[plt-scheme] Proposal: Async FFI

From: Grant Rettke (grettke at acm.org)
Date: Sat Jul 7 20:15:20 EDT 2007

Anything that means more database drivers sounds good to me.

On 7/7/07, Hans Oesterholt-Dijkema <hdnews at gawab.com> wrote:
> Dear All,
> In my sqld-psql-c driver (see PLaneT) I've used an asynchronous mechanism
> to call pqexec (a synchronous function call for PostgreSQL). I've done this
> to enable scheme threads to run, while processing SQL queries.
> I'd like to add such a mechanism to the FFI. Maybe through PLaneT, but
> eventually I'd like this to be added to the FFI code. This will help greatly
> for using certain libraries through the FFI, where functions can block for
> a long time, e.g. DB2CLI, MySQL. But other C libraries, e.g. for image
> processing can also be thought of.
> My idea is to provide a set of basic C functions, like:
> int f(int)
> void f(int)
> int f(string)
> ...
> The C code for these functions can be generated. These functions do
> the trick that can be reviewed in the sqld-psql-c PLaneT package, in
> a generic way.
> The FFI could be extended with get-ffi-obj/async. To provide calls
> of these asynchronous functions. Of course this variant will have a
> lot of restrictions, but this basic support would be quite good
> already.
> What do you think of this idea?
> Best regards,
> Hans
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