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