[gambit-list] FFI & threads

Marc Feeley feeley at IRO.UMontreal.CA
Sun Oct 31 06:43:19 EST 2004

> Hello,
> I don't find a solution how to suspend
> a gambit thread until input is available
> (and/or output is possible) on a
> file descriptor with known number, which
> is opened in non-blocking mode by a
> foreign library. Is there a clean way
> without polling?

You could create a Scheme port from the file descriptor and then use
the normal I/O operations on that.  Here is some (untested) code to
illustrate how this can be done:

(define direction-in    1)
(define direction-out   2)
(define direction-inout 3)

(define (fd->port fd mode) (##open-predefined mode '(fd-port) fd))

(define fd (get-fd-using-ffi!))

(define my-port (fd->port fd direction-inout))

... use my-port like a normal port ...


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