Re: [PATCH] Add current-suspendable-io-status parameter

[Chris Vine]

On Wed, 15 May 2019 12:09:19 +0200
<address@hidden> wrote:
> On Mon, May 13, 2019 at 06:54:38PM +0800, Nala Ginrut wrote:
> > Hi folks!
> > Here's a patch to add current-suspendable-io-status:
> > Its result is a pair: (finished-bytes . rest-bytes)
> 
> Sorry for this possibly dumb question, but... is there a way
> to be non-blocking even if there are no readable/writable
> bytes at all? Or would one have to do multi-threading (and
> let the single threads [1] block) for that?
> 
> Thanks

With guile-2.2/3.0, you install suspendable ports and parameterize
current-read-waiter and/or current-write-waiter.  There is an example
here:
https://github.com/ChrisVine/guile-a-sync2/blob/master/a-sync/await-ports.scm

fibers does something similar.  See also
https://www.gnu.org/software/guile/docs/master/guile.html/Non_002dBlocking-I_002fO.html#Non_002dBlocking-I_002fO

Chris