Re: mp:process-run-function and a blocking foreign call

Tapio Karras <[email protected]> writes:

> To allow other MP process to run during the call, the FFI call needs
> to release the Lisp heap.
>
> Look for the :release-heap keyword of def-foreign-call

Thank you. That did it. I added the ":release-heap :when-ok" arguments
to my def-foreign-call forms and all now works as expected.

> The additional challenge is to allocate all FFI arguments in static
> space, so that they don't get moved by the GC as a result of the
> other MP processes running while the FFI call is in progress.

I'm having a hard time understanding what the consequences are of
using :foreign-static-gc as opposed to the default :foreign
allocation. For now I went through my code and adapted it to accept an
allocation option for passing on to all ff:allocate-fobject
calls. However, I don't understand how to figure out /which/ FFI
arguments actually need to be allocated in static space.

-- 
Steven E. Harris